Solid state 15N and 13C NMR study of dioxomolybdenum(VI) complexes of Schiff bases derived from trans-1,2-cyclohexanediamine

The C-13, N-15 CP MAS NMR and FT-IR spectra of dioxomolybdenum (VI) complexes of trans-N,N'-bis-(R-salicylidene)-1,2-cyclohexanediamine (R = H, R = 3,5-diCl, R = 3,5-diBr, R = 4,6-diOCH(3)), trans-NM-bis-(2-OH-naphthylidene)-1,2-cyclohexanediamine and trans-N-(saticylidene)-N'-(2-OH-naphthylidene)-1,2-cyclohexanediamine have been measured. Comparative analysis of the NMR and IR spectra of the complexes with those of the corresponding ligands has shown that the complexation of the di-Schiff bases leads to changes in the conformation of the ligands and the charge redistribution. The asymmetric structure and non-planar structure of the complexes have been suggested. (C) 2004 Elsevier B.V. All rights reserved.