Infrared spectra and structure of bridging carbonyls in Fe 2Ru(CO) 12 and Fe 3(CO) 12

Abstract

IR spectra of crystal, solution and pseudo-gas phases (argon and nitrogen matrices) of Fe 2Ru(CO) 12 and of crystal and solution phases of Fe 3(CO) 12 were recorded. By quantitative data-handling procedures, structures and bond angles for bridging carbonyls were estimated. Fe 2Ru(CO) 12 in crystal has a bridging structure analogous to that of Fe 3(CO) 12, with two bridged carbonyls and C 2 v or pseudo- C 2 v symmetry. In solution, both samples contain the same carbonyl bridged structure of C 2 v symmetry,just as in pseudo- gas phase; the latter, however, contains other bridged molecules of unknown structures, too.