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

Olivier Cortadellas , Anne-Marie Galibert (1) , Brigitte Soula (1) , Bruno Donnadieu (2) , Paul-Louis Fabre

1 CIRIMAT - Centre interuniversitaire de recherche et d'ingenierie des matériaux
2 LCC - Laboratoire de chimie de coordination

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.

Mots clés: Pseudo-oxocarbons; X-ray diffraction; Copper(I) dimer; Copper(II) chain; Cyanamido complexes

Domaines: Chimie inorganique

Olivier Cortadellas, Anne-Marie Galibert, Brigitte Soula, Bruno Donnadieu, Paul-Louis Fabre. X-ray structures of dinuclear copper(I) and polynuclear copper(II) complexes with the 2,4-bis(cyanamido)cyclobutane-1,3-dione dianion. Inorganica Chimica Acta, 2006, 3 (5), pp.1573-1581. ⟨10.1016/j.ica.2005.11.002⟩. ⟨hal-03599315⟩