摘要:

AbstractA variety of lanthanocene complexes,e. g. chlorides, hydrocarbyls, amides, hydrides and divalent derivatives, were synthesized by using a series of designed cyclopentadienyl, indenyl and fluorenyl ligands with ring bridges or donor‐functionalized sidearms. X‐Ray crystallographic analyses reveal the formation of intramolecular coordination bonds between central metals and heteroatoms (O, N) in sidearms or bridging chains. Some applications of these complexes are also discussed in this acco

ISSN:1001-604X    

DOI:10.1002/cjoc.20020200602

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

年代:2002

数据来源: WILEY

摘要:

AbstractThe title platinaborane, [(P(2)Ph3)Pt(l)(μ2‐B(11)‐(B(9)‐OC‐(CH3)3‐B10H10)Pt(7)(P(1)Ph3)]2, a triple cluster, which is a binuclear Pt complex dimmer, was prepared. Single crystal X‐ray diffraction analysis shows that a Pt(7)atom served as a common vertex between cluster |PtB10| and |Pt4|. The |Pt4| cluster is of p

ISSN:1001-604X    

DOI:10.1002/cjoc.20020200603

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

年代:2002

数据来源: WILEY

摘要:

AbstractTo test the theory of dissociative electron transfer, a simple model describing the kinetics of electron transfer bond‐breaking reactions was used. The Hamiltonian of the system was given. The homogeneous and heterogeneous kinetic data fit reasonably well with an activation‐driving force relationship derived from the Marcus quadratic theory. In the heterogeneous case, there is a good agreement between the theoretical calculation and the experimental result, while in the homogeneous case, a good agreement is only observed for the tertiary halides. This is due to the stability of tertiary radical resulting from the sterical eff

ISSN:1001-604X    

DOI:10.1002/cjoc.20020200604

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

年代:2002

数据来源: WILEY

摘要:

AbstractThe kinetics of RE (La, Gd, Er, Yb and Y) extraction withsec‐octylphenoxy acetic acid was investigated using a constant interfacial area cell with laminar flow at 303 K. The natures of the extracted complexes have some effect on the extraction rate which is controlled by the reaction rate of M(III) and extractant molecules at two‐phase interface for Er(III), Yb(III) and Y(III), by a mixed chemical reaction‐diffusion for Gd (III) and a diffusion for La(III). The extractant molecules tend to adsorb at the interface. So an interfacial extraction reaction model was de

ISSN:1001-604X    

DOI:10.1002/cjoc.20020200605

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

年代:2002

数据来源: WILEY

摘要:

AbstractThe synthesis of a new series of asymmetric cationic gemini surfactant and the investigation of their micellization behaviors by electronic spin resonance (ESR) as well as the surface tension measurements were reported. 4‐Oxo‐2,2,6,6‐tetramethylpiperidine‐N‐oxyl (4‐oxo‐TEMPO) is used as the spin probe. The surfactants studied have the general formula [CnH2n+1N+(CH3)2C6H12N+(CH3)2CmH2m+1]Br2−, referred to as dimericn‐6‐msurfactants, in whichnandmare the numbers of carbon atoms in the asymmetric side alkyl chains. From the experimental data, rotational correlation time τc, surface tension and critical micelle concentration (cmc) values, the physical properties of these new surfactants have preliminarily been e‐valuated. It is shown that this new series of asymmetric gemini surfactants has interesting micellization behaviors, and they are very different in aggregating tendency from thei

ISSN:1001-604X    

DOI:10.1002/cjoc.20020200606

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

年代:2002

数据来源: WILEY

摘要:

AbstractSeveral new calixcrowns were synthesized and characterized. The transport of Ca2+ion was investigated through a bubbling pseudo‐emulsion liquid membrane with these calixcrowns, the parent calix[n]arenes (n= 4, 6, 8) and the ester, acid derivatives of calix[4]arene as mobile carriers. The effects of the initial concentrations of Ca2+ion in the source phase and the initial pH difference (ΔpH) between the receiving phase and the source phase were studied. The results suggest that there are two different transport mechanisms. The transports using calixarenes and their ester, acid derivatives as carriers represent a proton‐coupled co‐transport with a flow of protons in the opposite direction, while the transports using the calixcrowns as carriers exhibit the characteristics of an anion‐coupled co‐transport with a flow of anion in the same

