摘要:

AbstractThe ternary Cu(II) complex with 2,2′‐bipyridyl (bipy) andL‐methioninate (L‐Met) has been synthesized and characterized by elemental analysis, molar conductivity, UV‐Vis spectra, IR spectra and pH‐potentiometric titration methods. The structure of the complex [Cu(L‐Met) (bipy) (H2O)]ClO4· 3/8H2O was characterized by the X‐ray diffraction analysis. It crystallizes in the triclinic system, space groupP1 with four molecules in a unit cell of dimensions,a= 0.7656(2) nm,b= 1.3142(3) nm,c= 2.0596(4) nm, α = 97.70(3)°, β = 97.96(3)°, γ = 94.33(3)°,V= 2.0244(8) nm3,R1, = 0.0441 andwR2= 0.0678. The crystal contains four crystllographically independent [Cu(L‐Met) (bipy) (H2O)]+complexes (Cu1—Cu4), having a distorted square‐pyramidal geometry with the same coordinated atoms around each copper center. The base plane is occupied by two nitrogen atoms of one bipy, the amino nitrogen atom and one carboxylate oxygen atom from each independent L‐Met moiety, and one water oxygen at an axial position. Cu1 and Cu3 are essentially enantiomers of Cu2 and Cu4. The four molecules are packed with each other by intermolecular hydrogen‐bonding and aro

ISSN:1001-604X    

DOI:10.1002/cjoc.20030210112

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA    

年代:2003

数据来源: WILEY

摘要:

AbstractThe structures of [Cu (S2CN (CH2)4)2] (1) and [Zn2(S2CN‐(CH2)4)4] (2) have been determined by X‐ray crystallography analysis. They are all isomorphous and triclinic, space group ofP1−, with Z = 1. The lattice parameters of compound 1 is:a= 0.63483(2) nm,b= 0.74972(3) nm,c=0.78390(1) mn, α = 75.912(2)°, β = 78.634(2)° and γ = 86.845(2)°; compound 2:a= 0.78707(6) nm,b=0.79823(6) nm,c= 1.23246(9) nm, α = 74.813(2)°, β = 73.048(2)° and γ = 88.036(2)°. The copper atom is located on a crystallographic inversion center and zinc atom lies across centers of symmetry. The Cu(II) ion has a square‐planar geometry while Zn(II) has a distorted tetrahedral geometry. The thermal gravity (TG) data indicate that no structural transitions in the two compounds were abserved and the decomposition products can adsorb gas. Also they all have a hig

ISSN:1001-604X    

DOI:10.1002/cjoc.20030210113

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA    

年代:2003

数据来源: WILEY

摘要:

AbstractIn acidic medium, thorium (IV) can react with a bisazo dye of chromotropic adds such as arsenazo HI (AA in), arsenazo M (AA M), chlorophosphonazo III (CPA III) and chlorosulphonphenol S (CSP S) to form an anionic chelate which further interacts with some proteins to produce a complex. This results in a significant enhancement of intensity of the resonance Rayleigh scattering (RRS) and the appearance of a new RRS spectrum. There are a few obvious RRS peaks in the range of 400–470 nm and the most intensive peak of them is located at 470 nm. The intensity of RRS is directly proportional to the concentration of protein in the range of 0—l.öμg‐mL−1for Th(IV)‐CPA III system, 0–2.8 μg‐mL−1for Th(IV)‐AA M system, 0–2.0 μg·mL−1for Th(IV)‐AA III system and 0–0.28 μg·mL−1for Th(IV)‐CSP S system, respectively. The detection limits for BSA (3s̀) are 10.7 ng·mL−1for Th (IV)‐CPA III, 6.3 ng·mL−1for Th(IV)‐CSP S, 13.6 ng·mL−1for Th(IV)‐AA III and 22.1 ng·mL−1for Th(IV)‐AA M, respectively. This new RRS method has high sensitivity and fairly good selectivity and can be applied to the direct determina

ISSN:1001-604X    

DOI:10.1002/cjoc.20030210114

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA    

年代:2003

数据来源: WILEY

摘要:

AbstractBilayer lipid membranes (BLM) formed from didodecyldimethylammonium bromide were made on the freshly exposed surface of a glassy carbon (GC) and were demonstrated by the ac impedance spectroscopy. The ion channels of membrane properties induced by PF6−were studied by the cyclic voltammetric methods. Experimental results indicated that the ion channel of BLM was open in the presence of the PF6−due to the interaction of PF6−with the BLM, while it was switched off in the absence of PF6−, Because the ion channel behavior was affected by the concentration of PF6−, a sensor for PF6−can b

