Mono and Dinuclear Cadmium(II) Complexes with the Ligand cis-2,4,5-tri(2-pyridyl)imidazoline
José J. Campos-Gaxiola,1 Herbert Höpfl,2 Miguel Parra-Hake1*
1 Centro de Graduados e Investigación, Instituto Tecnológico de Tijuana, Apartado Postal 1166, 22000 Tijuana, Baja California México. mparra@tectijuana.mx.
2 Centro de Investigaciones Químicas, Universidad Autónoma del Estado de Morelos, Av. Universidad 1001, Cuernavaca 62209, México. hhopfl@ciq.uaem.mx.
]]> Recibido el 12 de septiembre del 2006;
Resumen
El ligando polipiridínico cis-2,4,5-tri(2-piridil)imidazolina (L) forma complejos de Cd(II) con diferente nuclearidad, [Cd(L)(NO3)2(MeOH)] (1) y [Cd(μ-L)Cl2]2 (2), comportándose de manera tridentada. La estructura de 1 muestra un complejo mononuclear, mientras que la de 2 consiste de un complejo dinuclear con L como puente entre dos centros metálicos. En 1 se observan enlaces de hidrógeno intramoleculares e intermoleculares formando cadenas 1-D, así como una interacción del tipo CH···π. En la estructura del complejo 2 se observa sólo una interacción del tipo π-π intramolecular.
Palabras clave: Ligando polipiridínico, imidazolina, Cadmio(II), Estructura cristalina, Complejo mononuclear, Complejo dinuclear, Interacciones no-covalentes.
Abstract
The polypyridyl ligand cis-2,4,5-tri(2-pyridyl)imidazoline (L) is found to form Cd(II) complexes of different nuclearity, [Cd(L)(NO3)2(MeOH)] (1) and [Cd(μ-L)Cl2]2 (2), behaving as a tridentate ligand. The X-ray diffraction analysis of 1 shows a mononuclear complex, while the structure of 2 consists of a dinuclear complex with two L ligands bridging the two metal centres. Intra and intermolecular hydrogen bonds are observed in 1 forming 1-D chains, as well as one intramolecular CH···π interaction. In 2 only one intramolecular π-π interaction is observed.
Key words: Pyridyl and imidazoline ligand, Cadmium(II), Crystal structure, Mononuclear complex, Dinuclear complex, non-covalent interactions.
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Acknowledgements
This work was supported by Consejo del Sistema Nacional de Educación Tecnológica (COSNET) Grant No. 418.03-P.J.J.C.-G. thanks the support from Consejo Nacional de Ciencia y Tecnología (CONACYT) in the form of a scholarship. The authors are indebted to Dr. I. Rivero and Dr. D. Chávez of Instituto Tecnológico de Tijuana for analytical support, Instituto de Química-UNAM for a preliminary diffraction study of complex 2, Dr. V. Jancik at IQ-UNAM, and Prof. P. J. Walsh at the University of Pennsylvania for their valuable contributions to this work.
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