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M−C Bond Homolysis in Coinage‐Metal [M(CF 3 ) 4 ] − Derivatives
Author(s) -
Baya Miguel,
JovenSancho Daniel,
Alonso Pablo J.,
Orduna Jesús,
Menjón Babil
Publication year - 2019
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201903496
Subject(s) - homolysis , homoleptic , chemistry , bond cleavage , metal , covalent bond , radical , aryl , photochemistry , crystallography , alkyl , organic chemistry , catalysis
Abstract A comparative study of the homoleptic [M(CF 3 ) 4 ] − complexes of all three coinage metals (M=Cu, Ag, Au) reveals that homolytic M−C bond cleavage is favoured in every case upon excitation in the gas phase (CID‐MS 2 ). Homolysis also occurs in solution by photochemical excitation. Transfer of the photogenerated CF 3 . radicals to both aryl and alkyl carbon atoms was also confirmed. The observed behaviour was rationalized by considering the electronic structure of the involved species, which all show ligand‐field inversion. Moreover, the homolytic pathway constitutes experimental evidence for the marked covalent character of the M−C bond. The relative stability of these M−C bonds was evaluated by energy‐resolved mass spectrometry (ERMS) and follows the order Cu