76 Novel Tin and Lead Compounds with Triazole-Based Chalcogen Phosphoranyl Ligands, Unexpected Tin-Ligand Coordination

Wednesday, November 4, 2009: 2:30 PM
Angus (Camino Real Hotel)
Verónica García-Montalvo, Prof. , Instituto de Química, Universidad Nacional Autónoma de México, Mexico City, Mexico
Marisol Correa-Ascencio , Instituto de Química, Universidad Nacional Autónoma de México, Mexico City, Mexico
Ana Paulina Gomora-Figueroa , Instituto de Química, Universidad Nacional Autónoma de México, Mexico City, Mexico
Raymundo Cea-Olivares , Instituto de Química, Universidad Nacional Autónoma de México, Mexico City, Mexico

In the last years studies on the coordination chemistry of the p-block elements containing P-G-P ligands (G = C, N, heterocycle) have aroused considerable interest, since the variety of available G linkage groups allows the study of a large diversity of coordination patterns.1 The triazole based phosphoranyl ligands, (4,5-bis(diphenyl)phosphoranyl)-1,2,3-triazole [4,5-(P(E)Ph2)Tz] (O, S, Se),2 are an interesting set of ligands, since they offer the opportunity to vary the chalcogen donor and permit a variety of potential coordination sites as the 5- and 7-membered chelates reported by Trofimenko2 and the E,N,N- tri-dentate coordination observed in bimetallic indium and group 2 compounds.3 This and the different coordination geometries obtained by softening the donor atoms in related P-G-P ligands4 motivated us to study these ligands with the heavy group 14 metals.

The synthesis and structural characterization of the compound obtained from tin(II) and lead(II) chlorides, and from R3SnCl (R = Me and Ph) are reported. Single crystal X-ray structures were obtained for Me3SnL compounds (E = O and S) and the sulfur Lead(II) complex. The ligands exhibit new and unexpected coordination modes on interacting with the metal, for instance, the oxygen and sulfur ligands display a N-monocoordinate behavior in Me3SnL, while the sulfur ligand shows a S,N,N-tridentate mode on binding to lead(II).

1      Coord. Chem. Rev. 2001, 223, 117.

2      Angew. Chem., Int. Ed. 2000, 39, 3321; Inorg. Chim.Acta. 2002, 303, 38.

3      Inorg. Chem. 2006, 45, 5167; Inorg. Chem. 2006, 48, 2518.

4      Dalton Trans. 2005, 1017.