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2003 Volume 14 Issue 11
2003, 14(11): 1101-1104
Abstract:
Asymmetric hydrogenation of (6-methoxyl-2-naphthyl)-2-acrylic acid catalyzed by cinchona modified Pd(0)-α-FeOOH was reported and ee's of (S)-(+)-2-(6'-methoxyl-2-naphthyl) propionic acid ((S)-(+)-naproxen) up to 98% was achieved firstly.
Asymmetric hydrogenation of (6-methoxyl-2-naphthyl)-2-acrylic acid catalyzed by cinchona modified Pd(0)-α-FeOOH was reported and ee's of (S)-(+)-2-(6'-methoxyl-2-naphthyl) propionic acid ((S)-(+)-naproxen) up to 98% was achieved firstly.
2003, 14(11): 1105-1108
Abstract:
We present an efficient synthetic route towards two kinds of perylene-porphyrin arrays. Starting from 5, 10, 15, 20-meso-tetraphenylporphyrin, two novel 9a and 9b were designed and synthesized with 40.3% and 35.1% yield, respectively.
We present an efficient synthetic route towards two kinds of perylene-porphyrin arrays. Starting from 5, 10, 15, 20-meso-tetraphenylporphyrin, two novel 9a and 9b were designed and synthesized with 40.3% and 35.1% yield, respectively.
2003, 14(11): 1109-1112
Abstract:
A new method of synthesizing single-component molecular conductor[Ni(dmit)2] by the reaction 2(Me4N)[Ni(dmit)2]2→[Ni(dmit)2]+(Me4N)[Ni(dmit)2] is reported.[Ni(dmit)2] exhibits a semiconductive behavior above 167 K, while from 167 K down to the measuring limit of 60 K, it exhibits metallic conductivity.
A new method of synthesizing single-component molecular conductor[Ni(dmit)2] by the reaction 2(Me4N)[Ni(dmit)2]2→[Ni(dmit)2]+(Me4N)[Ni(dmit)2] is reported.[Ni(dmit)2] exhibits a semiconductive behavior above 167 K, while from 167 K down to the measuring limit of 60 K, it exhibits metallic conductivity.
2003, 14(11): 1113-1115
Abstract:
A novel chiral bis(ferrocenyl) P2N ligand 1 with C2-symmetry was synthesized through a four-step procedure from (R)-N,N-dimethyl-1-ferrocenylethylamine. In a model reaction of Pd-catalyzed allylic alkylation of 1,3-diphenylprop-2-enyl acetate 6 with dimethyl malonate, good enantioselectivity (86% e.e.) was obtained.
A novel chiral bis(ferrocenyl) P2N ligand 1 with C2-symmetry was synthesized through a four-step procedure from (R)-N,N-dimethyl-1-ferrocenylethylamine. In a model reaction of Pd-catalyzed allylic alkylation of 1,3-diphenylprop-2-enyl acetate 6 with dimethyl malonate, good enantioselectivity (86% e.e.) was obtained.
2003, 14(11): 1116-1118
Abstract:
The reactions of 2-methylbenzimidazole or 2-methylbenzimidazolium iodide with aromatic aldehydes are accelerated under microwave irradiation by using Ac2O or piperidine as dehydrant or catalyst in the absence of any solvent. The approach provides an attractive and environmentally friendly pathway to several useful styryl dyes with benzimidazole nucleus.
The reactions of 2-methylbenzimidazole or 2-methylbenzimidazolium iodide with aromatic aldehydes are accelerated under microwave irradiation by using Ac2O or piperidine as dehydrant or catalyst in the absence of any solvent. The approach provides an attractive and environmentally friendly pathway to several useful styryl dyes with benzimidazole nucleus.
2003, 14(11): 1119-1122
Abstract:
Five pyridine analogs of the natural product, 3, 5, 4'-trimethoxystilbene, were synthesized. The final compounds were characterized by 1H-NMR.
Five pyridine analogs of the natural product, 3, 5, 4'-trimethoxystilbene, were synthesized. The final compounds were characterized by 1H-NMR.
2003, 14(11): 1123-1126
Abstract:
A novel fulleroaziridine 2 with a closed 6,6-ring junction was synthesized from[60]fullerene and 4-azido-4-deoxy-4'-demethylepipodophyllotoxin 1 in 1, 2-dichlorobenzene at 110℃ for 45 h, in a yield of 39.3% based on consumed C60. The structure of the product was characterized by NMR and MS.
