Imino-bis(diisopropylphosphine chalcogenide) complexes of arsenic, antimony and bismuth. Synthesis, CVD studies and X-ray structure of M[N(EPiPr2)2]n(E = Se, S; M = As, Sb, Bi)

Bismuth, and antimony complexes of imino-bis(diisopropylphosphine chalcogenide) ligands, M[N(EPiPr2)2]n(E = S or Se; M = Bi and Sb) have been prepared by the reaction of the sodium salt of NH(EPiPr2)2(E = S or Se) with the appropriate group 15 metal salt in methanol. The complexes are monomeric in the solid state and air stable. The crystal structures of Bi[(iPr2PS)2N]3 and Sb[(iPr2PS)2N]3 have been determined by X-ray diffraction. The compounds are isostructural, with distorted octahedral coordination geometries and extended P-Se bonds. The bismuth compounds have been used in both AA-MOCVD and LP-MOCVD to deposit thin films of bismuth chalcogenide.