Supramolecular hexagonal nano tubes assembled by vanadium diamine complexes with thiogermanates

Abstract

Although a lot of thiogermanates with transition metal amine complexes have been successfully synthesized, thiogermanates with vanadium complexes are largely unexplored. Two such new thiogermanates, {[V(en)₂]₂O}Ge₂S₆ (1) (en = ethylenediamine) and [VO(dap)₂]₂Ge₂S₆·dap (2) (dap = 1,2-diaminopropane), are now synthesized and characterized crystallographically. Compound 2 shows a supramolecular structure with hexagonal nano tubes assembled through N–H⋯S hydrogen bonds. The nano-tubes are further closely packed with strong N–H⋯O hydrogen bond interactions to form a honeycomb-like structure. Although the sulfur (S)–amine systems are common in the synthesis of chalcogenidometalates, the results of this work give a new demonstration of amine induced variation in molecular structures and the valance state of vanadium, though the two amines are only different by a branched methyl group.