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2005 Volume 16 Issue 12
2005, 16(12): 1563-1565
Abstract:
Novel ionic liquids with dual acidity, of which the cation contains Brønsted acidity and anions contain Lewis acidity were synthesized. These ionic liquids obtained were identified by NMR,FT-IR, SDT and FAB-MS. Their acidities were determined by pyridine probe on IR spectrography.
Novel ionic liquids with dual acidity, of which the cation contains Brønsted acidity and anions contain Lewis acidity were synthesized. These ionic liquids obtained were identified by NMR,FT-IR, SDT and FAB-MS. Their acidities were determined by pyridine probe on IR spectrography.
2005, 16(12): 1566-1568
Abstract:
1-(β-Hydroxyalkyl)-1,3,4-oxadiazole derivatives were synthesized via reductive addition reactions of 2-chloromethyl-1,3,4-oxadiazole with carbonyl compounds under mild condifons promoted by SmI2.
1-(β-Hydroxyalkyl)-1,3,4-oxadiazole derivatives were synthesized via reductive addition reactions of 2-chloromethyl-1,3,4-oxadiazole with carbonyl compounds under mild condifons promoted by SmI2.
2005, 16(12): 1569-1572
Abstract:
Polyhydroxy enyne compound (+)-(1'S, 2R, 3S, 5S, 6S)-5,6-dimethoxy-5, 6-dimethyl-2-(1'-hydroxylpropyl-2-ne)-3-vinyl-1,4-dioxane has been synthesized from D-(-)-tartaric acid. A new chiral center was established by nucleophilic addition with 87% de. The modified Mosher's method was employed to confirm the absolute configuration of 17, which assigned the S-configuration at the new chiral center.
Polyhydroxy enyne compound (+)-(1'S, 2R, 3S, 5S, 6S)-5,6-dimethoxy-5, 6-dimethyl-2-(1'-hydroxylpropyl-2-ne)-3-vinyl-1,4-dioxane has been synthesized from D-(-)-tartaric acid. A new chiral center was established by nucleophilic addition with 87% de. The modified Mosher's method was employed to confirm the absolute configuration of 17, which assigned the S-configuration at the new chiral center.
2005, 16(12): 1573-1576
Abstract:
Tin-indium were employed in the propargylations of various aldehydes with propargyl bromide in the presence of SnCl2 and C6H5(CH3)3NBr under microwave irradiation to afford the corresponding homopropargyl alcohols exclusively in high yields. All the reactions were completed smoothly in predominantly aqueous media in 200 seconds only.
Tin-indium were employed in the propargylations of various aldehydes with propargyl bromide in the presence of SnCl2 and C6H5(CH3)3NBr under microwave irradiation to afford the corresponding homopropargyl alcohols exclusively in high yields. All the reactions were completed smoothly in predominantly aqueous media in 200 seconds only.
2005, 16(12): 1577-1580
Abstract:
Lithium aluminium amide [LiAl(NHR)4]5 obtained by treating the primary amine 4 with UAIH4 could promote the ring opening of epoxide 2 and led to high regioselective product of racemic bis[2-(6-fluoro-2-chromanyl)-2-hydroxyethyl]amine methanesulfonic acid salt 7.
Lithium aluminium amide [LiAl(NHR)4]5 obtained by treating the primary amine 4 with UAIH4 could promote the ring opening of epoxide 2 and led to high regioselective product of racemic bis[2-(6-fluoro-2-chromanyl)-2-hydroxyethyl]amine methanesulfonic acid salt 7.
2005, 16(12): 1581-1583
Abstract:
A new bisbenzofuran analogue Ⅶ was achieved unexpectedly in one step procedure from 1-(4-methoxyphenoxy)acetone I by using Amberlyst 15 resin as catalyst in excellent yield.The structure was elucidated by spectroscopy analysis including 1H-NMR, 13C-NMR, DEPT,ESI-MS, element analysis.
A new bisbenzofuran analogue Ⅶ was achieved unexpectedly in one step procedure from 1-(4-methoxyphenoxy)acetone I by using Amberlyst 15 resin as catalyst in excellent yield.The structure was elucidated by spectroscopy analysis including 1H-NMR, 13C-NMR, DEPT,ESI-MS, element analysis.
