Synthesis and characterization of a (1+1) cyclic Schiff base of a lower rim 1,3-diderivative of p-tert-butylcalix[4]arene and its complexes of VO2+, UO22+, Fe3+, Ni2+, Cu2+ and Zn2+

A (1+1) macrocyclic calix[4]arene based Schiff base derivative has been synthesized and was subjected to complexation with different Ions or ionic species. viz, VO2+, UO22+, Fe-,(3+) Ni2+, CU2+ and Zn-.(2+) Both the conjugate and the complexes were characterized using various spectral techniques, viz, FTIR, H-1, C-13 NMR and FAB mass The complexes have been further characterized by UV-Vis, EPR and magnetic susceptibility, while the Iron complex was studied further by Mossbauer spectroscopy On the basis of all these studies, the VO2+ and UO22+ complexes were found to be mononuclear, whereas all the other complexes were found to be dinuclear. Based on the studies, the Iron complex was found have a distorted octahedral high spin Fe(III) center with an antiferromagnetically Coupled dinuclear core in the complex. (C) 2009 Elsevier Ltd. All rights reserved.