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Synthesis, Characterization, and Crystal Structure of [ReO(Me4tu)4](PF6)3 (tu = thiourea)

✍ Scribed by Dinorah Gambino; Eduardo Kremer; Enrique J. Baran; Alvaro Mombrú; Leopoldo Suescun; Raúl Mariezcurrena; Martina Kieninger; Oscar N. Ventura

Publisher
John Wiley and Sons
Year
1999
Tongue
German
Weight
127 KB
Volume
625
Category
Article
ISSN
0372-7874

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✦ Synopsis

A new Re V oxo complex with tetramethylthiourea, [ReO(Me 4 tu) 4 ](PF 6 ) 3 , has been synthesized by reduction of perrhenate with tin(II) chloride in strongly acidic solution in the presence of excess tetramethylthiourea. The complex has been characterized by elemental analysis and electronic and FTIR spectroscopy. The molecular structure of the compound was determined by X-ray diffraction methods. The coordination polyhedron is a regular square pyramid with the substituted thiourea sulfur atoms in the equatorial positions [d(Re±S) = 2.339(3) A Ê ] and the oxo ligand located in the summit [d(Re±O) = 1.63(2) A Ê ]. Computational methods were employed to analyze the geometric and electronic structures of tetramethylthiourea and thiourea. Quantum mechanical studies suggest steric hindrance as the reason for the stabilization of the ReO 3+ center instead of the Re III one.

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