Zur Elektronenstruktur hochsymmetrischer Verbindungen der f‐Elemente. 45[1]Ungewöhnliche spektrochemische Eigenschaften des Triphenylphosphanoxido‐Liganden im Falle von Mono‐ und Bisaddukten homoleptischer Samarium(III)silylamide

Abstract

AbstractThe optical spectra of the mono tetrahydrofuran (1), mono triphenylphosphinoxide (2) and bis cyclohexylisocyanide (3) adducts of the tris(bis(trimethylsilyl)amido)samarium(III) (Sm(btmsa)3) moiety as well as those of the bis tetrahydrofuran (4) and partly those of the bis triphenylphosphinoxide (5) of the tris(bis(dimethylsilyl)amido)samarium(III) moiety have been recorded at room and low temperatures. From the spectra obtained, the underlying crystal field splitting patterns could be derived, and simulated by fitting the free parameters of a phenomenological Hamiltonian. The values of the crystal field parameters B$\rm^{2}_{0}$ of the OPPh3 adducts are much less negative than those of the remaining adducts or that of the base free compound.