Cu(II) compounds with pyrimidine-based chelating ligands, bridged by a flexible alkyl spacer: Synthesis, characterisation and X-Ray structures of methoxide-bridged dinuclear-based species

Abstract

The synthesis and full structural characterisation is described of 3 dinuclear-based Cu(II) compounds bridged by methoxide anions, and flexible linear bis(pyrimidine)-α,ω-diaminoalkane ligands. The structures are dinuclear based in all cases, in which the bis(pyrimidine)diaminoalkane ligand chelates to 2 Cu(II) ions in the same dinuclear unit (N-C-C-C-C-C-N linker), or to two different dinuclear units (with the short N-C-C-N linker), thereby generating a polymeric chain. The magnetic exchange in the compounds is dominated by the alkoxido-bridged ligands, which generate a very strong antiferromagnetic coupling between the Cu(II) ions, resulting in diamagnetism at room temperature and below, and EPR silent behaviour. © The Author(s) 2008.