2005, 16(12): 1584-1586
Abstract:
A 1:1 reaction of triphenyltin chloride with potassium N-[(3,5-dibromo-2-hydroxyl-phenyl)methylene]valinate in benzene led to the formation of a novel mixed organotin dinuclear complex,(HL)SnPh3·Ph2SnL[L=2-O-3,5-Br2C6H3CH=NCH(i-Pr)COO],by means of a facile phenyl-tin bond cleavage process. In the complex, there are two distinct types of carboxylate moieties and a trans-O2SnC2N and a trans-O2SnC3 in distorted trigonal bipyramidal geometries were bridged by a carboxylate group. In vitro antimmor activity of the complex against three human tumour cell lines (HeLa, CoLo205 and MCF-7) was found to be much higher than cis-platin used in clinic.
A 1:1 reaction of triphenyltin chloride with potassium N-[(3,5-dibromo-2-hydroxyl-phenyl)methylene]valinate in benzene led to the formation of a novel mixed organotin dinuclear complex,(HL)SnPh3·Ph2SnL[L=2-O-3,5-Br2C6H3CH=NCH(i-Pr)COO],by means of a facile phenyl-tin bond cleavage process. In the complex, there are two distinct types of carboxylate moieties and a trans-O2SnC2N and a trans-O2SnC3 in distorted trigonal bipyramidal geometries were bridged by a carboxylate group. In vitro antimmor activity of the complex against three human tumour cell lines (HeLa, CoLo205 and MCF-7) was found to be much higher than cis-platin used in clinic.
2005, 16(12): 1587-1589
Abstract:
The dehydration of 2-(4'-ethylbenzoyl) benzoic acid (BE acid) to 2-ethylanthraquinone(2-EAQ) was investigated over solid acid catalysts. The results showed that H-beta zeolite catalyst modified by dilute HNO3 solution exhibited an excellent performance. In our study, theconversion of BE acid can reach 96.7%, and the selectivity to 2-EAQ is up to 99.6%.
The dehydration of 2-(4'-ethylbenzoyl) benzoic acid (BE acid) to 2-ethylanthraquinone(2-EAQ) was investigated over solid acid catalysts. The results showed that H-beta zeolite catalyst modified by dilute HNO3 solution exhibited an excellent performance. In our study, theconversion of BE acid can reach 96.7%, and the selectivity to 2-EAQ is up to 99.6%.
2005, 16(12): 1590-1592
Abstract:
Reaction of alkanones with 1-butyl-3-methylimidazolium tribromide ([Bmim]Br3) under solvent-free conditions, selectively gave the corresponding α-bromoalkanones with excellentyields.
Reaction of alkanones with 1-butyl-3-methylimidazolium tribromide ([Bmim]Br3) under solvent-free conditions, selectively gave the corresponding α-bromoalkanones with excellentyields.
2005, 16(12): 1593-1596
Abstract:
Treatment of N-alkoxyamides with bis(trifluoroacetoxy)iodobenzene generated electron deficient nitrogen species, which readily cyclized onto aromatic ring to give N-alkoxy-2-oxoindoles. The effect of different substituent on aromatic ring to the electrophilic substitution was studied.
Treatment of N-alkoxyamides with bis(trifluoroacetoxy)iodobenzene generated electron deficient nitrogen species, which readily cyclized onto aromatic ring to give N-alkoxy-2-oxoindoles. The effect of different substituent on aromatic ring to the electrophilic substitution was studied.
2005, 16(12): 1597-1599
Abstract:
A hydrophilic/hydrophobic interpenetrating polymer network (IPN) of poly (vinyl alcohol)/polystyrene was prepared by conversion of the IPN of poly (vinyl acetate)/polystyrene. The hydrophilic/hydrophobic IPN was characterized by FT-IR and DSC, and the swelling ratios of the IPN in different solvents were measured.
A hydrophilic/hydrophobic interpenetrating polymer network (IPN) of poly (vinyl alcohol)/polystyrene was prepared by conversion of the IPN of poly (vinyl acetate)/polystyrene. The hydrophilic/hydrophobic IPN was characterized by FT-IR and DSC, and the swelling ratios of the IPN in different solvents were measured.
2005, 16(12): 1600-1602
Abstract:
A well-defined modiftcation of polytetramethylene glycol (PTMG) was realized by radical grafting with hexafluoropropylene (HFP). The structure of grafted product was confirmed by means of IR, 1H NMR and 13C NMR. The effects of the amount of initiator, reaction time and temperature on the grafting HFP onto PTMG were investigated.
