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Synthesis, Characterization, and Crystal Structure of [ReO(Me 4 tu) 4 ](PF 6 ) 3 (tu = thiourea)
Author(s) -
Gambino Dinorah,
Kremer Eduardo,
J. Baran Enrique,
Mombrú Alvaro,
Suescun Leopoldo,
Mariezcurrena Raúl,
Kieninger Martina,
N. Ventura Oscar
Publication year - 1999
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/(sici)1521-3749(199905)625:5<813::aid-zaac813>3.0.co;2-0
Subject(s) - thiourea , chemistry , square pyramid , steric effects , crystallography , perrhenate , tin , stereochemistry , crystal structure , rhenium , inorganic chemistry , organic chemistry
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) Å] and the oxo ligand located in the summit [d(Re–O) = 1.63(2) Å]. 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.