A novel fulleroaziridine 2 with a closed 6,6-ring junction was synthesized from[60]fullerene and 4-azido-4-deoxy-4'-demethylepipodophyllotoxin 1 in 1, 2-dichlorobenzene at 110℃ for 45 h, in a yield of 39.3% based on consumed C60. The structure of the product was characterized by NMR and MS.
2003, 14(11): 1127-1129
Abstract:
A mild two-step method was used to cleave the lactam ring of the tricyclic intermediate 1. A key racemic amino alcohol precursor 5 for the construction of Et-743 skeleton was synthesized from 1 through four steps in total yield of 47%.
A mild two-step method was used to cleave the lactam ring of the tricyclic intermediate 1. A key racemic amino alcohol precursor 5 for the construction of Et-743 skeleton was synthesized from 1 through four steps in total yield of 47%.
2003, 14(11): 1130-1132
Abstract:
The Ugi four-component reaction (U-4CR) was utilized to prepare divalent and trivalent cluster mannosides. Thus, two target compounds 6 and 8 were obtained efficiently using carboxymethyl 2, 3, 4, 6-tetra-O-acetyl-α-D-mannopyranoside 4 as acid component, and 1, 6-hexanediamine or tris(2-aminoethyl)amine as the multivalent scaffolds.
The Ugi four-component reaction (U-4CR) was utilized to prepare divalent and trivalent cluster mannosides. Thus, two target compounds 6 and 8 were obtained efficiently using carboxymethyl 2, 3, 4, 6-tetra-O-acetyl-α-D-mannopyranoside 4 as acid component, and 1, 6-hexanediamine or tris(2-aminoethyl)amine as the multivalent scaffolds.
2003, 14(11): 1133-1134
Abstract:
Epoxide hydrolase-catalyzed resolution of ethyl 3-phenylglydidate was investigated using resting cells of Pseudomonas sp. BZS21. Under the present conditions 26.2% of (2R, 3S)-ethyl 3-phenylglycidate with ee value of 94.6% was obtained from the racemic mixture.
Epoxide hydrolase-catalyzed resolution of ethyl 3-phenylglydidate was investigated using resting cells of Pseudomonas sp. BZS21. Under the present conditions 26.2% of (2R, 3S)-ethyl 3-phenylglycidate with ee value of 94.6% was obtained from the racemic mixture.
2003, 14(11): 1135-1138
Abstract:
Three new chromophores with triphenylamine as molecular focal point bearing one, two, or three 4-(n-butyloxystyryl) group(s) at the periphery respectively, (named as T1, T2, and T3) have been synthesized and characterized. It is interesting to find that the fluorescence quantum yield increases from T1 (0.489), to T3 (0.535), and to T2 (0.628) in cyclohexane, meanwhile the lifetime for T3 is shorter than T1 and T2, which is an important characteristic for applications in light emitting diode. Also PMMA (polymethyl methacrylate) film doped with T3 gives stronger fluorescence than T1, and T2. Cyclic voltammetry showed that T3 exhibited lowest oxidation potential of -0.52 V vs SCE, suggesting its better hole-transport property.
Three new chromophores with triphenylamine as molecular focal point bearing one, two, or three 4-(n-butyloxystyryl) group(s) at the periphery respectively, (named as T1, T2, and T3) have been synthesized and characterized. It is interesting to find that the fluorescence quantum yield increases from T1 (0.489), to T3 (0.535), and to T2 (0.628) in cyclohexane, meanwhile the lifetime for T3 is shorter than T1 and T2, which is an important characteristic for applications in light emitting diode. Also PMMA (polymethyl methacrylate) film doped with T3 gives stronger fluorescence than T1, and T2. Cyclic voltammetry showed that T3 exhibited lowest oxidation potential of -0.52 V vs SCE, suggesting its better hole-transport property.
2003, 14(11): 1139-1140
Abstract:
5,5',6,6'-(2,2'-Bipyridine)tetraacid, a new aza-aromatic tetraacid, was synthesizedstarting from diquinoline, and its structure was confirmed by means of mass spectrum and infrared spectrum.
5,5',6,6'-(2,2'-Bipyridine)tetraacid, a new aza-aromatic tetraacid, was synthesizedstarting from diquinoline, and its structure was confirmed by means of mass spectrum and infrared spectrum.
2003, 14(11): 1141-1143
Abstract:
Two new labdane diterpenes isolated from the rhizomes of Hedychium forrestii were determined by spectroscopic evidence to be labda-8(17), 11, 13-trien-7β-hydroxyl-15(16)-olide (1, hedyforrestin B) and labda-8(17), 11, 13-trien-7β,16-dihydroxyl-16(15)-olide (2, hedyforrestin C).
