Theoretical studies on the high-spin binuclear cyclopentadienyliron derivatives Cp₂Fe₂(CN)_n(Cp = η⁵-C₅H₅;n= 6, 5, 4, 3, 2, 1)

Abstract

Theoretical studies on the cyclopentadienyliron derivatives Cp 2 Fe 2 (CN) n (Cp = η 5 -C 5 H 5 ; n = 6, 5, 4, 3, 2, 1) indicate that high-spin species with terminal Cp rings and bridging cyanide ligands up to a maximum of two bridges are predicted to be the lowest energy structures, which are paramagnetic complexes. Cp 2 Fe 2 (CN) 3 and Cp 2 Fe 2 (CN) 2 appear to be relatively stable with respect to dissociation of a cyanide ligand, while the binuclear derivatives Cp 2 Fe 2 (CN) n (n = 6, 5, 4, 3) are all more stable than the mononuclear fragments.