Syntheses and structures of two copper–molybdate complexes: The 3-D [Cu(4,4′-bpy)(MoO4)] and 1-D [Cu2(HDABCO)2(H2Mo8O27)] · 4H2O

Hydrothermal reaction of molybdenum oxide and copper(II) source in the presence of 4,4′-bipyridine (4,4′-bpy) afforded three-dimensional covalent framework [CuII(4,4′-bpy)(MoO4)] (1), while reaction with 1,4-diazoniabicyclo[2,2,2]octane (DABCO) in place of 4,4′-bpy and addition of metal molybdenum resulted in one-dimensional chain-like compound [Cu2I(HDABCO)2(Mo8(OH)2O25)]·4H2O(2). The copper in 1 is divalent and approximately shows trigonal bipyramidal geometry, while in 2 is monovalent and approximately shows T-shaped geometry. The structure of 1 has a three-dimensional pillar-layered framework constructed from bimetallic {CuMoO4} layers bridged by bifunctional ligand 4,4′-bpy. Interestingly, the {CuMoO4} layer in 1 consists of 16-membered {Cu4Mo4O8} rings and 8-membered {Cu2Mo2O4} rings, different from other reported {CuMoO4} layers. The structure of 2 consists a one-dimensional {H2Mo8O27}n4n- chain that is attached by peripheral {Cu(HDABCO)}2+ units. The {H2Mo8O27}n4n-chain is constructed from octamolybdates through common corners.

Hydrothermal reaction of molybdenum source, copper(II) source and organic amines generated three-dimensional covalent framework [CuII(MoO4)(4,4′-bpy)] (1) and one-dimensional chain-like compound [Cu2I(HDABCO)2(H2Mo8O27)]·4H2O(2).Figure optionsDownload as PowerPoint slide