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Intramolecular Dynamics of Tetranuclear Iridium Carbonyl Cluster Compounds. Part III . Crystallographic and dynamic evidence for the intermediate of the ‘merry‐go‐round’ process in nonacarbonyl‐μ 3 ‐(1,3,5‐trithiane)‐tetrairidium
Author(s) -
Suardi Gianfranco,
Strawczynski Andres,
Ros Renzo,
Roulet Raymond,
Grepioni Fabrizia,
Braga Dario
Publication year - 1990
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.19900730117
Subject(s) - chemistry , intramolecular force , iridium , crystallography , endothermic process , tetrahedron , cluster (spacecraft) , redistribution (election) , stereochemistry , ligand (biochemistry) , organic chemistry , catalysis , receptor , biochemistry , adsorption , politics , computer science , law , political science , programming language
The title complex crystallises in two C 3v , isomeric forms differing in carbonyl‐ligand arrangement. In solution, the isomer 1b with three edge‐bridging carbonyls on a common face of the metal tetrahedron converts via an endothermic equilibrium into the isomer 1u with no bridging carbonyls. The latter was shown by 13 C‐NMR to be the intermediate of the ‘merry‐go‐round’ process which exchanges the sites of the basal CO's.