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Issue 41, 2006
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Rhenium complexes of tris(pyrazolyl)methanes and sulfonate derivative

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Abstract

The trioxo [ReO3{SO3C(pz)3}] (1) (pz = pyrazolyl) and oxo [ReOCl{SO3C(pz)3}(PPh3)]Cl (2) compounds with tris(pyrazolyl)methanesulfonate were obtained by treatment of Re2O7 or [ReOCl3(PPh3)2], respectively, with Li[SO3C(pz)3], whereas [ReCl3{HC(pz)3}] (3), [ReCl3{HC(3,5-Me2pz)3}] (4) and [ReCl42-HC(pz)3}] (5) were prepared by reaction of [ReOCl3(PPh3)2] (3,4) or [ReCl4(NCMe)2] (5) with hydrotris(pyrazolyl)methane HC(pz)3 (3,5) or hydrotris(3,5-dimethyl-1-pyrazolyl)methane HC(3,5-Me2pz)3 (4). [ReO{SO3C(pz)3}{OC(CH3)2pz}][ReO4] 6, with a chelated pyrazolyl-alkoxide, was derived from an unprecedented ketone-pyrazolyl coupling on reaction of crude 1 with acetone. The compounds have been characterized by elemental analyses, IR and NMR spectroscopies, FAB-MS spectrometry and cyclic voltammetry and, in the case of 5 and 6, also by single-crystal X-ray diffraction. The electrochemical EL Lever parameter has been estimated, for the first time, for the SO3C(pz)3 and oxo ligands allowing the measurement of their electron-donor character and comparison with other ligands. Compounds 1, 2 and 6 appear to be the first tris(pyrazolyl)methanesulfonate complexes of rhenium to be reported.

Graphical abstract: Rhenium complexes of tris(pyrazolyl)methanes and sulfonate derivative

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Supplementary files

Article information


Submitted
03 Aug 2006
Accepted
25 Aug 2006
First published
06 Sep 2006

Dalton Trans., 2006, 4954-4961
Article type
Paper

Rhenium complexes of tris(pyrazolyl)methanes and sulfonate derivative

E. C. B. Alegria, L. M. D. R. S. Martins, M. Haukka and A. J. L. Pombeiro, Dalton Trans., 2006, 4954
DOI: 10.1039/B611209A

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