ISSN:1001-604X    

DOI:10.1002/cjoc.20020200607

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

年代:2002

数据来源: WILEY

摘要:

AbstractThe title compound Cu2Cl2phen (phen = 1,10‐phenanthroline, C12H8N2) 1 was synthesized from CuCl2·2H2O, CuCl and phen by hydrothermal method and its structure was determined by single crystal X‐ray analysis. With phen, CuG forms one‐dimensional chains, which comprise two zigzag chains based on fused Cu‐X units and connected via covalent bonds. The compound contains two crystallographically unique monovalent copper ions, Cu(1) and Cu(2). The Cu(1) atom in the tetrahedral site, is coordinated to two bridging Cl−and two N atoms in phen. The Cu(2) atom with a slightly distorted triangular planar geometry, is coordinated to three Cl−. The compound 1 was crystallized in monoclinic, space group P21/nwitha= 0.37338(4),b= 1.9510(2),c= 1.68008(19) nm,β= 95.605 (3)°,R= 0.0458, and was characterized by elemental analysis, IR spectrum an

ISSN:1001-604X    

DOI:10.1002/cjoc.20020200608

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

年代:2002

数据来源: WILEY

摘要:

AbstractThe reaction between K(1‐C5H9C9H6) and anhydrous LnCl3(Ln=Sm, Yb) in the molar ratio of 2:1 in THF with subsequent treatment by Na‐K alloy afforded (1‐C5H9C9H6)2Ln‐(THF)n(Ln=Sm,n=1; Ln=Yb,n=2), while the reaction of Sml2with K(1‐C5H9C9H6) in the molar ratio of 1:2 in THF gave the anionic complex K(1‐C5H9C9H6)3Sm(THF)3. The X‐ray structure of (1‐C5H9C9H6)2Yb(THF)2showed that central metal Yb is coordinated by two cyclopentadienyl rings of 1‐cyclopentylindenyls and two oxygen atoms from two tetrahydrofuran molecules to form pseudo‐tetrahedral coordinate geometry. All these complexes are active for the polymerizati

ISSN:1001-604X    

DOI:10.1002/cjoc.20020200609

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

年代:2002

数据来源: WILEY

摘要:

AbstractTwo palladium(II) complexes, [Pd(bipy)(BzPhe‐N,O)] and [Pd(phen)(BzPhe‐N,O)]·4H2O were synthesized by reactions between Pd(bipy)Cl2and BzPheH2(N‐benzoyl‐β‐phenylalanine), Pd(phen) Cl2and BzPheH2in water at pH‐9, with their structures determined by X‐ray diffraction analysis. The Pd atom is coordinated by two nitrogen atoms of bipy (or phen), the deprotonated amido type nitrogen atom and one of the carboxylic oxygens of BzPhe (BzPhe =N‐benzoyl‐β‐phenylalaninate dianion). In the complex [Pd(phen) (BzFne‐N,O)] · 4H2O, the side chain of phenylalanine is located above and approximately parallels to the coordination plane. Both the aromatic‐aromatic stacking interaction between the phenyl ring of phenylalanine and phen, and the metal ion‐aromatic interaction between the phenyl ring of phenylalanine and Pd(II) were observed. [Pd(bipy)(BzPhe‐N,O)] has the phenylalanyl side chain oriented outwards from the coordination plane, which is mainly due to the interaction between the carbonyl oxygen atom of the amido group and the phenyl ring of phenylalanine. The reason for the different orientation of phenylalanyl side chain

ISSN:1001-604X    

DOI:10.1002/cjoc.20020200610

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

年代:2002

数据来源: WILEY

摘要:

AbstractThe techniques of oxygen electrode polarography and Fourier transform infrared (FT‐IR) spectroscopy were employed to explore the involvement of digalactosyl diacylglycerol (DGDG) in functional and structural roles in the photosystem II core complex (PSIICC). It was shown that DGDG exhibited the ability to stimulate the oxygen evolution in PSIICC, which was accompanied by the changes in the structures of PSIICC proteins. The results revealed that there existed hydrogen‐bonding interactions between DGDG molecules and PSIICC proteins. It is most likely that the sites of PSIICC interaction with DGDG are in the extrinsic protein of 33

ISSN:1001-604X    

DOI:10.1002/cjoc.20020200611

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

年代:2002

数据来源: WILEY