Issue 14, 2006

Ligating properties of a potentially tetradentate Schiff base [(CH3)2NCH2CH2N[double bond, length as m-dash]CHC6H3(OH)(OMe)] with zinc(ii), cadmium(ii), cobalt(ii), cobalt(iii) and manganese(iii) ions: synthesis and structural studies

Abstract

A series of Zn(II), Cd(II), Co(II), Co(III) and Mn(III) complexes with the Schiff base [(CH3)2NCH2CH2N[double bond, length as m-dash]CHC6H3(OH)(OMe)], LH, derived from 2-dimethylaminoethylamine and o-vanillin, has been synthesised and structures of all the products have been established by X-ray crystallography. In the cases of zinc and cadmium, dimeric complexes [Zn(LH)2(NCS)] [Zn2(L)(µ1,1-CH3COO)(NCS)3] (1), [Cd2(L)2(Cl)2] (2) and [Cd2(L)2(NCS)2] (3), and for cobalt and manganese, monomeric complexes [Co(LH)2(NCS)]2 [Co(NCS)4] (4), [Co(LH)2(NCS)]ClO4 (5), [Co(L)(N3)(o-vanillinate)]·0.5MeOH (6) and [Mn(LH)2(MeOH)2](ClO4)3 (7), are formed with various terminal ligands. All the complexes have been characterised by elemental analysis and IR spectra. UV-Vis and NMR spectroscopy, magnetic, and electrochemical studies, were also carried out where feasible. The Schiff base functions as a bi-, tri- or tetra-dentate chelating agent and coordinates via the protonated or deprotonated phenolic oxygen, amine and imine nitrogens, and only in case of 1 with the methoxy oxygen atoms, to the metal ion leading to the formation of mono- or bi-metallic complexes.

Graphical abstract: Ligating properties of a potentially tetradentate Schiff base [(CH3)2NCH2CH2N [[double bond, length as m-dash]] CHC6H3(OH)(OMe)] with zinc(ii), cadmium(ii), cobalt(ii), cobalt(iii) and manganese(iii) ions: synthesis and structural studies

Supplementary files

Article information

Article type
Paper
Submitted
28 Aug 2005
Accepted
30 Nov 2005
First published
06 Jan 2006

Dalton Trans., 2006, 1758-1767

Ligating properties of a potentially tetradentate Schiff base [(CH3)2NCH2CH2N[double bond, length as m-dash]CHC6H3(OH)(OMe)] with zinc(II), cadmium(II), cobalt(II), cobalt(III) and manganese(III) ions: synthesis and structural studies

S. Sen, P. Talukder, S. K. Dey, S. Mitra, G. Rosair, D. L. Hughes, G. P. A. Yap, G. Pilet, V. Gramlich and T. Matsushita, Dalton Trans., 2006, 1758 DOI: 10.1039/B512053E

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