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Open Access Three phenanthroline–metal complexes with topologically similar but geometrically different conformations

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The structures of three related complexes of general formula M(pds)(nab)2 [pds is the peroxodisulfate anion and nab is an nitrogen-containing aromatic base], viz. bis(2,9-dimethyl-1,10-phenanthroline-κ2N,N′)(peroxodisulfato-κ2O,O′)cadmium, [Cd(S2O8)(C14H12N2)2], (V), bis(3,4,7,8-tetramethy-1,10-phenanthroline-κ2N,N′)(peroxodisulfato-κ2O,O′)zinc, [Zn(S2O8)(C16H16N2)2], (VI), and bis(3,4,7,8-tetramethy-1,10-phenanthroline-κ2N,N′)(peroxodisulfato-κ2O,O′)cadmium, [Cd(S2O8)(C16H16N2)2], (VII), present the same topological coordination, with three chelating ligands in an MN4O2 polyhedron. The main difference resides in the fact that the first two complexes are bisected by a crystallographic twofold axis, thus providing a symmetrical environment to the cation, while in the third one this symmetry is disrupted into a clearly unsymmetrical disposition, probably by way of an unusually strong intramolecular C—H...O hydrogen bond. The situation is compared with similar interactions in the literature. The structure of (V) is based on a redetermination in the correct space group C2/c of the structure originally described in the Cc space group [Harvey et al. (2001). Aust. J. Chem. 54, 307–311; Marsh (2004). Acta Cryst. B60, 252–253].
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Document Type: Research Article

Affiliations: 1: Universidad Nacional de la Patagonia S.J.B., Sede Trelew, 9100 Trelew, Chubut, Argentina 2: Departamento de Química Inorgánica, Analítica y Química Física/INQUIMAE-CONICET, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina 3: Departamento de Física, Comisión Nacional de Energía Atómica, Buenos Aires, Argentina

Publication date: January 1, 2016

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