A well-defined modiftcation of polytetramethylene glycol (PTMG) was realized by radical grafting with hexafluoropropylene (HFP). The structure of grafted product was confirmed by means of IR, 1H NMR and 13C NMR. The effects of the amount of initiator, reaction time and temperature on the grafting HFP onto PTMG were investigated.
2005, 16(12): 1603-1606
Abstract:
Two new functional polyacetylenes bearing different azobenzene group, -{HC=C[azo-N(CH3)CH2CH2OH]}n-, [poly(EHAB); azo=4,4'-azobenzene] and -{HC=C[azo-N(CH3)CH2CH2OCOC3H7]}n-, [poly(EEAB)]} were prepared by [Rh(nbd)Cl]2-Et3N catalysts. Poly(EHAB) has poor solubility while poly(EEAB) can be dissolved in common solvent. The polymers were characterized by FTIR, 1H NMR, UV and GPC. The nonlinear optical property of the soluble poly(EEAB) was investigated with 8 ns width pulse at 532 nm by Z-scan technique. The results show that poly(EEAB) is endowed with the larger third-order nonlinear optical property.
Two new functional polyacetylenes bearing different azobenzene group, -{HC=C[azo-N(CH3)CH2CH2OH]}n-, [poly(EHAB); azo=4,4'-azobenzene] and -{HC=C[azo-N(CH3)CH2CH2OCOC3H7]}n-, [poly(EEAB)]} were prepared by [Rh(nbd)Cl]2-Et3N catalysts. Poly(EHAB) has poor solubility while poly(EEAB) can be dissolved in common solvent. The polymers were characterized by FTIR, 1H NMR, UV and GPC. The nonlinear optical property of the soluble poly(EEAB) was investigated with 8 ns width pulse at 532 nm by Z-scan technique. The results show that poly(EEAB) is endowed with the larger third-order nonlinear optical property.
2005, 16(12): 1607-1610
Abstract:
Two new saponins named capilliposide C 1 and capilliposide D 2 were isolated from the whole plants of Lysimachia capillipes, their structures were determined by 1D and 2D NMR, ESIMS techniques, and chemical methods. Capilliposide C showed significant cytotoxic activity against human A2780 cells.
Two new saponins named capilliposide C 1 and capilliposide D 2 were isolated from the whole plants of Lysimachia capillipes, their structures were determined by 1D and 2D NMR, ESIMS techniques, and chemical methods. Capilliposide C showed significant cytotoxic activity against human A2780 cells.
2005, 16(12): 1611-1614
Abstract:
Three naturally new sesquiterpenes named 10-hydroxyepiaplysin, 10-hydroxyaplysin and 10-hydroxybromoepiaplysin have been isolated from Laurencia tristicha. On the basis of the spectroscopic techniques their structures were elucidated as (3S, 3αR, 8βS)-(-)-2, 3, 3α, 8β-tetra-hydro-7-bromo-3-hydroxy-3, 3α, 6,8β-tetramethyl-lH-cyclopenta[b]benzofuran, (3R, 3αR, 8βS)-(-)-2,3,3o, 8β-terahydro-7-bromo-3-hydroxy-3, 3α,6,8β-tetramethyl-1H-cyclopenta[b]benzofuranand (3S, 3αR, 8βS)-(-)-2, 3,3α,8β-tetrahydro-3-hydroxy-3,3α,6,8β-tetramethyl-1H-cyclopenta[b]-benzofuran, respectively.
Three naturally new sesquiterpenes named 10-hydroxyepiaplysin, 10-hydroxyaplysin and 10-hydroxybromoepiaplysin have been isolated from Laurencia tristicha. On the basis of the spectroscopic techniques their structures were elucidated as (3S, 3αR, 8βS)-(-)-2, 3, 3α, 8β-tetra-hydro-7-bromo-3-hydroxy-3, 3α, 6,8β-tetramethyl-lH-cyclopenta[b]benzofuran, (3R, 3αR, 8βS)-(-)-2,3,3o, 8β-terahydro-7-bromo-3-hydroxy-3, 3α,6,8β-tetramethyl-1H-cyclopenta[b]benzofuranand (3S, 3αR, 8βS)-(-)-2, 3,3α,8β-tetrahydro-3-hydroxy-3,3α,6,8β-tetramethyl-1H-cyclopenta[b]-benzofuran, respectively.
