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-κ2 N,N′)(peroxodisulfato-κ2 O,O′)cadmium, [Cd(S2O8)(C14H12N2)2], (V), bis(3,4,7,8-tetramethy-1,10-phenanthroline-κ2 N,N′)(peroxodisulfato-κ2 O,O′)zinc, [Zn(S2O8)(C16H16N2)2], (VI), and bis(3,4,7,8-tetramethy-1,10-phenanthroline-κ2 N,N′)(peroxodisulfato-κ2 O,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].
Documento: | Artículo |
Título: | Three phenanthroline-metal complexes with topologically similar but geometrically different conformations |
Autor: | Harvey, M.A.; Suarez, S.; Baggio, R. |
Filiación: | Universidad Nacional de la Patagonia S.J.B., Sede Trelew, Trelew, Chubut, 9100, Argentina CenPat, CONICET, Puerto Madryn, Chubut, 9120, Argentina Departamento de Química Inorgánica, Analítica y Química Física/INQUIMAE-CONICET, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina Departamento de Física, Comisión Nacional de Energía Atómica, Buenos Aires, Argentina |
Palabras clave: | Cd and Zn complexes; crystal structure; peroxodisulfate anion; strong C - H⋯O intramolecular hydrogen bonds |
Año: | 2016 |
Volumen: | 72 |
Página de inicio: | 1581 |
Página de fin: | 1586 |
DOI: | http://dx.doi.org/10.1107/S2056989016016029 |
Título revista: | Acta Crystallographica Section E: Crystallographic Communications |
Título revista abreviado: | Acta Crystallographica Section E: Crystallographic Communications |
ISSN: | 20569890 |
Registro: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_20569890_v72_n_p1581_Harvey |