SYNTHESE ET ETUDE SPECTRALE UV DE CHAINES POLYMETALLEES (Ge, Si); ANALYSE THEORIQUE DES EFFETS DE SUBSTITUTION

Article abstract of DOI:10.1016/S0022-328X(00)98750-3

An UV study of polymetallic chains of Group IVB elements (Ge, Si) was developed.The studied polygermanes and polygermasilanes were mainly synthetized either by reaction of organolithium with organochlorogermanes or by a Wuetz type reaction.An enhanced λ_max value for UV absorption of the chromophore Ge-Ge in these polymetallic compounds is observed in alkyl substitution at the metal by phenyl groups or halogen and also when the polymetallic chain is lengthened.A theoretical approach of these phenomena is proposed based on excitonic coupling between phenyl and metallic chain transition moments.