| Abstract: Two new mononuclear dioxomolybdenum(Ⅳ) complexes with general formula [MoO2L(MeOH)], where L1 and L2 are the dianionic form of N'-(3-bromo-2-hydroxybenzylidene)-3,5-dimethoxybenzohydrazide and N'-(5-bromo-2-hydroxybenzylidene) isonicotinohydrazide, respectively, were prepared and structurally characterized by physico-chemical, spectroscopic methods and single crystal X-ray determination. The crystal of complex 1 crystallizes in monoclinic space group P21/n, with a=0.848 98(3) nm, b=2.275 4(1) nm, c=1.069 82(5) nm, β=109.108(1)°, V=1.952 8(1) nm3, Z=4, R1=0.036 7, wR2=0.084 0, S=1.027. The crystal of complex 2 crystallizes in triclinic space group P1, with a=0.655 05(9) nm, b=1.076 63(7) nm, c=1.303 3(1) nm, α=67.383(2)°, β=84.264(1)°, γ=76.195(2)°, V=0.823 9(1) nm3, Z=2, R1=0.071 3, wR2=0.151 0, S=1.004. X-ray analysis indicates that the Mo atom in each complex is in an octahedral coordination environment, constructed by two oxo groups and NO2 donor set of the hydrazone ligand, as well as a methanol O atom. The catalytic property of the complexes indicates that they are efficient catalysts for the oxidation of olefins. CCDC:1476621, 1; 1476622, 2. |
