Ferrocene as a ferromagnetic coupler. Synthesis and characterization of a ferrocene bridged polychlorotriphenylmethyl diradical

A polychlorotriphenylmethyl diradical connected by a 1,1′-ferrocenylendivinylene bridge has been synthesized and characterized. ESR frozen solution experiments down to helium temperature showed that the organometallic unit acts as a ferromagnetic coupler. This fact was supported by ZINDO/1 semiempirical calculations, which showed that the two singly occupied molecular orbitals (SOMOs) are non disjoint in addition to be almost degenerated.