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1,3,5-Triazapentadienes as chelating ligands: 1,2,4-triphenyl-1,3,5-triazapentadiene complexes of cobalt(II), nickel(II), palladium(II), copper(II) and zinc(II)
He?e, Nadine,Fr?hlich, Roland,Humelnicu, Ionel,Würthwein, Ernst-Ulrich
, p. 2189 - 2197 (2007/10/03)
1,2,4-Triphenyl-1,3,5-triazapentadiene (1a), prepared from benzamidine and N-phenylbenzimidoyl chloride, was treated at room temperature with CoCl 2, Ni(NO3)2, Na2PdCl4, CuCl2 and ZnCl2 to form the corresponding six-membered 1: 1 chelate complexes 1a·CoCl2, 1a·Ni(NO 3)2, 1a-PdCl2, 1a-CuCl2, and 1a-ZnCl2. In the solid state 1a-Ni(NO3)2 forms infinite linear chains, bridged by nitrate ions. From 1a and Cu(OTf) 2 a 2:1 copper complex was obtained [(1a) 2·Cu(OTf)2]. In all cases a proton shift from nitro gen atom N1 in the free ligand to N3 in the complex was observed. All complexes were completely characterized including X-ray crystallography. Quantum chemical DFT calculations indicate that triazapentadiene is a better ligand for ZnCl2, PdCl2 and CuCl2 compared to β-diimines and N-acyl-amidines. Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005.
