摘要:

AbstractApplication of samarium diiodide, samarium triiodide, Sm0/auxiliary system and organosamarium reagents in organic synthesis was reviewed.

ISSN:1001-604X    

DOI:10.1002/cjoc.19990170102

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

年代:1999

数据来源: WILEY

摘要:

AbstractThe intermolecular interactions in alkali‐doped C60solids, A3‐x‐yA′xA″yC60(A, A′, A″ = alkali;x+y⩽ 3), have been calculated, and their correlations with the structures and the superconducting transition temperaturesTchave also been investigated. It is found that the variations of the lattice constantsa0of A3‐x‐ yA′xA″yC60solids and the superconducting transition temperaturesTccan be satisfactorily explained from the viewpoint of interaction. It is shown that the relationship ofTcwith interaction is much closer than that ofTcwith lattice constanta0, Therefore, we can say it is the physical factors such as interaction, other than the geometrical structure factors such asa0, that should be reasonably taken as the primitive cause of the sudden change of superconductivity from pristine C60to its alkali‐doped compounds and of the variation ofTcamong supercon

ISSN:1001-604X    

DOI:10.1002/cjoc.19990170103

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

年代:1999

数据来源: WILEY

摘要:

AbstractFourμ‐ oxamido heterodinuclear complexes, [Cu (oxae) Cr (L)2] (NO3)3, where oxae denotes theN, N'bis (2‐aminoethyl) oxamido dianion and L represents 1,10‐phenanthroline (phen); 5‐nitro‐1,10‐phenanthroline (NO2‐phen); 5‐methyl‐1, 10‐phenanthroline (Me‐phen) and 2, 2′‐bipyridine (bpy), have been synthesized and characterized by elemental analyses, magnetic moments (at room temperature) and molar conductivity measurements and spectroscopy. It is proposed that these complexes have extended oxamido‐bridged structures consisting of a copper (II) ion and a chromium (III) ion, which have a square planar environment and octahedral environment, respectively. The cryomagnetic properties of the [Cu(oxae)Cr(bpy)2(NO3)3(1) and [Cu(oxae)Cr(phen)2](NO3)3(2) complexes have been measured over the range of 4.2–300 K. The leastsquares fit of the experimental data based on the spin Hamiltonian, Ĥ = ‐2JŜ1·Ŝ2, the exchange integrals (J) were evaluated as +36.9 cm−1for 1 and +35.8 cm−1for 2. The reds have connived that the spin coupling between the adjacent copper (II) and chromium (III) ions through oxamido

ISSN:1001-604X    

DOI:10.1002/cjoc.19990170104

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

年代:1999

数据来源: WILEY

摘要:

AbstractThe crystal structure of Ni (II) complex with 3‐hydroxyl‐1,5‐diazacycloheptane‐N, N′‐diacetate was determined by X‐ray diffraction method. Crystal data for Ni2(C9H14N2O5)2·2H2O: monoclinic, space group P21/n, a=1.1717(5),b=0.9794(3),c= 1. 2971(2) nm, β=96.62(3),V= 1. 4786(7) nm3,Dc= 1. 377 g/cm3,Z= 2, μ =13.321 cm−1(Mo‐Ka),F(000) = 640. The finalRandRωare 0.075 and 0.089 respectively. The Ni(II) ion forms 2:2 complex with ligand. Two ligands are bridged by two Ni(II) atoms which are bridged by two 0 atom. Every Ni(II) is coordinated by two N atoms and four O atoms The coordination polyhedron of the Ni(II) ion is a

ISSN:1001-604X    

DOI:10.1002/cjoc.19990170105

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

年代:1999

数据来源: WILEY

摘要:

AbstractThe monomeric cobalt‐phosphite‐thiolato complex [ Co (mpt)2{P (OCH3)3}2] BF4(Hmpt = 2‐mercaptothiazoline) has been prepared and characterized by X‐ray crystallography. The complex crystallizes in the monoclinic space group C2/cwitha= 0.8078(5),b= 2.6020(18),c= 1.2191(7) nm, β= 99.38 (1)°,V =2.528(3) nm3, and Z = 4. The structure comprises discrete cations [Co (mpt)2(P(OCH3)3}2]+and anions BF4−, in which the cobalt (III) atom is coordinated to two chelate mpt−and twocis‐oriented monodentate P(OCH3)3ligands in a highly distorted octahedral geometry. The most distorted angles are S(2)‐Co(1)‐S(2a) of 162.23(10)° and N (l)‐Co(1)‐S(2) of 71.47 (13)°, the latter is caused by the geometric constraint of the bidentate ligand mpt−. Cyclic voltammetry has been used to study the electrochemical behavior of the title complex on the Pt electrode in MeCN solution with 0.1 mol · L−1of Bu4nNBF489 electrolyte, The dts indicate that the tit

