Collect. Czech. Chem. Commun.
2006, 71, 423-433
https://doi.org/10.1135/cccc20060423
Structure Dynamics and Isomerism of Bis[μ-(2-methylphenolato)]bis[(η2:η2-cycloocta-1,5-diene)rhodium(I)] Complex
Jiří Zedníka,*, Jan Sejbalb, Jan Svobodaa, Jan Sedláčeka and Jiří Vohlídala
a Department of Physical and Macromolecular Chemistry, Laboratory of Specialty Polymers, Charles University, Albertov 2030, CZ-128 40, Prague 2, Czech Republic
b Department of Organic Chemistry, Charles University, Albertov 2030, CZ-128 40, Prague 2, Czech Republic
Abstract
Dinuclear rhodium(I) complex [{RhI(cod)}2(μ-OC6H4-2-Me)2] (1), exhibits the syn-anti isomerism consisting in the orientation of methyl groups of the bridge ligands with respect to the plane or distorted plane involving Rh and O atoms. The syn isomer predominates in CDCl3 solution (above 90%) at room temperature. EXSY 1H NMR measurements showed that, in CDCl3 solution, complex 1 undergoes at least two independent dynamic processes differing substantially in values of activation parameters: (i) rotation of 2-methylphenyl rings in bridge ligands along the O-C axis, and (ii) formal rotation of cod ligands along the Rh-cod axes, which proves fluxional behavior of cod ligand in RhI(cod) complexes.
Keywords: Atom transfer radical polymerization; Dynamic NMR spectroscopy; Hydroformylation; syn-anti Isomerism; Polyacetylenes; Rhodium aryloxo complexes; Rhodium diene complexes; Rhodium dinuclear complexes.
References: 23 live references.
