X-ray structures of dinuclear copper(I) and polynuclear copper(II) complexes with the 2,4-bis(cyanamido)cyclobutane-1,3-dione (cas 15506-53-3) dianion

Add time:08/24/2019    Source:sciencedirect.com

From the 2,4-bis(cyanamido)cyclobutane-1,3-dione dianion (2,4-NCNsq2−), two copper complexes [Cu2(PPh3)4(PhCN)2(μ-2,4-NCNsq)] · PhCN (1) and [Cu(dien)(μ-2,4-NCNsq) · H2O]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-NCNsq2− 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-NCNsq2− 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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Next:Nickel coordination compounds of the cyanamido squarate ligand. The crystal structures of the 2,4-bis(cyanamido)cyclobutane-1,3-dione (cas 15506-53-3) dianion (2,4-NCNsq2−) and of three polymers with general formula [Ni(Him)x(H2O)4 − x(2,4-NCNsq) · yH2O]n (x = 2–4; y = 1–3; Him = imidazole))