Abstract
Two new complexes [Cu(bcen)Ni(CN)4]2 (1) and [Ni(bcen)Ni(CN)4] (2) where bcen is 4,7-diazadecanediamide, were synthesized by reaction of equimolar amounts of M(NO3)2 (M = Cu and Ni), bcen ligand and K2[Ni(CN)4]. Single-crystal X-ray diffraction analysis of compound 1, shows that the bcen ligand acts as a tridentate chelate, coordinating to the Cu(II) ion via the two nitrogen atoms of the amine groups and one oxygen atom of one amide group, and the other amide unit is left uncoordinated. The coordination geometry around the Cu(II) ions is five coordinate with a distorted square pyramid geometry, comprising two nitrogen atoms and one oxygen atom belonging to the bcen ligand and two nitrogen atoms of the cyano groups of two Ni(CN)4 2- units. The distance between the copper ion and the amide oxygen of the dangling arm of an adjacent tetranuclear species is within the expected range for an axial Cu-O bond, and hence suggests that the amide oxygen of an adjacent tetranuclear complex may weakly coordinate to the copper ion in an axial position. These contacts link the tetranuclear species into infinite chain polymers.
Highlights
In recent years a great effort has been focused on the design, synthesis and study of multinuclear transition metal complexes
The distance between the copper ion and the amide oxygen of the dangling arm of an adjacent tetranuclear species is within the expected range for an axial Cu–O bond, and suggests that the amide oxygen of an adjacent tetranuclear complex may weakly coordinate to the copper ion in an axial position
The complexes were initially characterized by infrared spectral techniques which were useful in identifying the bonding mode of the cyano groups in Ni(CN)42– to the metal(II) ion
Summary
In recent years a great effort has been focused on the design, synthesis and study of multinuclear transition metal complexes. These complexes have played an important role in the development of modern coordination chemistry, and can be utilized as model compounds for the active sites of multimetallo enzymes.[1,2] Among them, investigations of hetero-nuclear complexes tend to be more informative than the homo-nuclear complexes, due to interesting properties which can arise from the presence of two different metal ions.[3,4,5].
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