Mechanochemical reaction of polymeric oxovanadium(IV) complexes with Schiff base ligands derived from 5-nitrosalicylaldehyde and diamines

摘要

Light brown [VO(5-NO(2)salen)] . 2H(2)O (1; H-2(5-NO2 salen) = N, N'-di-5-nitrosalicylidene-1,2-ethanediamine) and orange [VO(5-NO(2)sal-meso-stien)] . 0.5H(2)O (2; H-2(5-NO(2)sal-meso-stien) = N,N'-di-5-nitrosalicylidene-(R,S)(S,R)-1,2- diphenyl-1,2-ethanediamine) which have linear chain structures in the solid state turn dark brown and yellow-brown, respectively, when ground thoroughly in mortars. The IR spectra of 1 and 2 in Nujol mulls show strong V = O stretching bands at 875 and 905 cm(-1), respectively. On the other hand, the spectra of the finely ground complexes in Nujol mulls show very weak V = O stretching bands. X-ray powder diffraction patterns of the ground complexes scarcely show diffraction peaks. The spectroscopic and magnetic data suggest that the linear chain structures in the crystals of 1 and 2 are destroyed on grinding to yield the fragments of the polymeric chains. (C) 2000 Academic Press. [References: 13]