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2007 Volume 18 Issue 12
2007, 18(12): 1431-1435
doi: 10.1016/j.cclet.2007.10.016
Abstract:
An efficient route for the synthesis of 5-(arylpropenylidine)-2, 4, 6-pyrimidinetrione 3 from an appropriate α, β-unsaturated aromatic aldehydes 1 and barbituric acid 2 under both non-catalytic and solvent-free microwave irradiation conditions was described. In this way, a range of biologically important compounds 3 was obtained in good to excellent yields (86-98%) in a very short reaction time (30-80 s).
An efficient route for the synthesis of 5-(arylpropenylidine)-2, 4, 6-pyrimidinetrione 3 from an appropriate α, β-unsaturated aromatic aldehydes 1 and barbituric acid 2 under both non-catalytic and solvent-free microwave irradiation conditions was described. In this way, a range of biologically important compounds 3 was obtained in good to excellent yields (86-98%) in a very short reaction time (30-80 s).
2007, 18(12): 1436-1438
doi: 10.1016/j.cclet.2007.09.039
Abstract:
Bis-silicon-bridged stilbene derivatives were synthesized in a modified procedure that combined the preparation of bis[2-(silyl) phenyl]acetylene and its intrmolecular reductive cyclization in one pot. The results indicated that the one pot approach produced target products in a comparable yield to that of the two-step method reported previously.
Bis-silicon-bridged stilbene derivatives were synthesized in a modified procedure that combined the preparation of bis[2-(silyl) phenyl]acetylene and its intrmolecular reductive cyclization in one pot. The results indicated that the one pot approach produced target products in a comparable yield to that of the two-step method reported previously.
2007, 18(12): 1439-1442
doi: 10.1016/j.cclet.2007.10.027
Abstract:
The novel macrocyclic dilactams with redox-switched disulfide linkage were synthesized. These compounds were obtained from 2, 2'-dithiodibenzoyl chloride in the macrocyclization step by fast addition method in moderate yields.
The novel macrocyclic dilactams with redox-switched disulfide linkage were synthesized. These compounds were obtained from 2, 2'-dithiodibenzoyl chloride in the macrocyclization step by fast addition method in moderate yields.
2007, 18(12): 1443-1446
doi: 10.1016/j.cclet.2007.10.010
Abstract:
A simple method for the oxidative aromatization of Hantzsch 1, 4-dihydropyridines to the corresponding pyridines is achieved by using hydrogen peroxide as green oxidant and acetic acid as catalyst in aqueous solution.
A simple method for the oxidative aromatization of Hantzsch 1, 4-dihydropyridines to the corresponding pyridines is achieved by using hydrogen peroxide as green oxidant and acetic acid as catalyst in aqueous solution.
2007, 18(12): 1447-1450
doi: 10.1016/j.cclet.2007.10.024
Abstract:
Synthesis of symmetrical diaryl sulfoxides from arenes and thionyl chloride in the presence of a catalytic amount of iodine at room temperature under solvent-free conditions is described. Mild reaction conditions, easy workup, high yield, and easily available catalyst are important features of this method.
Synthesis of symmetrical diaryl sulfoxides from arenes and thionyl chloride in the presence of a catalytic amount of iodine at room temperature under solvent-free conditions is described. Mild reaction conditions, easy workup, high yield, and easily available catalyst are important features of this method.
2007, 18(12): 1451-1454
doi: 10.1016/j.cclet.2007.09.003
Abstract:
Oximes were oxidized to the corresponding carbonyl compounds in good to high yields by environmentally friendly and green oxidant, H2O2 catalyzed by montmorillonite K-10 supported cobalt (Ⅱ) chloride.
Oximes were oxidized to the corresponding carbonyl compounds in good to high yields by environmentally friendly and green oxidant, H2O2 catalyzed by montmorillonite K-10 supported cobalt (Ⅱ) chloride.
2007, 18(12): 1455-1459
doi: 10.1016/j.cclet.2007.09.013
Abstract:
The porphyrins tailed with acetylsalicylic acid (ASA) and Zn (or Cu) complexes were prepared. Meanwhile, morphological images, such as shape and size of porphyrins-BSA congeries were observed by using atomic force microscopy (AFM). The result showed the interaction of BSA and prepared porphyrins led to obvious change of shape and size of BSA congeries.
