Syntheses and structures of two novel inorganic-organic hybrid octamolybdates: [H2enMe]2[Mo8O26]·2H2O and [Ni(2,2′-bpy)3]2[δ-Mo8O26]

Two novel inorganic-organic hybrid octamolybdate complexes [H2enMe]2[Mo8O26]·2H2O 1 (enMe=1,2-diaminopropane) and [Ni(2,2′-bpy)3]2[δ-Mo8O26] 2 (2,2′-bpy=2,2′-bipyridine) have been hydrothermally synthesized and characterized by the elemental analyses, TG analyses, IR spectra, XPS spectra and the single-crystal X-ray diffraction. Crystal data for 1: Monoclinic, space group P21/n, a=7.9059(16) Å, b=17.415(4) Å, c=11.509(2) Å, β=109.93(3)°, V=1489.7(5) Å3, Z=2, and R1[I>2σ(I)]=0.0447. Crystal data for 2: Monoclinic, space group C2/c, a=19.987(4) Å, b=14.117(3) Å, c=25.435(5) Å, β=100.59(3)°, V=7054(2) Å3, Z=4, and R1[I>2σ(I)]=0.0280. Compound 1 contains left-handed and right-handed helical chains, which are built up from only molybdenum oxide building blocks and further interconnected to form the double helical chains. The [Ni(2,2′-bpy)3]2+ coordination complexes in compound 2 are packed together via the aromatic π-π stacking interactions and exhibit an interesting 3D honeycomb 'host' network with 1D channels, in which the octamolybdate anions 'guests' reside.