摘要:

AbstractA new method is described for the electroless deposition of copper onto glass. Commercially available glass slide was modified with μ‐amimopropyltrimethoxysilane to form self‐assembled monolayer (SAM) on it. Then it was dipped directly into PdCl2solution instead of the conventional SnCl2sensitization followed by PdCl2activation. Experimental results showed that the Pd2+ions from PdCl2solution were coordinated to the ammo groups on the glass surface resulting in the formation of N—Pd complex. In an electroless copper bath containing a formaldehyde reducing agent, the N—Pd complexes were reduced to Pd0atoms, which then acted as catalysts and initiated the deposition of copper metal. Although the copper deposition rate on SAM‐modified glass was slow at the beginning, it reached to that of conventional method in a

ISSN:1001-604X    

DOI:10.1002/cjoc.20030210102

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

年代:2003

数据来源: WILEY

摘要:

AbstractEnzymatic alcoholysis has been developed for the preparation of some chiral 1‐ and 2‐hydroxyalkanephosphonates with high optical purity. This method ensures the convenient access to the optically pure phosphocarnitine, phosphogabob and phosphomy

ISSN:1001-604X    

DOI:10.1002/cjoc.20030210103

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

年代:2003

数据来源: WILEY

摘要:

AbstractAn efficient liquid‐phase synthesis of isoxazolines through a 1,3‐dipolar cycloaddition is described. Soluble polymer‐supported acrylate reacted with nitrile oxides generatedin‐situ, followed by cleavage from the support giving corresponding isoxazolines in high yields and excellent p

ISSN:1001-604X    

DOI:10.1002/cjoc.20030210104

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

年代:2003

数据来源: WILEY

摘要:

AbstractThe second‐order nonlinear optical (NLO) properties of a series of benzothiazole derivatives were studied by use of the ZINDO‐SOS method. These chromophores are formed by a donor‐π‐bridge‐acceptor system, based on a nitro group connected with benzothiazole as the acceptor and a hydroxyl‐functional amino group as the donor. For the purpose of comparison, we also designed molecules in which nitrobenzene is an acceptor. The calculation results indicate that benzothiazole derivatives exhibit larger second‐order polarizabilities than nitrobenzene derivatives. In order to clarify the origin of the NLO response of these chromophores, their electron properties were investigated as well. The benzothiazole derivatives are good candidates for application in electro‐optical device due to their high optical nonlinearities, good thermal and ph

ISSN:1001-604X    

DOI:10.1002/cjoc.20030210105

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

年代:2003

数据来源: WILEY

摘要:

AbstractThe oxidative splitting process ofcis‐syn1,3‐dimethyluracil cyclobutane dimer (DMUD) in aqueous solution was investigated using pulse radiolysis technique. The results indicated that DMUD can be splitted into 1,3‐dimethyluracil (DMU) by OH radicals (OH·) and Br2radical anions (Br·2−), but not by azide radicals (N·3). The oxidative mechanisms that an H‐abstracted from DMUD for OH·oxidative splitting and an electron transfer from DMUD to Br·2−, were suggested. Related kinetic parameters

ISSN:1001-604X    

DOI:10.1002/cjoc.20030210106

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

年代:2003

数据来源: WILEY

摘要:

AbstractComparative molecular field analysis (CoMFA), a three dimensional quantitative structure‐activity relationship (3D‐QSAR) method was applied to a series of diindolylmethane (DIM) analogs to study the relationship between their structure and their induction of CYP 1A1‐associated ethoxyresorufin‐O‐deethylase (EROD) activity. A DISCO model of pharmacophore was derived to guide the superposition of the compounds. The coefficient of cross‐validation (q2) and non cross‐validation (r2) for the model established by the study are 0.827 and 0.988 respectively, the value of variance ratio (F) is 103.53 and standard error estimate (SEE) is 0.044. These values indicate that the CoMFA model derived is significant and might have a good prediction for the catalytic activity of DIM compounds. As a consequence, the predicted activity values of new designed compounds were all higher than that of the r

ISSN:1001-604X    

DOI:10.1002/cjoc.20030210107

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

年代:2003

数据来源: WILEY

摘要:

