Hydrothermal syntheses and crystal structures of two hybrid materials constructed from polyoxometalate clusters and metal–dipyridine complexes

Two organic–inorganic hybrid microporous compounds with formulas (4,4′-bipy)2[Cu(4,4′-bipy)2{Mo5P2O21(OH)2}]2(H3O)·3(H2O) 1 and (4,4′-bipy)0.5[Cu1.5(4,4′-bipy)4{Mo5P2O21(OH)2}](H3O)·2(H2O) 2 have been hydrothermally prepared and characterized by single-crystal X-ray diffraction. Compound 1 crystallizes in a monoclinic system with space group C2/c (no. 15), a = 17.667(3) Å, b = 13.669(3) Å, c = 25.067(5) Å, β = 107.479(3)°, V = 5774.2(18) Å3, and Z = 4. Compound 2 crystallizes in a monoclinic system with space group P21/n (no. 14), a = 13.9590(5) Å, b = 22.4850(7) Å, c = 19.1568(6) Å, β = 97.778(2)°, V = 5957.4(3) Å3, and Z = 4. Compound 1 is three-dimensional (3D), constructed from {Mo5P2O21(OH)2}4− cluster anions bridged through [Cu(4,4′-bipy)2]n2n+ layer sheets. In contrast, compound 2 is also three-dimensional, resulting from a complex connectivity pattern among {Mo5P2O21(OH)2}4− cluster anions, [Cu(4,4′-bipy)2]n2n+ layer sheets and [Cu(4,4′-bipy)4]n2n+ complex subunits. Other characterizations by elemental analysis, IR, thermal analysis, and magnetic properties for the compounds are also given.

Graphical abstractTwo organic–inorganic hybrid microporous compounds have been hydrothermally prepared and characterized by single-crystal X-ray diffraction. Compound 1 is three-dimensional, constructed from {Mo5P2O21(OH)2}4− cluster anions bridged through [Cu(4,4′-bipy)2]n2n+ layer sheets. In contrast, compound 2 is also three-dimensional, resulting from a complex connectivity pattern among {Mo5P2O21(OH)2}4− cluster anions, [Cu(4,4′-bipy)2]n2n+ layer sheets and [Cu(4,4′-bipy)4]n2n+ complexes subunits.Figure optionsDownload full-size imageDownload as PowerPoint slide