Syntheses, X-ray crystal structure and magnetic studies of a new dinuclear Cu~(II) complex, [Cu_2(μ-Cl)_2L _2Cl_2]·2CH_3CN, L: N,N,N′,N′- tetraisopropylpyridine-2,6-dicarboxamide

摘要

Reaction of anhydrous copper(II) chloride with N,N,N′,N′- tetraisopropylpyridine-2,6-dicarboxamide (L) leads to the synthesis of [Cu _2Cl_4L_2]·2CH_3CN, 1. The ligand coordinates to each Cu~(II) ion in a bidentate fashion through pyridine nitrogen and only one of the carbonyl oxygen atoms of the amide group rather than using tridentate coordination mode O-N-O. The structure can be described as a dichloro bridged centrosymmetric dimer where the two copper centers are pentacoordinated in a square pyramidal fashion. The two pyramids are arranged sharing a basal edge with their apical positions oriented opposite to each other. The crystal packing investigations show a 2D sheet in the lattice held together by dimeric acetonitrile entities. Complex 1 shows weak antiferromagnetic coupled Cu~(2+) ions.