2005, 16(12): 1615-1617
Abstract:
Stereumone A, a novel sesquiterpene was isolated from the fermentation broth of Stereum sp. 8954. Its structure was determined to be 5-hydroxy-6,6,9-trimethyl-4,8a-epoxy-2,3,4a,5,6,7,8a,9-octahydro-4H-naphtho[2,3-b]furan-8-one on the basis of the spectral data.
Stereumone A, a novel sesquiterpene was isolated from the fermentation broth of Stereum sp. 8954. Its structure was determined to be 5-hydroxy-6,6,9-trimethyl-4,8a-epoxy-2,3,4a,5,6,7,8a,9-octahydro-4H-naphtho[2,3-b]furan-8-one on the basis of the spectral data.
2005, 16(12): 1618-1620
Abstract:
Two new eremophilane sesquiterpene lactones, lβ-angeloyloxy-6β, 10βdihydroxy-8β-methoxyeremophila-7(11)en-8α,12-olide and 1β-angeloyloxy-6β,10α-dihydroxy-8α-methoxyeremo-phila-7(11)en-8β,12-olide were isolated from the extract of the whole plant of Ligularia myriocephala Ling. Their structures and stereochemistry were elucidated by various spectroscopic methods including intensive 2D-NMR techniques (COSY, gHMQC, gHMBC and 1H-1H NOESY) and HR-ESIMS.
Two new eremophilane sesquiterpene lactones, lβ-angeloyloxy-6β, 10βdihydroxy-8β-methoxyeremophila-7(11)en-8α,12-olide and 1β-angeloyloxy-6β,10α-dihydroxy-8α-methoxyeremo-phila-7(11)en-8β,12-olide were isolated from the extract of the whole plant of Ligularia myriocephala Ling. Their structures and stereochemistry were elucidated by various spectroscopic methods including intensive 2D-NMR techniques (COSY, gHMQC, gHMBC and 1H-1H NOESY) and HR-ESIMS.
2005, 16(12): 1621-1624
Abstract:
echanisms of electron transfer of carbazole (CZ) and 9-ethylcarbazole (ECZ) were studied by electrochemistry and in-situ spectroelectrochemistry. The result indicated that the electrochemical reaction mechanism of ECZ was the same as that of CZ. Both of them undergo ECE process: the initial step is removal of one electron to generate very reactive cation radical, this species then proceeded by deprotonation-coupling reaction to form the corresponding dimer, which was oxidized continuously.
echanisms of electron transfer of carbazole (CZ) and 9-ethylcarbazole (ECZ) were studied by electrochemistry and in-situ spectroelectrochemistry. The result indicated that the electrochemical reaction mechanism of ECZ was the same as that of CZ. Both of them undergo ECE process: the initial step is removal of one electron to generate very reactive cation radical, this species then proceeded by deprotonation-coupling reaction to form the corresponding dimer, which was oxidized continuously.
Application of Nanogoid Probe Coupled with Silver Enhancement in Rapid cTnI Colorimetric Immunoassay
2005, 16(12): 1625-1628
Abstract:
A rapid, inexpensive, reliable, and flexible quantitative immunoassay for cardiac troponin Ⅰ (cTnI) based on the concepts of one-step dual monoclonal antibody "sandwich" principle. The low density protein array, the nanogold probe, and the silver enhancement on the gold particle were provided. The whole detection procedure of the assay could be fulfilled within 40 min with the pretreated colloidal gold-labeled detection antibody and supporting substrate.The assay showed good specific response to cTnI with very low cross-reactivity ratio to the skeletal isoforms of troponin Ⅰ (sTnI), cardiac troponin T (cTnT), and myoglobin. 588 serum samples were assayed simultaneously by enzyme-linked immuno sorbent assay (ELISA) and this colloidal gold method to test the validity of the method and the data were analyzed using the statistical package SPSS version 11.0 (SPSS Inc.). There was no significant difference between these two assays (P=0.66>0.05). The agreement between this method (≥ or <0.3 ng/mL) and ELISA was 86%.
A rapid, inexpensive, reliable, and flexible quantitative immunoassay for cardiac troponin Ⅰ (cTnI) based on the concepts of one-step dual monoclonal antibody "sandwich" principle. The low density protein array, the nanogold probe, and the silver enhancement on the gold particle were provided. The whole detection procedure of the assay could be fulfilled within 40 min with the pretreated colloidal gold-labeled detection antibody and supporting substrate.The assay showed good specific response to cTnI with very low cross-reactivity ratio to the skeletal isoforms of troponin Ⅰ (sTnI), cardiac troponin T (cTnT), and myoglobin. 588 serum samples were assayed simultaneously by enzyme-linked immuno sorbent assay (ELISA) and this colloidal gold method to test the validity of the method and the data were analyzed using the statistical package SPSS version 11.0 (SPSS Inc.). There was no significant difference between these two assays (P=0.66>0.05). The agreement between this method (≥ or <0.3 ng/mL) and ELISA was 86%.