The porphyrins tailed with acetylsalicylic acid (ASA) and Zn (or Cu) complexes were prepared. Meanwhile, morphological images, such as shape and size of porphyrins-BSA congeries were observed by using atomic force microscopy (AFM). The result showed the interaction of BSA and prepared porphyrins led to obvious change of shape and size of BSA congeries.
2007, 18(12): 1460-1462
doi: 10.1016/j.cclet.2007.10.001
Abstract:
Nafion-Teflon bimembrane was used as an efficient support for the preparation and application of heterogeneous palladium catalysts. The supported palladium catalysts exhibit high activity and stability in the Suzuki cross-coupling of aryl bromides with arylboronic acids to afford the corresponding biaryls in good to excellent yields, and can be readily recovered and reused several times without significant loss of activity.
Nafion-Teflon bimembrane was used as an efficient support for the preparation and application of heterogeneous palladium catalysts. The supported palladium catalysts exhibit high activity and stability in the Suzuki cross-coupling of aryl bromides with arylboronic acids to afford the corresponding biaryls in good to excellent yields, and can be readily recovered and reused several times without significant loss of activity.
2007, 18(12): 1463-1465
doi: 10.1016/j.cclet.2007.10.018
Abstract:
Direct reduction of seven benzoic acids to alcohols via sodium borohydride-bromine (NaBH4-Br2) reagent was developed. The isolated yields for the seven acids to reduce reached 60.6-90.1%. This new synthesis route has the advantages of simple of application, low cost, mild nature, and satisfactory yields.
Direct reduction of seven benzoic acids to alcohols via sodium borohydride-bromine (NaBH4-Br2) reagent was developed. The isolated yields for the seven acids to reduce reached 60.6-90.1%. This new synthesis route has the advantages of simple of application, low cost, mild nature, and satisfactory yields.
2007, 18(12): 1466-1468
doi: 10.1016/j.cclet.2007.10.023
Abstract:
A highly efficient synthesis of 2-aryl-quinazolin-4 (3H) ones was performed by one-pot oxidative heterocyclization of 2-aminobenzamide with aldehydes in the presence of potassium permanganate in dimethylacetamide under microwave irradiation.
A highly efficient synthesis of 2-aryl-quinazolin-4 (3H) ones was performed by one-pot oxidative heterocyclization of 2-aminobenzamide with aldehydes in the presence of potassium permanganate in dimethylacetamide under microwave irradiation.
2007, 18(12): 1469-1470
doi: 10.1016/j.cclet.2007.10.019
Abstract:
A practical synthesis of symmetrical vicinal diamines with broad chemistry scope is described. The key step is the ultrasonicwave promoted tandem-reaction, two-step reaction sequence combining Mannich double condensations with benzotriazole, glyoxal and primary or secondary amines and reduction of the bis (benzotriazole)-adducts with sodium borohydride proceeded smoothly in tetrahydrofuran in high yield at room temperature.
A practical synthesis of symmetrical vicinal diamines with broad chemistry scope is described. The key step is the ultrasonicwave promoted tandem-reaction, two-step reaction sequence combining Mannich double condensations with benzotriazole, glyoxal and primary or secondary amines and reduction of the bis (benzotriazole)-adducts with sodium borohydride proceeded smoothly in tetrahydrofuran in high yield at room temperature.
2007, 18(12): 1471-1475
doi: 10.1016/j.cclet.2007.10.009
Abstract:
Photocatalytic oxidation of primary and secondary benzyl alcohol to corresponding benzaldehyde or acetophenone using Acr+ClO4- or PhAcr+ClO4- as photocatalysts under visible light irradiation at room temperature.
Photocatalytic oxidation of primary and secondary benzyl alcohol to corresponding benzaldehyde or acetophenone using Acr+ClO4- or PhAcr+ClO4- as photocatalysts under visible light irradiation at room temperature.
2007, 18(12): 1476-1478
doi: 10.1016/j.cclet.2007.10.022
Abstract:
α-Chlorocycloalkanones (Ⅳ) were synthesized from cycloalkanones via potassium α-oxocycloalkylsulfonates (Ⅱ). A two-step mechanism was proposed to explain the formation of Ⅳ from Ⅱ.
α-Chlorocycloalkanones (Ⅳ) were synthesized from cycloalkanones via potassium α-oxocycloalkylsulfonates (Ⅱ). A two-step mechanism was proposed to explain the formation of Ⅳ from Ⅱ.
