Rhenium chelate complexes with maltolate or kojate |
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Authors: | André Gustavo de A Fernandes Pedro Ivo da S Maia Elizeu J de Souza Sebastião S Lemos Alzir A Batista Ulrich Abram Javier Ellena Eduardo E Castellano Victor M Deflon |
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Institution: | 1. Instituto de Química de São Carlos, Universidade de São Paulo, 13560-970 São Carlos, SP, Brazil;2. Instituto de Química, Universidade de Brasília, 70904-970 Brasília, DF, Brazil;3. Departamento de Química, Universidade Federal de São Carlos, 13565-905 São Carlos, SP, Brazil;4. Institut für Chemie, Freie Universität Berlin, D-14195 Berlin, Germany;5. Instituto de Física de São Carlos, Universidade de São Paulo, 13560-970 São Carlos, SP, Brazil |
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Abstract: | Novel rhenium complexes containing the maltolate (mal) or kojate (koj) anions as chelating ligands have been synthesized: ReOCl(mal)2] (1), ReOCl2(mal)(PPh3)] (2), ReOBr2(mal)(PPh3)] (3), ReOCl2(koj)(PPh3)] (4) and ReOBr2(koj)(PPh3)] (5). The products have been characterized by FTIR, 1H, 13C, and 31P NMR spectroscopies and elemental analysis. The crystal and molecular structures of all complexes were determined. Complex 1 crystallizes monoclinic, space group C2/c, Z = 8. It contains two O,O′-bidentate maltolate ligands and one chloro ligand at the (ReO)3+ unit, so that a distorted octahedral geometry is adopted by the six-coordinated rhenium(V) center. The chloro ligand occupies a cis position to the oxo ligand. Complexes 2 and 3 are isostructural and crystallize orthorhombic, space group Pbca and Z = 8. The isostructural complexes 4 and 5 crystallize monoclinic, space group P21/n and Z = 4. In complexes 2–5, the (ReO)3+ unit is coordinated by a monoanionic O,O-bidentate unit of the maltolate (2 and 3) or kojate (4 and 5) ligand, one triphenylphosphine and two halogeno ligands (Cl in 2 and 4; Br in 3 and 5), with the rhenium(V) center in a distorted octahedral environment. The halide ligands are in cis positions to each other. |
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Keywords: | Mixed-ligand complexes Oxorhenium(V) Maltolate-like ligands Chloride Bromide Triphenylphosphine |
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