First ferrocenylstibines and their molecular structures

Stibines Ph2SbFc containing the pendant arm [2-(Me2NCHR)] [where R = H(1) or Me(2)] on ferrocenyl ring were synthesized, and reaction of (1) with CH3I was carried out to obtain the monoammonium salt {[2-(Me3N+CH2)Fc]} SbPh2[I]−. All new stibines have been characterized by various physicochemical techniques. The structures of all these 1,2-disubstituted ferrocenylstibines were determined by X-ray diffraction analyses. This is the first report on the stibines containing disubstituted ferrocenyl group and it is worth mentioning that even monosubstituted ferrocenylstibines are virtually unknown. Heterobimetallic stibine (1) does not show intramolecular Sb–N interactions while the stibine (2) is stabilized by intramolecular Sb–N interactions.