ISSN:1001-604X    

DOI:10.1002/cjoc.19990170106

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

年代:1999

数据来源: WILEY

摘要:

AbstractBy the additional reaction of binuclear compounds (Me4N)2M2S4(TDT)2(M = Mo, W; H2TDT= H2CH3GH3S2) with mononuclear cuprous complex, two new M‐Cu‐S clusters Mo2Cu2S4(TDT)2‐(PPh3)2CH3CH2OH (1) and W2Cu2S4(TDT)2(PPh3)2· 0. 5CH3CH2OH·0. 5H2O (2) have been prepared and characterized by IR, UV‐Vis,31P NMR spectroscopy, cyclic voltammetry and single crystal X‐ray structure analysis. Both compounds crystallize in space groupP21/ nwith lattice parametersa= 1.0956(3),b= 2. 2072(3),c=2.4340(3) nm, β=100.36(2)°,V=5.790(3) nm3andZ= 4 for 1 anda =1.0965(9),b= 2.2135(3),c= 2.4317(4) nm, β = 99. 63(8)°,V= 5.819(8) nm3andZ= 4 for 2. Both molecular structures contain a cubane‐like cluster core [M2Cu2S4] (M= Mo, W) and their skeletons are almost the same except for M atoms. The syntheses, structures and spectrum characterizations of these two clusters are discussed. The third‐order nonlinear optical (NLO) property of the two clusters was studied by the technique of forward degenerate four‐wave mixing (DFWM) for the first time and these clusters exhibited relatively large nonlinear

ISSN:1001-604X    

DOI:10.1002/cjoc.19990170107

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

年代:1999

数据来源: WILEY

摘要:

AbstractTwenty 10‐hydrocarbylacridones and 2‐methylacridone, 1‐hydroxyacridone were synthesized from acridone and characterized by mp, IR, UV,1H NMR and MS. Using Nd:YAG as a laser source, the second‐order harmonic generation (SHG) values of the acridone derivatives were measured in powder state as compared with urea powder. The results showed that the SHG values of some of 10‐hydrocarbylacridones were higher than that of urea, while others were lower. Although the hydrocarbyl substituents (R) attached to nitrogen atom of acridone were different in size and electronegativity, they had a little effect on the SHG values of 10‐hydrocarbylacridones. Substituents, such as methyl or hydroxy group connected to the phenyl ring, caused a little effect on the SHG values, too, compared with acrid one. The ability of R to push electron toward the nitrogen atom or to pull electron from the nitrogen atom play an important role on the maximum wavelengths of UV‐visible absorption of acridon

ISSN:1001-604X    

DOI:10.1002/cjoc.19990170108

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

年代:1999

数据来源: WILEY

摘要:

Abstract2‐Phenyl‐1, 2, 3‐triazole‐4‐formylhydrazine (2) was prepared by hydrazinolysis of the corresponding ester 1. Reaction of 2 with CS2/KOH gave the oxadiazole derivatives (3) whichviaMannich reaction with different dialkyl amines furnished3‐N, N‐dialkyl derivatives (4a–c). Also, condensation of 2 with appropriate aromatic acid in POCI3yielded oxadiazole derivatives (5a–c), or with aldehydes and ketones afforded hydrazones (6a–c). Cyclization of (6a–c) with acetic anhydride gave the desired dihydroxadiazole derivatives (7a–c). On the other hand, reaction of dithiocarbazate (8) with hydrazine hydrate gave the corresponding triazole derivative (9) which on treatment with carboxylic acids in refluxing POCI3yielded s‐triazole [3, 4–b]‐1, 3, 4‐thiadiazole derivatives (10a–b). The structures of all the above compounds were confirmed by means of IR,

ISSN:1001-604X    

DOI:10.1002/cjoc.19990170109

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

年代:1999

数据来源: WILEY

摘要:

AbstractFour series of trifluorobenzoate liquid crystals have been synthesized. Their phase transition temperatures have been also measured by texture observation in a polarizing microscope and confirmed by DSC. The influence of the lateral fluoro‐substitution and triple bond has been also discusse

ISSN:1001-604X    

DOI:10.1002/cjoc.19990170110

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

年代:1999

数据来源: WILEY

摘要:

AbstractVarious enols of 2‐acylmethyl‐4, 4‐dimethyl‐2‐oxazolines were prepared in moderate yields via ultrasonically catalyzed reactions of 2, 4, 4‐trimethyl‐2‐oxazoline with arenecarboxylic esters in the presence of UDP‐t‐

ISSN:1001-604X    

DOI:10.1002/cjoc.19990170111

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

年代:1999

数据来源: WILEY