The structures of dicarbonylcyclopentadienylruthenium dimer [{Ru(π-C5H5)(CO)2}2] and some related complexes in solution
- 1 January 1970
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc. A
- p. 2128-2132
- https://doi.org/10.1039/j19700002128
Abstract
The i.r. spectra of [{Ru(π-C5H5)(CO)2}2], (Ru I), and the new complexes [{Ru(π-MeC5H4)(CO)2}2], (Ru II), and [{Ru(π-indenyl)(CO)2}2], (Ru III), have been investigated between 1700 and 2100 cm.–1. They are best interpreted in terms of complex equilibria involving cis and trans, bridged (b)- and nonbridged (nb)-tautomers. The b–nb isomer ratio is dependent on substituents on the cyclopentadienyl ring, and variation in solvent, and temperature. The proportion of nb-species increases with increasing temperature, but declines along the series (Ru I) > (Ru II) > (Ru III), and heptane > carbon disulphide > xylene > chloroform > tetrahydrofuran > acetonitrile. There is no evidence for the presence of the nb-isomers in solutions of (Ru III) in any solvent at any temperature. The relative intensities of absorption bands due to either b- or nb-isomers do not vary appreciably with changes in ring substituent or temperature, but are affected by solvent for all three complexes.Keywords
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