Abstract
From the 2,4-bis(cyanamido)cyclobutane-1,3-dione dianion (2,4-NCNsq 2−), two copper complexes [Cu 2(PPh 3) 4(PhCN) 2(μ-2,4-NCNsq)] · PhCN ( 1) and [Cu(dien)(μ-2,4-NCNsq) · H 2O] n ( 2) have been synthesized and characterized by IR and electronic absorption spectroscopies. Their structures have been determined by X-ray crystallography. Complex 1 is a dinuclear copper(I) compound with a 2,4-NCNsq 2− ligand bridging two copper atoms through the nitrile nitrogen atoms. Complex 2 appears as a 3D network constituted of copper(II) atoms bridged by 2,4-NCNsq 2− dianions. This complex presents an unexpected coordination mode of the bis(cyanamido) ligands which are both coordinated via the nitrile functions and via the amido nitrogen atoms of the NCN groups.
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