AbstractThe three‐phase behavior in the quaternary system ofn‐dodecyl polyglucoside C12G1.46/1‐butanol/cyclohexane/water has been studied at 40°C in terms of the variables γ and δ. Increasing δ at constant γ causes a phase inversion from an oil‐in‐water microemulsion in contact with excess oil (winsor I or 2) to a water‐in‐oil microemulsion in contact with excess water (winsor II or 2−) via a middle‐phase microemulsion in contact with excess oil and water (winsor III or 3). By taking into account the different solubilities of alkyl polyglucoside and 1‐butanol in the oil phase, the composition of the hydrophile‐lipophile balanced interfacial film in the middle of the three‐phase body can be calculated. The effects of different oils and aqueous media on the phase behavior and on the composition of the interfacial film and the efficiency for alkyl polyglucoside to make equal weights of water and oil to a single phase were investigated. It was found that the oil molecules with small molecular volumes can improve the solubilizing efficiency of the surfactant to form single‐phase microemulsion. In inorganic salt (NaCl) and add (HCl) solutions, less 1‐butanol is needed than that in alkali (NaOH) solution to

ISSN:1001-604X    

DOI:10.1002/cjoc.20030210108

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

年代:2003

数据来源: WILEY

摘要:

AbstractPotential energy surface of HNOS system is investigated by means of MP2 method with 6–311 ++ G(d, p) basis set. The energy for each minimum and saddle point on the potential energy surface is corrected at the QCISD(T)/6–311 ++ G(3df, 2p) level of theory with zero‐point vibrational energy included. As a result, eighteen isomers are theoretically predicted andcis‐HNSO is found to be global minimum on the potential energy surface. Wherein, fourteen isomers are considered as kinetically stable species, and should be experimentally observed. Comparisons are made for HNOS system with its analogues, HNO2and HNS2. The nature of bonding and isomers'stability of HNOS system are similar to HNS2. The obvious similarities and discrepancies among HNOS, HNO2and HNS2are attributed to the hypervalent capacity of sulfur, oxygen and nitroge

ISSN:1001-604X    

DOI:10.1002/cjoc.20030210109

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

年代:2003

数据来源: WILEY

摘要:

AbstractIt has been found that the two‐phase reactions of aqueous HCl, HOAc or H3PO4with primary amine N1923in chloroform are oscillating reactions. Their power‐time curves were measured by the titration microcalorimetric method, and the induction period (tta). The first oscillating period (tp.1) and the second oscillating period (tp.2) were determined. The apparent activating parameters and the orders of the oscillating systems were calculated and the following relationships were established: for the oscillating system of hydrochloric acid tin∞ c0.147HCIexp(1.35 × 103/T), tp.1∞ c0.241HCI, exp(4.33 × 103/T), tp.2∞ c0.290HCIexp(5.59 × 103/T); for the oscillating system of acetic acid, tin∞ c0.883HOAcexp(2.32 × 103/T), tp.1∞ c0.399BOAc, exp(4.50 × 103/T), tp.2∞ c0.301HOAcexp(5.88 × 103/T); for the oscillating system of phosphoric acid, tin∞ c1.14 H 3PO 4exp(7.70 × 104), tp.1∞ c1.42 H 3PO 4exp (1.14 × 104/T

ISSN:1001-604X    

DOI:10.1002/cjoc.20030210110

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

年代:2003

数据来源: WILEY

摘要:

AbstractA Cupro‐8‐thioqinoline coordination polymer, [CuI(C9H6NS)]n, was synthesized by methano‐thermal reaction of CuCl and 8,8′‐dithiodiquinoline (dtdq) in a molar ratio of 2:1 at 160°C for 7 d. X‐Ray single crystal structure determination revealed the formation of a one‐dimensional structure belonging to monoclinic crystal system, space groupP21/cwith cell parametersa= 0.8043(1) nm,b= 1.8949(3) nm,c= 1.1048(1) nm, β = 110.109(4)°,V= 1.5810(4) nm3andZ= 4. The crystal was found to be stable up to approximately 300°C by thermal analysis and have an energy gap (Eg) of 2.0 eV exhibited by UV‐Vis‐NIR

ISSN:1001-604X    

DOI:10.1002/cjoc.20030210111

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

年代:2003

数据来源: WILEY