Carboxylate shift in one dimension polymeric chain complexes [Cu (dien) (OAc) ] n (ClO4) n. Syntheses, crystal structure and spectroscopic study on isomer
摘要:
Two one dimension copper(II) polymer chain complexes with an identical molecular formula, [Cu(dien)(OAc)](n)(ClO4)(n), but different stuctural features were synthesized through the reaction of Cu-2(OAc)(4). 2H(2)O with M(dien)(2)(ClO4)(2) (M = Cu2+, Ni2+ and Zn2+; dien = diethylenetriamine). In complex I, the geometry at each Cu(II) ion is a distorted octahedron (4 + 2) (D. K. Towle, et al. Inorg. Chem. 1988, 27, 394-399); while in complex 2, that is pentacoordinate and best described asa distorted trigonal-bipyramid. The acetate groups act as monodentate bridging mode in 1, but as single syn-anti bridging fashion (Cu-O = 2.008(10) and 2.062(11) Angstrom) in 2. These provide a good example for the suggested pathway in the "carboxylate shift". The isomer can also be diagnosed by FT-IR and FT-Raman spectroscopies, and X-ray powder diffraction. (C) 1998 Elsevier Science Ltd. All rights reserved.