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Investigating the Formation Mechanism of Arene Ruthenium Metallacycles by NMR Spectroscopy
Author(s) -
Garci Amine,
Gupta Gajendra,
Dalvit Claudio,
Therrien Bruno
Publication year - 2014
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201402639
Subject(s) - ruthenium , chemistry , lability , nuclear magnetic resonance spectroscopy , spectroscopy , stereochemistry , cis–trans isomerism , medicinal chemistry , catalysis , organic chemistry , physics , quantum mechanics
The stereochemical properties of twelve dinuclear arene ruthenium complexes have been studied in solution. The dinuclear complexes of the general formula [( p ‐cymene) 2 Ru 2 (OO∩OO)(L n ) 2 ](CF 3 SO 3 ) 2 (OO∩OO = oxalato, 2,5‐dioxido‐1,4‐benzoquinonato, 5,8‐dioxido‐1,4‐naphthoquinonato; L n = 4‐phenylpyridine, 4‐styrylpyridine, 4‐methylpyridine, 4‐ tert ‐butylpyridine) have been isolated as mixtures of the cis and trans isomers. All of the complexes showed lability of the pyridyl‐based ligands (L n ) in solution and rapid exchange between the cis and trans isomers. The equilibrium between the cis and trans isomers was confirmed by 1 H NMR spectroscopy, and the intermediate species were identified and, thus, provided valuable insights into the formation mechanism of arene ruthenium metalla‐assemblies.