The trinuclear nickel? complex Ni3(C11H11N2O3)2(C5H5N)4 was prepared by the reaction of Ni(OAc)2· 4H2O with N butylsalicylhydrazide Schiff base ligand and characterized by X ray crystallography. The crystal belon...The trinuclear nickel? complex Ni3(C11H11N2O3)2(C5H5N)4 was prepared by the reaction of Ni(OAc)2· 4H2O with N butylsalicylhydrazide Schiff base ligand and characterized by X ray crystallography. The crystal belongs to triclinic, Mr=930.91, space group with cell parameters a=9.8489(2)? , b=12.3110(2)? , c=18.4035(3)? , α =71.353(2)° , β =76.638(2)° ,γ =84.815(2)° ,V=2056.72(6)? 3,Z=2,Dc=1.503g· cm- 3, μ (MoKα ) =1.417mm- 1, F(000)=964, R=0.0317, wR=0.0868. A total of 5393 independent reflections were collected, of which 4448 reflections with I ≥ 2σ (I) were observed. There are two centrosymmetrical trinuclear molecules in a unit cell, each molecule exhibits a linear trinuclear metal arrangement with the Ni... Ni... Ni angle of 180° . The interatomic distances between the nickel atoms on the two sides are 9.2030(8)? and 9.1876(9)? for the two molecules, respectively. The central nickel atom adopts an axially elongated octahedral geometry whereas the nickel atoms on the two sides have square planar coordination environment. CCDC: 194083.展开更多
A new copper(Ⅱ) complex of a non‐symmetric Schiff base, [CuII(saldien)(H2O)]+(1), has been synthesized and characterized by elemental analysis and several other spectroscopic methods (Hsaldien = N‐(salicylidene)die...A new copper(Ⅱ) complex of a non‐symmetric Schiff base, [CuII(saldien)(H2O)]+(1), has been synthesized and characterized by elemental analysis and several other spectroscopic methods (Hsaldien = N‐(salicylidene)diethylenetriamine). The crystal structure of 1 has also been determined by X‐ray crystallography. The geometry of the complex cation in 1 was found to be distorted square pyramidal with the mononegative Schiff base coordinating to the copper in a tetradentate mode via the O,N,N', and N''‐donor atoms. The remaining coordination site was occupied by the O atom of a H2O molecule in the axial position. The catalytic potential of 1 was tested in the oxidation reactions of cyclooctene and cyclohexene with aqueous 30% H2O2/NaHCO3 in acetonitrile. These reactions proceeded smoothly to give the corresponding epoxides with selectivity levels greater than 99%. This catalytic system also showed high levels of activity and selectivity towards the oxidation of cyclohexane (i.e., cyclohexanol 37% and cyclohexanone 54%) in comparison with most of the other Cu‐based systems reported in the literature.展开更多
文摘The trinuclear nickel? complex Ni3(C11H11N2O3)2(C5H5N)4 was prepared by the reaction of Ni(OAc)2· 4H2O with N butylsalicylhydrazide Schiff base ligand and characterized by X ray crystallography. The crystal belongs to triclinic, Mr=930.91, space group with cell parameters a=9.8489(2)? , b=12.3110(2)? , c=18.4035(3)? , α =71.353(2)° , β =76.638(2)° ,γ =84.815(2)° ,V=2056.72(6)? 3,Z=2,Dc=1.503g· cm- 3, μ (MoKα ) =1.417mm- 1, F(000)=964, R=0.0317, wR=0.0868. A total of 5393 independent reflections were collected, of which 4448 reflections with I ≥ 2σ (I) were observed. There are two centrosymmetrical trinuclear molecules in a unit cell, each molecule exhibits a linear trinuclear metal arrangement with the Ni... Ni... Ni angle of 180° . The interatomic distances between the nickel atoms on the two sides are 9.2030(8)? and 9.1876(9)? for the two molecules, respectively. The central nickel atom adopts an axially elongated octahedral geometry whereas the nickel atoms on the two sides have square planar coordination environment. CCDC: 194083.
基金the University of Zanjan for providing financial support for this study
文摘A new copper(Ⅱ) complex of a non‐symmetric Schiff base, [CuII(saldien)(H2O)]+(1), has been synthesized and characterized by elemental analysis and several other spectroscopic methods (Hsaldien = N‐(salicylidene)diethylenetriamine). The crystal structure of 1 has also been determined by X‐ray crystallography. The geometry of the complex cation in 1 was found to be distorted square pyramidal with the mononegative Schiff base coordinating to the copper in a tetradentate mode via the O,N,N', and N''‐donor atoms. The remaining coordination site was occupied by the O atom of a H2O molecule in the axial position. The catalytic potential of 1 was tested in the oxidation reactions of cyclooctene and cyclohexene with aqueous 30% H2O2/NaHCO3 in acetonitrile. These reactions proceeded smoothly to give the corresponding epoxides with selectivity levels greater than 99%. This catalytic system also showed high levels of activity and selectivity towards the oxidation of cyclohexane (i.e., cyclohexanol 37% and cyclohexanone 54%) in comparison with most of the other Cu‐based systems reported in the literature.