ISSN:1001-604X    

DOI:10.1002/cjoc.20030210115

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA    

年代:2003

数据来源: WILEY

摘要:

AbstractA new chiral aminophosphine ligand 6,6′‐dimethoxy‐2,2′‐bis(diphenylphosphinoamino) biphenyl (DMBDPPABP) was prepared and its rhodium complex was found to be an effective catalyst for the asymmetric hydrogenation of amidoacrylic add and its derivatives. The effects of solvent and reaction temperature on enantioselectivity were als

ISSN:1001-604X    

DOI:10.1002/cjoc.20030210116

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA    

年代:2003

数据来源: WILEY

摘要:

AbstractThe title compound (1) was treated with NaH at room temperature in anhydrous DMF to give a sodium salt (containing nitrogen anion) which could shin the methyl group from oxygen to nitrogen atom to formN‐methyl phosphinic add as the reaction temperature was increased to 120°C. Three nitro derivatives containing 5,10‐dihydrophenophosphazine ring system were prepared for the investigation on the above reaction mechanism which would be possibly regarded as a special inter‐molecular substitution,viz., the nucleophilic nitrogen anion from one molecule of 1 attacked the carbon atom of theO‐methyl of another 1. In addition, the chemical structures of seven compounds containing 5,10‐dihydrophenophosphazine ring system involved in the experiment were confirmed by IR,1H NMR,31P NMR and mass sp

ISSN:1001-604X    

DOI:10.1002/cjoc.20030210117

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA    

年代:2003

数据来源: WILEY

摘要:

AbstractOrganic nanocrystals of 1,3,5‐triphenyl‐2‐pyrazoline (TPP) with a series of sizes were synthesized by reprecipitation method. The luminescence quantum efficiency of TPP nanocrystals increases from 24.2% for the nanocrystals with an average size of 300 nm to 34.6% for those with an average size of 20 nm. Surface capping by polyvinyl pyrrolidone (PVP) will improve the quantum efficiency of TPP nanocrystals. The size‐dependence and capping‐induced variation of the luminescence quantum efficiency was elucidated in viewpoint of aggregation quenching and the equilibrium between the TPP monomers and the aggregates in TPP nan

ISSN:1001-604X    

DOI:10.1002/cjoc.20030210118

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA    

年代:2003

数据来源: WILEY

摘要:

AbstractTwo new chiral calix[4]arenes bearing chiral pendants, which were from by‐product of the antibiotic industry, were synthesized and characterized by1H NMR, MS‐FAB and elemental analysis. Studies of1H NMR of the two calix[4] arene derivatives indicate that they exist in cone conformation in solution. Results of chiral recognition of the two chiral ligands 2a and 2b towards the tartaric add derivative 3 show that ligand 2a exhibited good chiral recognition abilities compared to ligand

ISSN:1001-604X    

DOI:10.1002/cjoc.20030210119

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA    

年代:2003

数据来源: WILEY

摘要:

AbstractA polysaccharide named as AMP‐1 was isolated from the root ofAtractylodis macrocephalae Koidz, and purified by ethanol fractionation and gel filtration. The homogeneity of AMP‐1 was determined by HPLC and capillary electrophoresis that gave a single peak. AMP‐1 is composed of galactose and mannose in a molar ratio of 1.0:1.9. Its molecular weight is 3.8 × 103. The structure of ghycan was elucidated by IR,1H NMR,13C NMR and methylation analysis, and on the basis of the results was suggested that AMP‐1 contain a backbone of β. (1–2)‐D‐galactose residues with branches of single β‐D‐mannose residue being substituted at theO‐6. Bioactivity assay of AMP‐1 showed that it could inhibit growth of Sarcoma 180 and Lewis pulmonary car

ISSN:1001-604X    

DOI:10.1002/cjoc.20030210120

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA    

年代:2003

数据来源: WILEY

摘要:

AbstractThe viscosity, the shrinkage degree and the photopolymerization rate of the epoxy acrylate (EB600) blended with hyperbranched acrylated aromatic polyester (HAAPE) were investigated. The addition of HAAPE into EB600 largely reduces the viscosity of the blend formulation and the shrinkage degree. For example, EB600 resin with 50% weight fraction of HAAPE has the 1250 cps of the viscosity and 2.0% of shrinkage degree, while the pure EB600 resin has 3000 cps of the viscosity and 10.5% of shrinkage degree. The photopolymerization rate of the resin is also promoted by HAAPE addition. The good miscibility between HAAPE and EB600 was also observed from the dynamic mechanical analysis. The tensile, flexural and compressive strength, and the thermal properties of the UV cured films are greatly improved.

ISSN:1001-604X    

DOI:10.1002/cjoc.20030210121

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA    

年代:2003

数据来源: WILEY