2007, 18(12): 1479-1482
doi: 10.1016/j.cclet.2007.10.012
Abstract:
Several 6, 8-dichloroquinolone analogues were synthesized from the key intermediate compound of 2, 3, 4, 5-tetrachlorobenzene carbonyl chloride, which was obtained from the starting material of tetrachlorophthalic anhydride. Their in vitro antibacterial activities were evaluated. As a result of this study, compounds 21c and 21d were twofold more potent than ciprofloxacin (CPFX) and norfloxacin (NFLX) against Staphylococcus aureus-9, and with the same potent as CPFX and NFLX while against Escherichia coli-2, but were less potent than references in against Pseudomonas aeruginosa-17.
Several 6, 8-dichloroquinolone analogues were synthesized from the key intermediate compound of 2, 3, 4, 5-tetrachlorobenzene carbonyl chloride, which was obtained from the starting material of tetrachlorophthalic anhydride. Their in vitro antibacterial activities were evaluated. As a result of this study, compounds 21c and 21d were twofold more potent than ciprofloxacin (CPFX) and norfloxacin (NFLX) against Staphylococcus aureus-9, and with the same potent as CPFX and NFLX while against Escherichia coli-2, but were less potent than references in against Pseudomonas aeruginosa-17.
2007, 18(12): 1483-1486
doi: 10.1016/j.cclet.2007.10.013
Abstract:
Heteropoly acid H3PW12O40 (PW) has been used as an effective catalyst for the synthesis of thieno[2, 3-d]pyrimidin-4 (3H)-one derivatives. The present methodology offers several advantages, such as high yields, short reaction times, mild reaction condition and a recyclable catalyst with a very easy work up.
Heteropoly acid H3PW12O40 (PW) has been used as an effective catalyst for the synthesis of thieno[2, 3-d]pyrimidin-4 (3H)-one derivatives. The present methodology offers several advantages, such as high yields, short reaction times, mild reaction condition and a recyclable catalyst with a very easy work up.
2007, 18(12): 1487-1489
doi: 10.1016/j.cclet.2007.10.014
Abstract:
New Fréchet-type dendritic BINOL ligands bearing several BINOL units at the periphery have been successfully synthesized. The (dendritic BINOL) Ti (Ⅳ) complexes were proved to be efficient catalysts for the enantioselective addition of diethylzinc to aromatic aldehydes. Moreover, these ligands could be quantitatively recovered and reused at least five times without a loss of the yield and enantioselectivity.
New Fréchet-type dendritic BINOL ligands bearing several BINOL units at the periphery have been successfully synthesized. The (dendritic BINOL) Ti (Ⅳ) complexes were proved to be efficient catalysts for the enantioselective addition of diethylzinc to aromatic aldehydes. Moreover, these ligands could be quantitatively recovered and reused at least five times without a loss of the yield and enantioselectivity.
2007, 18(12): 1490-1492
doi: 10.1016/j.cclet.2007.10.030
Abstract:
A good strategy was brought forward for designing efficient haptens and complete antigens for 3-amino-2-oxazolidinone (AOZ). Haptens designed newly were achieved facilely in good yield by using LiCl-N (Et)3 as new catalysis system, the structure of which was elucidated by spectroscopy analysis, such as NMR and MS. Novel antigens for AOZ were prepared successfully by convenient ester method. The ratios of haptens 3 and 4 to carrier proteins were proven respectively as 41:1 (5a), 39:1 (6a), 11:1 (5b) and 9:1 (6b) by trinitrobenzene sulfonic acid (TNBS) method. The results of indirect competitive ELISA (ic-ELISA) of antiserums indicated that the haptens with a short unsaturated side chain can evoke specific immune response effectively.
A good strategy was brought forward for designing efficient haptens and complete antigens for 3-amino-2-oxazolidinone (AOZ). Haptens designed newly were achieved facilely in good yield by using LiCl-N (Et)3 as new catalysis system, the structure of which was elucidated by spectroscopy analysis, such as NMR and MS. Novel antigens for AOZ were prepared successfully by convenient ester method. The ratios of haptens 3 and 4 to carrier proteins were proven respectively as 41:1 (5a), 39:1 (6a), 11:1 (5b) and 9:1 (6b) by trinitrobenzene sulfonic acid (TNBS) method. The results of indirect competitive ELISA (ic-ELISA) of antiserums indicated that the haptens with a short unsaturated side chain can evoke specific immune response effectively.