Two new labdane diterpenes isolated from the rhizomes of Hedychium forrestii were determined by spectroscopic evidence to be labda-8(17), 11, 13-trien-7β-hydroxyl-15(16)-olide (1, hedyforrestin B) and labda-8(17), 11, 13-trien-7β,16-dihydroxyl-16(15)-olide (2, hedyforrestin C).
2003, 14(11): 1144-1145
Abstract:
A new compound, subglain B, was isolated from the stems of Uvaria tonkinensis var. subglabra and its structure was identified as 1S, 2R, 3S, 6R-1-benzoyloxymethylene-1,2-dihydroxy-3-benzoyloxy-6-chlorocyclohex-4-ene (1), by spectral evidences.
A new compound, subglain B, was isolated from the stems of Uvaria tonkinensis var. subglabra and its structure was identified as 1S, 2R, 3S, 6R-1-benzoyloxymethylene-1,2-dihydroxy-3-benzoyloxy-6-chlorocyclohex-4-ene (1), by spectral evidences.
2003, 14(11): 1146-1149
Abstract:
Pepsin-soluble collagen was prepared from bullfrog skin and partially characterized. This study revealed interesting differences, such as molecular weight, amino acid composition, denaturation temperature (Td), in the frog skin collagen when compared to the known vertebrate collagens. This study gives hints that bullfrog skin can be a potential, safe alternative source of collagen from cattle for use in various fields.
Pepsin-soluble collagen was prepared from bullfrog skin and partially characterized. This study revealed interesting differences, such as molecular weight, amino acid composition, denaturation temperature (Td), in the frog skin collagen when compared to the known vertebrate collagens. This study gives hints that bullfrog skin can be a potential, safe alternative source of collagen from cattle for use in various fields.
2003, 14(11): 1150-1153
Abstract:
A novel dimeric coumarin (1), a dimeric of seselin named diseselin A, was isolated from the aerial part of Clausena lenis. The structure was elucidated based on the MS, 1D and 2D NMR data.
A novel dimeric coumarin (1), a dimeric of seselin named diseselin A, was isolated from the aerial part of Clausena lenis. The structure was elucidated based on the MS, 1D and 2D NMR data.
2003, 14(11): 1154-1155
Abstract:
A novel monoterpene glycoside, mileenside, was isolated from Swertia mileensis by repeated normal and reverse phase silica gel chromatography and its structure was elucidated mainly based on spectral evidence.
A novel monoterpene glycoside, mileenside, was isolated from Swertia mileensis by repeated normal and reverse phase silica gel chromatography and its structure was elucidated mainly based on spectral evidence.
2003, 14(11): 1156-1158
Abstract:
Two new sesquiterpene esters, 3β, 6β, 8α-triacetyl-4β, 5α-epoxy-1-oxogermacr-10(14)-ene (1) and 3β, 6β, 8α-triacetyl-4β, 5α-epoxygermacr-1(10)-ene (2) were isolated from the whole plant of Salvia roborowskii Maxim. Their structures were elucidated by means of spectral data (2DNMR and HRMS).
Two new sesquiterpene esters, 3β, 6β, 8α-triacetyl-4β, 5α-epoxy-1-oxogermacr-10(14)-ene (1) and 3β, 6β, 8α-triacetyl-4β, 5α-epoxygermacr-1(10)-ene (2) were isolated from the whole plant of Salvia roborowskii Maxim. Their structures were elucidated by means of spectral data (2DNMR and HRMS).
2003, 14(11): 1159-1162
Abstract:
Ti-Si mixed oxides with different TiO2 content were prepared by sol-gel one step hydrolysis, using TiCl4 as the precursor. The samples were characterized by BET, FT-IR and XRD. The results indicated that titanium is in fourfold coordination with oxygen in the SiO44- in mixed oxides, form the bond of Ti-O-Si, and the low titania materials are mixed on an atomic scale. The phase of anatase appeared when TiO2 content is up to 80%. The mixed oxides had high specific surface areas up to 681.5 m2/g. 10TiSi is a better support than SiO2 in the reaction of CO oxidation.