2005, 16(12): 1629-1632
Abstract:
A novel flow-injection irreversible biamperometric method is described for the direct determination of iodide. The method is based on electrochemical oxidation of iodide at the gold electrode and the reduction of permanganate at the platinum electrode to form an irreversible biamperometric detection system. Under the applied potential difference of 0 V, in the 0.05mol/L sulfuric acid, iodide can be determined over the range 4.00×10-7-1.00×10-5 mol/L with a sampling frequency of 120 samples per hour. The detection limit for Ⅰ- is 3.0×10-7 mol/L and the RSD for 40 replicate determinations of 4.0×10-5 mol/L potassium iodide is 1.68%. The new method was applied to the analysis of iodide in table salt with satisfactory results.
A novel flow-injection irreversible biamperometric method is described for the direct determination of iodide. The method is based on electrochemical oxidation of iodide at the gold electrode and the reduction of permanganate at the platinum electrode to form an irreversible biamperometric detection system. Under the applied potential difference of 0 V, in the 0.05mol/L sulfuric acid, iodide can be determined over the range 4.00×10-7-1.00×10-5 mol/L with a sampling frequency of 120 samples per hour. The detection limit for Ⅰ- is 3.0×10-7 mol/L and the RSD for 40 replicate determinations of 4.0×10-5 mol/L potassium iodide is 1.68%. The new method was applied to the analysis of iodide in table salt with satisfactory results.
2005, 16(12): 1633-1636
Abstract:
Metabolism of four tobacco-specific N-nitrosamines (TSNAs), N'-nitrosonornicotine(NNN), N'-nitrosoanatabine (NAT), N'-nitrosoanabasine (NAB) and 4-(methyl nitrosamino)-l-(3-pyridyl)-l-butanone (NNK) was studied by solid-phase extraction (SPE) and liquid chromato-graphy-electrospray ionization-mass spectrometry (LC-ESI-MS). SPE and LC-ESI-MS method was evaluated to be rapid, simple, sensitive and selective for analysis of TSNAs in rabbit serum.The doses of TSNAs administrated were 4.666 μg/kg and 11.665 μg/kg according to different levels in cigarettes. Metabolic curves of four TSNAs and 4-(methyl nitrosamino)-1-(3-pyridyl)-1-butanone (NNAL), the metabolite of NNK, were obtained.
Metabolism of four tobacco-specific N-nitrosamines (TSNAs), N'-nitrosonornicotine(NNN), N'-nitrosoanatabine (NAT), N'-nitrosoanabasine (NAB) and 4-(methyl nitrosamino)-l-(3-pyridyl)-l-butanone (NNK) was studied by solid-phase extraction (SPE) and liquid chromato-graphy-electrospray ionization-mass spectrometry (LC-ESI-MS). SPE and LC-ESI-MS method was evaluated to be rapid, simple, sensitive and selective for analysis of TSNAs in rabbit serum.The doses of TSNAs administrated were 4.666 μg/kg and 11.665 μg/kg according to different levels in cigarettes. Metabolic curves of four TSNAs and 4-(methyl nitrosamino)-1-(3-pyridyl)-1-butanone (NNAL), the metabolite of NNK, were obtained.
2005, 16(12): 1637-1640
Abstract:
The spontaneous condensation of the amphiphilic N-(O,O-dihexadecyl)phosphoryl-alanine on the cast film was observed by in situ investigation of transmission infrared spectroscopy.The particular orientation and ordered packing of the monomers within the multilayers of the cast film is concluded to attribute to the spontaneous condensation between the monomers.
The spontaneous condensation of the amphiphilic N-(O,O-dihexadecyl)phosphoryl-alanine on the cast film was observed by in situ investigation of transmission infrared spectroscopy.The particular orientation and ordered packing of the monomers within the multilayers of the cast film is concluded to attribute to the spontaneous condensation between the monomers.