2007, 18(12): 1493-1495
doi: 10.1016/j.cclet.2007.10.015
Abstract:
A novel series of N-alkylphthalimidylaminocarbonylmethoxylcalix[4]arenes with the reaction between 4-(N-bromoacetylamino)-phthalimide derivatives and calix[4]arene has been synthesized and structurally characterized by IR, 1H NMR and MS. From their analysis data, it was found that compounds 7a-7d adopted a cone conformation.
A novel series of N-alkylphthalimidylaminocarbonylmethoxylcalix[4]arenes with the reaction between 4-(N-bromoacetylamino)-phthalimide derivatives and calix[4]arene has been synthesized and structurally characterized by IR, 1H NMR and MS. From their analysis data, it was found that compounds 7a-7d adopted a cone conformation.
2007, 18(12): 1496-1500
doi: 10.1016/j.cclet.2007.10.005
Abstract:
A series of novel fluorene-carbazole-based copolymers with pyrazoline and benzothiazole units were synthesized successfully through Suzuki coupling reactions. The molecular structures and thermal properties of these polymers were characterized by FT-IR, 1H NMR, DSC and TGA. GPC results indicated that the weight-average molecular weight (Mw) and polydispersity of these polymers were in range (12, 000-14, 000) and (1.8-2.0), respectively. The two resulting polymers have high photoluminescence quantum efficiency implying that they may be promising candidates for polymer light-emitting diodes (PLEDs).
A series of novel fluorene-carbazole-based copolymers with pyrazoline and benzothiazole units were synthesized successfully through Suzuki coupling reactions. The molecular structures and thermal properties of these polymers were characterized by FT-IR, 1H NMR, DSC and TGA. GPC results indicated that the weight-average molecular weight (Mw) and polydispersity of these polymers were in range (12, 000-14, 000) and (1.8-2.0), respectively. The two resulting polymers have high photoluminescence quantum efficiency implying that they may be promising candidates for polymer light-emitting diodes (PLEDs).
2007, 18(12): 1501-1504
doi: 10.1016/j.cclet.2007.10.003
Abstract:
A new 1, 3, 4-oxadiazole-contanining rhenium (Ⅰ) complex, with the formula[Re (CO)3 (Bphen)(PTOP)], (Bphen=bathophenardine, PTOP=4-(5-p-tolyl-1, 3, 4-oxadiazd-2-yl) pyridine), is synthesized and characterized by elemental analysis, IR, 1H NMR, UV-vis and luminescence spectroscopy. The double-layer electroluminescence devices based on the Re (Ⅰ) complex have been fabricated by spin-coating technique. The turn-on voltage, maximum efficiency, and brightness for green emission obtained from the devices are 9 V, 2.1 cd/A and 165 cd/m2, respectively.
A new 1, 3, 4-oxadiazole-contanining rhenium (Ⅰ) complex, with the formula[Re (CO)3 (Bphen)(PTOP)], (Bphen=bathophenardine, PTOP=4-(5-p-tolyl-1, 3, 4-oxadiazd-2-yl) pyridine), is synthesized and characterized by elemental analysis, IR, 1H NMR, UV-vis and luminescence spectroscopy. The double-layer electroluminescence devices based on the Re (Ⅰ) complex have been fabricated by spin-coating technique. The turn-on voltage, maximum efficiency, and brightness for green emission obtained from the devices are 9 V, 2.1 cd/A and 165 cd/m2, respectively.
2007, 18(12): 1505-1508
doi: 10.1016/j.cclet.2007.10.004
Abstract:
A convenient synthesis and theoretical study of five CCK-functional dendrimers is described. The dendritic cores were linked with the CCK (Trp-Met-Asp (OBn)-PheNH2) fragment by forming amide bonds to give five target molecules. The structures of CCK-functional dendrimers were characterized by NMR, MS spectrum and predicted using molecular mechanics and PM3 semiempirical molecular orbital theory.
A convenient synthesis and theoretical study of five CCK-functional dendrimers is described. The dendritic cores were linked with the CCK (Trp-Met-Asp (OBn)-PheNH2) fragment by forming amide bonds to give five target molecules. The structures of CCK-functional dendrimers were characterized by NMR, MS spectrum and predicted using molecular mechanics and PM3 semiempirical molecular orbital theory.