Ti-Si mixed oxides with different TiO2 content were prepared by sol-gel one step hydrolysis, using TiCl4 as the precursor. The samples were characterized by BET, FT-IR and XRD. The results indicated that titanium is in fourfold coordination with oxygen in the SiO44- in mixed oxides, form the bond of Ti-O-Si, and the low titania materials are mixed on an atomic scale. The phase of anatase appeared when TiO2 content is up to 80%. The mixed oxides had high specific surface areas up to 681.5 m2/g. 10TiSi is a better support than SiO2 in the reaction of CO oxidation.
2003, 14(11): 1163-1166
Abstract:
A simple method to prepare the non-spherical gold particles was developed. The result solution included trigonal, truncated trigonal, hexagonal layers, and a pseudo-pentagonal shaped gold nanocrystals. The key factor is to control the relative rates of nucleation and cluster growth in this method. These attributes make seeding growth method as a useful tool in the fabrication of colloidal metal materials. A longitudinal plasmon resonance of 866 nm was observed, which is in the near-IR spectral regions (600-1000 nm). The excellent optical properties as near-IR labels are used to develop highly sensitive analysis method.
A simple method to prepare the non-spherical gold particles was developed. The result solution included trigonal, truncated trigonal, hexagonal layers, and a pseudo-pentagonal shaped gold nanocrystals. The key factor is to control the relative rates of nucleation and cluster growth in this method. These attributes make seeding growth method as a useful tool in the fabrication of colloidal metal materials. A longitudinal plasmon resonance of 866 nm was observed, which is in the near-IR spectral regions (600-1000 nm). The excellent optical properties as near-IR labels are used to develop highly sensitive analysis method.
2003, 14(11): 1167-1170
Abstract:
Nano-structured SiO2 thin films were prepared on the surface of carbon steel for the first time by LPD. The compositions of the films were analyzed by XPS, and the surface morphology of the thin films were observed by AFM. The thin films were constituted by compact particles of SiO2, and there was no Fe in the films. In the process of film forming, the SiO2 colloid particles were deposited or absorbed directly onto the surface of carbon steel substrates that were activated by acid solution containing inhibitor, and corrosion of the substrates was avoided. The nano-structured SiO2 thin films that were prepared had excellent protective efficiency to the carbon steel.
Nano-structured SiO2 thin films were prepared on the surface of carbon steel for the first time by LPD. The compositions of the films were analyzed by XPS, and the surface morphology of the thin films were observed by AFM. The thin films were constituted by compact particles of SiO2, and there was no Fe in the films. In the process of film forming, the SiO2 colloid particles were deposited or absorbed directly onto the surface of carbon steel substrates that were activated by acid solution containing inhibitor, and corrosion of the substrates was avoided. The nano-structured SiO2 thin films that were prepared had excellent protective efficiency to the carbon steel.
2003, 14(11): 1171-1174
Abstract:
An ordered carbon nanotubes (CNTs) film, which was template-synthesized within the porous of an alumina template, modified glassy carbon electrode is fabricated. The electrode exhibits potent electrocatalysis for NADH oxidation in PBS (pH 6.8) with a diminution of the overpotential of more than 600 mV. The anodic peak current increases linearly with NADH concentration from 2×10-5 mol/L to 1×10-3 mol/L with the detection limit of about 5×10-7 mol/L.
An ordered carbon nanotubes (CNTs) film, which was template-synthesized within the porous of an alumina template, modified glassy carbon electrode is fabricated. The electrode exhibits potent electrocatalysis for NADH oxidation in PBS (pH 6.8) with a diminution of the overpotential of more than 600 mV. The anodic peak current increases linearly with NADH concentration from 2×10-5 mol/L to 1×10-3 mol/L with the detection limit of about 5×10-7 mol/L.
2003, 14(11): 1175-1178
Abstract:
Noodle-like mesoporous silica with a diameter of about 180 nm and a length of ca. 10 μm was prepared through sol-gel process by using poly(sodium 4-styrenesulfonate) (PSS)/cetyltrimethylammonium bromide (CTAB) complex as template. Parallel oriented regular mesopores with a diameter of around 2-4 nm are distributed along the wall of the particles, while the "worm-like" disordered mesopores can be found in the fringe part. This approach provides a new series of templates and a novel route to prepare inorganic mesoporous materials with special morphology.
Noodle-like mesoporous silica with a diameter of about 180 nm and a length of ca. 10 μm was prepared through sol-gel process by using poly(sodium 4-styrenesulfonate) (PSS)/cetyltrimethylammonium bromide (CTAB) complex as template. Parallel oriented regular mesopores with a diameter of around 2-4 nm are distributed along the wall of the particles, while the "worm-like" disordered mesopores can be found in the fringe part. This approach provides a new series of templates and a novel route to prepare inorganic mesoporous materials with special morphology.
