Synthesis, Structure and Properties of a Mononuclear and an End‐On Double Azido‐Bridged Copper(II) Complex Incorporating an N,N,N,O‐Coordinating Tripodal Ligand

Abstract

AbstractThe blue coloured complex [Cu(HL)(H2O)(ClO4)]ClO4·H2O·MeOH (1·H2O·MeOH) has been synthesised in excellent yields by reacting Cu(ClO4)2·6H2O with N,N‐bis(2‐methylpyridyl)(3,5‐dimethyl‐2‐hydroxybenzyl)amine (HL) in methanol. The same reaction, when carried out in the presence of sodium azide, afforded a dark‐blue complex of formula [Cu2(HL)2(μ‐1,1‐N3)2](ClO4)2 (2). The crystal and molecular structures of the complexes have been solved. Variable‐temperature magnetic susceptibility data in the range of 2−300 K for 2 reveal the existence of an antiferromagnetic interaction through an end‐on azido linker. Temperature‐dependent susceptibility studies for 2 were fitted using the Bleaney−Bowers expression, which led to the parameters J = −3.2 cm−1, g = 2.12 and R = 2.14 × 10−4. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004)