2007, 18(12): 1509-1511
doi: 10.1016/j.cclet.2007.10.017
Abstract:
Two new epimeric pairs of iridoid scyphiphin A1 (1a), A2 (1b) and scyphiphin B1 (2a), B2 (2b) were isolated from Scyphiphora hydrophyllacea Gaertn. F. Their structures were elucidated by spectroscopic methods. The mixture of scyphiphin B1 and scyphiphin B2 showed moderate cytotoxicity against human hepatoma SMMC-7721 cell line in vitro by MTT method.
Two new epimeric pairs of iridoid scyphiphin A1 (1a), A2 (1b) and scyphiphin B1 (2a), B2 (2b) were isolated from Scyphiphora hydrophyllacea Gaertn. F. Their structures were elucidated by spectroscopic methods. The mixture of scyphiphin B1 and scyphiphin B2 showed moderate cytotoxicity against human hepatoma SMMC-7721 cell line in vitro by MTT method.
2007, 18(12): 1512-1514
doi: 10.1016/j.cclet.2007.10.020
Abstract:
A new iridoid was isolated from the 80% ethanol extract of the whole plant of Incarvillea delavayi. Its structure was defined, and named incarvillic acid, on the basis of spectral evidences.
A new iridoid was isolated from the 80% ethanol extract of the whole plant of Incarvillea delavayi. Its structure was defined, and named incarvillic acid, on the basis of spectral evidences.
2007, 18(12): 1515-1517
doi: 10.1016/j.cclet.2007.10.021
Abstract:
Two new compounds, lethaclado acid A (1) and B (2), were isolated from the acetone extract of Lethariella cladonioides. Their structures were elucidated on the basis of 1D and 2D NMR as well as ESI-MS spectral data.
Two new compounds, lethaclado acid A (1) and B (2), were isolated from the acetone extract of Lethariella cladonioides. Their structures were elucidated on the basis of 1D and 2D NMR as well as ESI-MS spectral data.
2007, 18(12): 1518-1520
doi: 10.1016/j.cclet.2007.10.028
Abstract:
Two new megastigmane O-glucopyranosides, named (2R, 3R, 5R, 6S, 9R)-3-hydroxy-5, 6-epoxy-β-ionol-2-O-β-D-glucopyranoside (1) and (2R, 3R, 5R, 6S, 9R)-3-hydroxyl-5, 6-epoxy-acety-β-onol-2-O-β-D-glucopyranoside (2) together with six known megastigmanes, were isolated from the leaves of Broussonetia papyrifera (Linn. ) Vent. Their structures were established by chemical methods and spectroscopic techniques including 2D NMR.
Two new megastigmane O-glucopyranosides, named (2R, 3R, 5R, 6S, 9R)-3-hydroxy-5, 6-epoxy-β-ionol-2-O-β-D-glucopyranoside (1) and (2R, 3R, 5R, 6S, 9R)-3-hydroxyl-5, 6-epoxy-acety-β-onol-2-O-β-D-glucopyranoside (2) together with six known megastigmanes, were isolated from the leaves of Broussonetia papyrifera (Linn. ) Vent. Their structures were established by chemical methods and spectroscopic techniques including 2D NMR.
2007, 18(12): 1521-1524
doi: 10.1016/j.cclet.2007.10.008
Abstract:
AgSt/AgCl composite grains were prepared by adding chloride ions to a mixed solvent in which silver stearate (AgSt) grains were dispersed under the condition of controlled pH value and characterized by SEM, XRD, UV and DSC. The results showed that AgSt/AgCl composite grains were composed of plate-like AgSt grains with small face-centered cubic AgCl particles formed on the surface of AgSt. UV spectra displayed a red shift of absorption for AgSt/AgCl relative to pure AgSt or AgCl. DSC showed a new thermal phase transition of AgSt/AgCl grains.
AgSt/AgCl composite grains were prepared by adding chloride ions to a mixed solvent in which silver stearate (AgSt) grains were dispersed under the condition of controlled pH value and characterized by SEM, XRD, UV and DSC. The results showed that AgSt/AgCl composite grains were composed of plate-like AgSt grains with small face-centered cubic AgCl particles formed on the surface of AgSt. UV spectra displayed a red shift of absorption for AgSt/AgCl relative to pure AgSt or AgCl. DSC showed a new thermal phase transition of AgSt/AgCl grains.