2003, 14(11): 1179-1181
Abstract:
A new intercalation compound, Fe0.85PS3(4,4'-bipyH)0.30 (4,4'-bipy=4,4'-bipyridine), is obtained by the intercalation of 4,4'-bipyridine·2HCl with lamellar FePS3, which is characterized by elemental analysis, powder X-ray diffraction, infrared spectroscopy. By comparison with the pure FePS3, the lattice spacing of Fe0.85PS3(4,4'-bipyH)0.30 is expanded by~5.7(Å), indicating that the ring plane of the guest is perpendicular to the layer of the host. The magnetic property of Fe0.85PS3(4,4'-bipyH)0.30 is studied with SQUID. It exhibits an antiferromagnetic phase transition with TN of about 70 K.
A new intercalation compound, Fe0.85PS3(4,4'-bipyH)0.30 (4,4'-bipy=4,4'-bipyridine), is obtained by the intercalation of 4,4'-bipyridine·2HCl with lamellar FePS3, which is characterized by elemental analysis, powder X-ray diffraction, infrared spectroscopy. By comparison with the pure FePS3, the lattice spacing of Fe0.85PS3(4,4'-bipyH)0.30 is expanded by~5.7(Å), indicating that the ring plane of the guest is perpendicular to the layer of the host. The magnetic property of Fe0.85PS3(4,4'-bipyH)0.30 is studied with SQUID. It exhibits an antiferromagnetic phase transition with TN of about 70 K.
2003, 14(11): 1182-1184
Abstract:
The mixed ligand coordination compound of copper with norfloxacin (NFLX) and 1, 10-phen has been synthesized and characterized by means of X-ray single crystal diffraction. The structure features of the coordination compound are described. Antibacterial activities of the coordination compound have been tested against different microorganisms. The antitumor activities of the coordination compound on leukemia HL-60 cell line and liver cancer BEL-7402 cell line have been measured, respectively. The results indicated that the coordination compound has strong inhibitory effect on HL-60 and BEL-7402 cell lines.
The mixed ligand coordination compound of copper with norfloxacin (NFLX) and 1, 10-phen has been synthesized and characterized by means of X-ray single crystal diffraction. The structure features of the coordination compound are described. Antibacterial activities of the coordination compound have been tested against different microorganisms. The antitumor activities of the coordination compound on leukemia HL-60 cell line and liver cancer BEL-7402 cell line have been measured, respectively. The results indicated that the coordination compound has strong inhibitory effect on HL-60 and BEL-7402 cell lines.
2003, 14(11): 1185-1188
Abstract:
A new photoresponsive D-π-A dye, mPS, has been designed and synthesized. Compared to the parent dye PS, IPCE values in the region from 400 nm to 560 nm was greatly improved upon changing the attaching group from the p- position to the o- position of the π-conjugation bridge. A solar cell based on mPS generated a remarkably high overall yield η of 5.4% under irradiation of 80.0 mW cm-2 white light from a Xe lamp. Compared with PS, the overall yield η increased by 64%.
A new photoresponsive D-π-A dye, mPS, has been designed and synthesized. Compared to the parent dye PS, IPCE values in the region from 400 nm to 560 nm was greatly improved upon changing the attaching group from the p- position to the o- position of the π-conjugation bridge. A solar cell based on mPS generated a remarkably high overall yield η of 5.4% under irradiation of 80.0 mW cm-2 white light from a Xe lamp. Compared with PS, the overall yield η increased by 64%.
2003, 14(11): 1189-1192
Abstract:
Based on HYPERCHEM, the structures of five phthalocyanie compounds were optimized with PM3 and their visible absorption maxima were calculated with ZINDO/S method by selecting appropriate π-π overlap weighting factor (OWFπ-π), the agreement with experiment was excellent. The relationship between OWFπ-π and molecular structure parameters was obtained by the method of stepwise regression and was explained in terms of quantum theory. OWFπ-π=0.58126+0.04562ANC1+0.03839X. Where, ANC1 and X are the symbols of average net charges on coordinated bonded nitrogens and electronegativity of central atom, respectively.
