New O‐centered titanium chalcohalide: synthesis and structure of Ti4O(Se2)4Br6

Abstract

AbstractNew O‐centered tetranuclear titanium complex Ti4O(Se2)4Br6 has been prepared from TiSe1.73, Se, SeO2 and Br2 at moderate temperature by ampule synthesis. Its X‐ray crystal structure (monoclinic space group P21/c, a=9.4850(2), b=11.4667(2), c=19.1413(5)Å, β=92.0080(10)°, Z=4, V=2080.56(8)Å3) includes molecular complex Ti4O(Se2)4Br6 based on fragment {Ti4(μ4‐O)} coordinated by diselenide (Se2)2− and bromide bridging ligands. Ti4O(Se2)4Br6 is a new member of family of O‐centered tetranuclear complexes with the fragment {M4(μ4‐O)(Q2)4} (M=Ti, Nb, Ta; Q=S, Se, Te); here we discuss its synthetic features, crystal and electronic structure.