2005, 16(12): 1641-1644
Abstract:
The effects of oxygen on the chemical structure, morphology, hydrophilicity and drug release behavior of radio-frequency plasma poly n-butyl methacrylate (PPBMA) thin film were carried out for the first time. ATR-FTIR and XPS showed that oxygen had little influence on the chemical structure and composition of PPBMAs, which did not agree with the thought that the presence of oxygen gas would increase the oxidized carbon functionalities in the plasma polymer.SEM and static contact angle measurement indicated that in case of deposition with oxygen, the smoothness and hydrophilicity of PPBMA were dramatically improved. The drug release behavior showed that drug release from the PPBMA coating without oxygen was biphasic patterns,while from PPBMA coating with oxygen was Higuchi release. These results were helpful for the design and tailoring of the PPBMA polymer film and other of plasma polymers film, but could provide a new idea for the drug release controlled form.
The effects of oxygen on the chemical structure, morphology, hydrophilicity and drug release behavior of radio-frequency plasma poly n-butyl methacrylate (PPBMA) thin film were carried out for the first time. ATR-FTIR and XPS showed that oxygen had little influence on the chemical structure and composition of PPBMAs, which did not agree with the thought that the presence of oxygen gas would increase the oxidized carbon functionalities in the plasma polymer.SEM and static contact angle measurement indicated that in case of deposition with oxygen, the smoothness and hydrophilicity of PPBMA were dramatically improved. The drug release behavior showed that drug release from the PPBMA coating without oxygen was biphasic patterns,while from PPBMA coating with oxygen was Higuchi release. These results were helpful for the design and tailoring of the PPBMA polymer film and other of plasma polymers film, but could provide a new idea for the drug release controlled form.
2005, 16(12): 1645-1648
Abstract:
A novel method based on discrete wavelet transform (DWT) and cross-covariance for revealing the evolution of species at different spatial resolutions is presented. The trypsin proteins of different species are chosen as an example to describe the evolution relationship according to the evolution vectors by using this method. The results indicated that this method is a promising approach to reveal species evolution at different spatial resolutions.
A novel method based on discrete wavelet transform (DWT) and cross-covariance for revealing the evolution of species at different spatial resolutions is presented. The trypsin proteins of different species are chosen as an example to describe the evolution relationship according to the evolution vectors by using this method. The results indicated that this method is a promising approach to reveal species evolution at different spatial resolutions.
2005, 16(12): 1649-1651
Abstract:
Detection of ultra trace amount gossypol is reported. It is based on luminol-hexacyanoferrate(Ⅲ) chemiluminescence reaction with gossypol as a sensitizer. The detection limit (3σ)of gossypol reaches 5.21×10-16 mol/L.
Detection of ultra trace amount gossypol is reported. It is based on luminol-hexacyanoferrate(Ⅲ) chemiluminescence reaction with gossypol as a sensitizer. The detection limit (3σ)of gossypol reaches 5.21×10-16 mol/L.
2005, 16(12): 1652-1654
Abstract:
Konjac glucomannan (KGM) was crosslinked with sodium tripolyphosphate (STPP) to synthesize hydrogels. The crosslinking reaction was confirmed by FT-IR. The results of degradation test show that the hydrogels retain the enzymatic degradation character of KGM and can be degraded for 74.45% in 5 days by cellulase E0240.
Konjac glucomannan (KGM) was crosslinked with sodium tripolyphosphate (STPP) to synthesize hydrogels. The crosslinking reaction was confirmed by FT-IR. The results of degradation test show that the hydrogels retain the enzymatic degradation character of KGM and can be degraded for 74.45% in 5 days by cellulase E0240.
2005, 16(12): 1655-1658
Abstract:
A 1D chain-like organic-inorganic hybrid rare earth derivative of polyoxometalate H0.5[Sm(H2O)6]0.25[Sm(H2O)5]0.25{[Sm(H2O)2(DMSO)][SiW11O39]}·4.5H2O has been firstly synthesized by reaction of α-K8SiW11O39·13H2O,HClO4, Sm2O3 with dimethyl sulfoxide (DMSO) and characterized by elemental analysis, IR spectra and single crystal X-ray diffraction.The neighboring polyanionic units {[Sm(H2O)7][Sm(H2O)2(DMSO)][SiW11O39]}2- are bridged together to a 1D chain structure by means of [Sm(H2O)2(DMSO)]3+ ion.