Based on HYPERCHEM, the structures of five phthalocyanie compounds were optimized with PM3 and their visible absorption maxima were calculated with ZINDO/S method by selecting appropriate π-π overlap weighting factor (OWFπ-π), the agreement with experiment was excellent. The relationship between OWFπ-π and molecular structure parameters was obtained by the method of stepwise regression and was explained in terms of quantum theory. OWFπ-π=0.58126+0.04562ANC1+0.03839X. Where, ANC1 and X are the symbols of average net charges on coordinated bonded nitrogens and electronegativity of central atom, respectively.
2003, 14(11): 1193-1195
Abstract:
In this paper the embedded zerotree wavelet (EZW) method and Huffman coding are proposed to compress infrared (IR) spectra. We found that this technique is much better than others in terms of efficiently coding wavelet coefficients because the zerotree quantization is an effective way of exploiting the self-similarities of wavelet coefficients at various resolutions.
In this paper the embedded zerotree wavelet (EZW) method and Huffman coding are proposed to compress infrared (IR) spectra. We found that this technique is much better than others in terms of efficiently coding wavelet coefficients because the zerotree quantization is an effective way of exploiting the self-similarities of wavelet coefficients at various resolutions.
2003, 14(11): 1196-1198
Abstract:
Tetra-4['-(2-methylbutoxy)benzoyloxy]phenyl porphyrin[T(MBBP)P] has been synthesized and its solid film has strong CD absorption effect.
Tetra-4['-(2-methylbutoxy)benzoyloxy]phenyl porphyrin[T(MBBP)P] has been synthesized and its solid film has strong CD absorption effect.
2003, 14(11): 1199-1202
Abstract:
Hydrolysis reaction of L-α-dipalmitoylphosphatidylcholine (L-DPPC) monolayer with phospholipase D (PLD) has been investigated by Brewster angle microscopy (BAM) combined with the film balance. It has been found that the L-DPPC domains were changed into the "lotus" structure by PLD. It suggests that the hydrolysis reaction is incomplete and the products together with the nonreacted materials undergo a molecular rearrangement at the interface.
Hydrolysis reaction of L-α-dipalmitoylphosphatidylcholine (L-DPPC) monolayer with phospholipase D (PLD) has been investigated by Brewster angle microscopy (BAM) combined with the film balance. It has been found that the L-DPPC domains were changed into the "lotus" structure by PLD. It suggests that the hydrolysis reaction is incomplete and the products together with the nonreacted materials undergo a molecular rearrangement at the interface.
2003, 14(11): 1203-1206
Abstract:
Trans-4-(N-2-hydroxyethyl-N-ethyl amino)-4'-(diethyl amino)stilbene (DEAHAS) has been synthesized and characterized by 1H NMR, IR and elemental analysis. Linear absorption, single-photon induced fluorescence and two-photon induced fluorescence are experimentally studied. DEAHAS has an effective two-photon absorption cross-sections of σ2=1.19×10-46 cm4·s/photon at 532 nm by using an open aperture Z-scan technique and exhibits a strong two-photon induced blue fluorescence of 430 nm when pumped with 800 nm laser irradiation.
Trans-4-(N-2-hydroxyethyl-N-ethyl amino)-4'-(diethyl amino)stilbene (DEAHAS) has been synthesized and characterized by 1H NMR, IR and elemental analysis. Linear absorption, single-photon induced fluorescence and two-photon induced fluorescence are experimentally studied. DEAHAS has an effective two-photon absorption cross-sections of σ2=1.19×10-46 cm4·s/photon at 532 nm by using an open aperture Z-scan technique and exhibits a strong two-photon induced blue fluorescence of 430 nm when pumped with 800 nm laser irradiation.
2003, 14(11): 1207-1210
Abstract:
The stability constants of the binary complexes of Mn2+ with nicotinamide (NA) were determined from potentiometric pH titrations data at 15.0, 25.0 and 35.0℃ and I=0.1,0.2,0.4 mol L-1 (NaClO4). The formation of binary 1:1, 1:2 NA-Mn complexes at three different temperatures and the influence of three different ionic strength on their stability were reported. The thermodynamic parameters (△Gfo, △Sfo, △Hfo) for the complex formation reaction were estimated from stability constant at different temperatures.
The stability constants of the binary complexes of Mn2+ with nicotinamide (NA) were determined from potentiometric pH titrations data at 15.0, 25.0 and 35.0℃ and I=0.1,0.2,0.4 mol L-1 (NaClO4). The formation of binary 1:1, 1:2 NA-Mn complexes at three different temperatures and the influence of three different ionic strength on their stability were reported. The thermodynamic parameters (△Gfo, △Sfo, △Hfo) for the complex formation reaction were estimated from stability constant at different temperatures.
