Synthesis and crystal structure of a new mixed-ligand cluster [Mo3O4(C2O4)2bipy-(H2O)3]•EtOH•2H2O (bipy=2,2′-bipyridine)

The novel mixed-ligand neutral compound Mo3O4(C2O4)(2)center dot bipy(H2O)(3)]center dot EtOH center dot 2H(2)O (bipy = 2,2'-bipyridine) has been prepared by the reaction of oxalic acid elution of Mo(IV) and bipy, and characterized by single-crystal X-ray diffraction analysis and IR. The crystal is of triclinic, space groups P (1) over bar with a = 9.5520(2), b = 10.3730(1), c = 13.5722(2) angstrom, alpha = 74.940(12), beta = 80.772(14), gamma = 69.898(11)degrees, V = 1215.73(11) angstrom(3), Z = 2, C16H24Mo3N2O18, M-r = 820.19, D-c = 2.241 g/cm(3), mu = 1.616 mm(-1), F(000) = 808, T = 293(2) K, the final R = 0.0424 and wR = 0.0939 for 4119 observed reflections with I > 2 sigma(I). The trinuclear unit is coordinated by mixed ligands of oxalate and bipy. The intermolecular hydrogen bonding interactions among adjacent [Mo3O4(C2O4)(2)center dot bipy(H2O)(3)] extend the compound into a three-dimensional supramolecular framework. The uncoordinated water molecules and ethal molecules act as space-fillers and consolidate the whole architecture through hydrogen bonding interactions.