名称:
Synthesis and structural characterization of [(dpca)MX2] (M=Cu, X=Cl; M=Cd, X=Br and M=Zn, X=NO3) complexes containing N,N-di(2-picolyl)cyclohexylamine (dpca) and their application to methyl methacrylate polymerization
摘要:
A novel series of [(dpca)MX2] (M = Cu, X = Cl; M = Cd, X = Br and M = Zn, X = NO3) complexes were synthesized through the reaction of N,N-di(2-picolyl)cyclohexylamine (dpca) with the corresponding metal starting materials. X-ray crystallographic analysis determined that the metal center in complexes [(dpca)CuCl2], [(dPca)CdBr2] and [(dpca)zn(NO3)(2)] showed a distorted 5-coordinated square pyramidal, trigonal bipyramidal, and 7-coordinated pentagonal bipyramidal geometry, respectively, involving coordination of the nitrogen atom of the cyclohexylamine moiety with the metal center. Specifically, the catalytic activity of [(dpca)Zn(NO3)(2)] (1.04 x 10(5)g PMMA/mol Zn.h) for the polymerization of methyl methacylate (MMA) in the presence of modified methylaluminoxane (MMAO) at 60 degrees C was six-fold higher than the reference complex [ZnCl2] (1.73 x 10(4) g PMMA/mol Zn.h). (C) 2014 Elsevier B.V. All rights reserved.