2007, 18(12): 1525-1527
doi: 10.1016/j.cclet.2007.09.033
Abstract:
Offwhite pure Fe2P2O7 was synthesized through solid phase reaction using Fe2O3 and NH4H2PO4 in argon atmosphere. The reaction products of Fe2O3 and NH4H2PO4 at a series of temperatures from 400 to 900℃ were characterized by XRD. Comparison and analysis of XRD patterns of resultant products indicated well-crystallized Fe2P2O7 could be obtained over 630℃ and Fe2P2O7 prepared at 700℃ was triclinic in cell type. Comparison of the cell parameters proved that the as-prepared Fe2P2O7 belonged to β-Fe2P2O7 in crystal phase and SEM showed its size distribution was 0.5-2 μm.
Offwhite pure Fe2P2O7 was synthesized through solid phase reaction using Fe2O3 and NH4H2PO4 in argon atmosphere. The reaction products of Fe2O3 and NH4H2PO4 at a series of temperatures from 400 to 900℃ were characterized by XRD. Comparison and analysis of XRD patterns of resultant products indicated well-crystallized Fe2P2O7 could be obtained over 630℃ and Fe2P2O7 prepared at 700℃ was triclinic in cell type. Comparison of the cell parameters proved that the as-prepared Fe2P2O7 belonged to β-Fe2P2O7 in crystal phase and SEM showed its size distribution was 0.5-2 μm.
2007, 18(12): 1528-1530
doi: 10.1016/j.cclet.2007.09.009
Abstract:
Amphiphilic block copolymers of poly (5-benzyloxy trimethylene carbonate)(PBTMC) and poly (ethylene glycol)(PEG) were synthesized through enzymatic polymerization using immobilized porcine pancreas lipase (IPPL). The obtained copolymers with different compositions were characterized by GPC and 1H NMR. The copolymer composition was in agreement with the feed ratio. The molecular weight of the copolymers showed an increasing trend with the decrease of PEG contents. Micelles of the copolymers were formed by dialysis procedure, and characterized by transmission electron microscopy (TEM).
Amphiphilic block copolymers of poly (5-benzyloxy trimethylene carbonate)(PBTMC) and poly (ethylene glycol)(PEG) were synthesized through enzymatic polymerization using immobilized porcine pancreas lipase (IPPL). The obtained copolymers with different compositions were characterized by GPC and 1H NMR. The copolymer composition was in agreement with the feed ratio. The molecular weight of the copolymers showed an increasing trend with the decrease of PEG contents. Micelles of the copolymers were formed by dialysis procedure, and characterized by transmission electron microscopy (TEM).
2007, 18(12): 1531-1534
doi: 10.1016/j.cclet.2007.09.037
Abstract:
Novel conjugated polymers based on squaric acid having 2, 5-Bis[(E)-N-alkylpyrrol-2-ylvinyl]-3-alkylthiophene (PVTVP) unit in the main chain were successfully synthesized in good yields through polycondensation reaction. Their molecular structures were characterized by FT-IR and 1H NMR. They have good solubility in common organic solvents, good thermal stability by thermal gravimetric analysis and high molecular weights. Their optical properties were investigated by UV-vis absorption spectra in CH2Cl2 solution, the results indicated all these compounds showed broad and strong spectral responses from 200 nm to 900 nm, suggesting their potential for application as organic plastic solar cells.
Novel conjugated polymers based on squaric acid having 2, 5-Bis[(E)-N-alkylpyrrol-2-ylvinyl]-3-alkylthiophene (PVTVP) unit in the main chain were successfully synthesized in good yields through polycondensation reaction. Their molecular structures were characterized by FT-IR and 1H NMR. They have good solubility in common organic solvents, good thermal stability by thermal gravimetric analysis and high molecular weights. Their optical properties were investigated by UV-vis absorption spectra in CH2Cl2 solution, the results indicated all these compounds showed broad and strong spectral responses from 200 nm to 900 nm, suggesting their potential for application as organic plastic solar cells.
2007, 18(12): 1535-1538
doi: 10.1016/j.cclet.2007.10.029
Abstract:
High selective molecularly imprinted polymers (MIPs) for tetracycline have been prepared by precipitation polymerization. Effects of monomer and solvent, the ratio of monomer and template and the characterization of the polymer were investigated by frontal chromatography and selectivity experiment. The results clearly indicated that the polymer, which had the highest molecular recognition abilities for tetracycline antibiotics, had been received.