A 1D chain-like organic-inorganic hybrid rare earth derivative of polyoxometalate H0.5[Sm(H2O)6]0.25[Sm(H2O)5]0.25{[Sm(H2O)2(DMSO)][SiW11O39]}·4.5H2O has been firstly synthesized by reaction of α-K8SiW11O39·13H2O,HClO4, Sm2O3 with dimethyl sulfoxide (DMSO) and characterized by elemental analysis, IR spectra and single crystal X-ray diffraction.The neighboring polyanionic units {[Sm(H2O)7][Sm(H2O)2(DMSO)][SiW11O39]}2- are bridged together to a 1D chain structure by means of [Sm(H2O)2(DMSO)]3+ ion.
2005, 16(12): 1659-1662
Abstract:
La(OH)3 nanorods with diameters of 20-40 nm and lengths of 200-300 nm were synthesized by a hydrothermal microemulsion method. The structure and morphology of the final products were characterized by X-ray powder diffraction (XRD), transmission electron microscopy(TEM), and field emission scanning electron microscope (FESEM).
La(OH)3 nanorods with diameters of 20-40 nm and lengths of 200-300 nm were synthesized by a hydrothermal microemulsion method. The structure and morphology of the final products were characterized by X-ray powder diffraction (XRD), transmission electron microscopy(TEM), and field emission scanning electron microscope (FESEM).
2005, 16(12): 1663-1666
Abstract:
A novel artificial site specific cleavage reagent, with peptide nucleic acid (PNA) as sequence-recognizing moiety and cerium (Ⅳ) ions as "scissors" for cleaving target DNA, was synthesized. Subsequently, it was employed in the cleavage of target 26-mer single-stranded DNA (ssDNA), which has 10-mer sequence complementary with PNA recognizer in the hybrids,under physiological conditions. Reversed-phase high-performance liquid chromatogram (RPHPLC) experiments indicated that the artificial site specific cleavage reagent could cleave the target DNA specifically.
A novel artificial site specific cleavage reagent, with peptide nucleic acid (PNA) as sequence-recognizing moiety and cerium (Ⅳ) ions as "scissors" for cleaving target DNA, was synthesized. Subsequently, it was employed in the cleavage of target 26-mer single-stranded DNA (ssDNA), which has 10-mer sequence complementary with PNA recognizer in the hybrids,under physiological conditions. Reversed-phase high-performance liquid chromatogram (RPHPLC) experiments indicated that the artificial site specific cleavage reagent could cleave the target DNA specifically.
2005, 16(12): 1667-1670
Abstract:
This paper proved that octodecyl propylenediamine could form vesicles in pure water and aqueous solution of CuCl2 or Cu(NO3)2. The structure and morphology of vesicles were different when the copper (Ⅱ) salt was added to the solution. The results showed that both the counterions and the ligands had strong influence on the configuration of coordinated structures and packing model in bilayer membrane of vesicles.
This paper proved that octodecyl propylenediamine could form vesicles in pure water and aqueous solution of CuCl2 or Cu(NO3)2. The structure and morphology of vesicles were different when the copper (Ⅱ) salt was added to the solution. The results showed that both the counterions and the ligands had strong influence on the configuration of coordinated structures and packing model in bilayer membrane of vesicles.
2005, 16(12): 1671-1674
Abstract:
The stability constants and species distributions of complexes of two lanthanide ions,Eu(Ⅲ) and Tb(Ⅲ), with a macrocyclic ligand, BDBPH, in 1:1 and 2:1 system, were determined potentiometrically at 25.0℃ and Ⅰ=0.100 mol L-1. The two metal ions could form deprotonated mono-or dinuclear complexes with BDBPH after the first two protons of the ligand completely neutralized. At higher pH values, Eu(Ⅲ) could not form hydroxy complexes with BDBPH, while Tb(Ⅲ) could form hydroxy complexes in the type of M2L(OH), M2L(OH)2, and M2L(OH)3.
The stability constants and species distributions of complexes of two lanthanide ions,Eu(Ⅲ) and Tb(Ⅲ), with a macrocyclic ligand, BDBPH, in 1:1 and 2:1 system, were determined potentiometrically at 25.0℃ and Ⅰ=0.100 mol L-1. The two metal ions could form deprotonated mono-or dinuclear complexes with BDBPH after the first two protons of the ligand completely neutralized. At higher pH values, Eu(Ⅲ) could not form hydroxy complexes with BDBPH, while Tb(Ⅲ) could form hydroxy complexes in the type of M2L(OH), M2L(OH)2, and M2L(OH)3.
