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An Organogold(III) Difluoride with a trans Arrangement
Author(s) -
PérezBitrián Alberto,
Baya Miguel,
Casas José M.,
Martín Antonio,
Menjón Babil,
Orduna Jesús
Publication year - 2018
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201802379
Subject(s) - chemistry , difluoride , halide , cyanide , dissociation (chemistry) , cyanation , crystallography , fluoride , metal , yield (engineering) , stereochemistry , inorganic chemistry , catalysis , organic chemistry , materials science , metallurgy
The trans isomer of the organogold(III) difluoride complex [PPh 4 ][(CF 3 ) 2 AuF 2 ] has been obtained in a stereoselective way and in excellent yield by reaction of [PPh 4 ][CF 3 AuCF 3 ] with XeF 2 under mild conditions. The compound is both thermally stable and reactive. Thus, the fluoride ligands are stereospecifically replaced by any heavier halide or by cyanide, the cyanide affording [PPh 4 ][ trans ‐(CF 3 ) 2 Au(CN) 2 ]. The organogold fluoride complexes [CF 3 AuF x ] − ( x =1, 2, 3) have been experimentally detected to arise upon collision‐induced dissociation of the [ trans ‐(CF 3 ) 2 AuF 2 ] − anion in the gas phase. Their structures have been calculated by DFT methods. In the isomeric forms identified for the open‐shell species [CF 3 AuF 2 ] − , the spin density residing on the metal center is found to strongly depend on the precise stereochemistry. Based on crystallographic evidence, it is concluded that Au iii and Ag iii have similar covalent radii, at least in their most common square‐planar geometry.