High selective molecularly imprinted polymers (MIPs) for tetracycline have been prepared by precipitation polymerization. Effects of monomer and solvent, the ratio of monomer and template and the characterization of the polymer were investigated by frontal chromatography and selectivity experiment. The results clearly indicated that the polymer, which had the highest molecular recognition abilities for tetracycline antibiotics, had been received.
2007, 18(12): 1539-1542
doi: 10.1016/j.cclet.2007.10.026
Abstract:
A novel 3D coordination compound of K (H2TDA)(H2O)(1)(H3TDA=1H-1, 2, 3-triazole-4, 5-dicarboxylic acid) has been prepared and characterized by IR spectroscopy, elemental analysis, ICP and single-crystal X-ray diffraction. Compound 1 displays strong fluorescent emission at room temperature.
A novel 3D coordination compound of K (H2TDA)(H2O)(1)(H3TDA=1H-1, 2, 3-triazole-4, 5-dicarboxylic acid) has been prepared and characterized by IR spectroscopy, elemental analysis, ICP and single-crystal X-ray diffraction. Compound 1 displays strong fluorescent emission at room temperature.
2007, 18(12): 1543-1547
doi: 10.1016/j.cclet.2007.10.007
Abstract:
2, 4-Dichlorophenol was removed from wasterwater using a new hydrophobic poly (phthalazinone ether sulfone ketone)(PPESK) hollow fiber membrane by vacuum membrane distillation (VMD).
2, 4-Dichlorophenol was removed from wasterwater using a new hydrophobic poly (phthalazinone ether sulfone ketone)(PPESK) hollow fiber membrane by vacuum membrane distillation (VMD).
2007, 18(12): 1548-1550
doi: 10.1016/j.cclet.2007.10.025
Abstract:
A supramolecular hydrogel (defined as G1) formed from 1, 2, 4, 5-benzene tetracarboxylic acid (BTCA) and 2-amino-3-hydroxypyridine possessed higher Tgel than that of another hydrogel (defined as G2) formed from BTCA and 3-hydroxypyridine. Based on the analysis of their xerogels by 1H NMR, IR and XRD, the higher stability of G1 was attributed to the formation of stronger hydrogen binding enhanced by the ortho amino group of 2-amino-3-hydroxypyridine.
A supramolecular hydrogel (defined as G1) formed from 1, 2, 4, 5-benzene tetracarboxylic acid (BTCA) and 2-amino-3-hydroxypyridine possessed higher Tgel than that of another hydrogel (defined as G2) formed from BTCA and 3-hydroxypyridine. Based on the analysis of their xerogels by 1H NMR, IR and XRD, the higher stability of G1 was attributed to the formation of stronger hydrogen binding enhanced by the ortho amino group of 2-amino-3-hydroxypyridine.
2007, 18(12): 1551-1553
doi: 10.1016/j.cclet.2007.10.006
Abstract:
The positively charged single walled carbon nanotubes (SWNTs+) were prepared by conjugating with-CONH-C6H12-NH3+. The double strand DNA (dsDNA) chains were loaded onto SWNTs+ via the electrostatic interactions. SWNTs+ shows improved loading efficiency (353.5 μg/mg) toward dsDNA compared with that of charged free single walled carbon nanotubes (SWNTs)(82.9 μg/mg).
The positively charged single walled carbon nanotubes (SWNTs+) were prepared by conjugating with-CONH-C6H12-NH3+. The double strand DNA (dsDNA) chains were loaded onto SWNTs+ via the electrostatic interactions. SWNTs+ shows improved loading efficiency (353.5 μg/mg) toward dsDNA compared with that of charged free single walled carbon nanotubes (SWNTs)(82.9 μg/mg).
2007, 18(12): 1554-1556
doi: 10.1016/j.cclet.2007.07.029
Abstract:
Molecular dynamics simulation studies on crambin, BPTI (298 K, in vacuo) have been performed by ABEEM/MM method. Some structural properties were discussed. The results show fair consistency with those from X-ray experiment. Moreover, ABEEM/MM model can properly describe the interactions of hydrogen bond of protein systems.
Molecular dynamics simulation studies on crambin, BPTI (298 K, in vacuo) have been performed by ABEEM/MM method. Some structural properties were discussed. The results show fair consistency with those from X-ray experiment. Moreover, ABEEM/MM model can properly describe the interactions of hydrogen bond of protein systems.
