|
Dioxobis(sub.-salicylaldiminato) molybdenum (Ⅵ) complexes, MoO2 (X-sal-N-R)2, (X = H, 5-CH3, R = C6H5, p-F-C6H4, m-Cl-C6H4, p-I-C6H4 and p-C2H5-C6H4), have been prepared by reactions of dioxobis(sub.-salicylaldehydato) molybdenum (Ⅵ), MoO2(X-sal)2 with primary amines, in which MoO2(X-sal)2 complexes were obtained by acidification of a mixture solution of ammonium paramolybdate in water and appropriate salicylaldehyde in methanol. All these complexes show two strong Mo=O stretching imodes in the 900-940cm-1 and p.m.r. spectra exhibited only one signal for the azomethine group. These results confirmed that the complexes are six-coordinated octahedron with a cis-MoO2 group and the geometrical configurations of the complexes possess a C2 axis of symmetry. From the mass analyses of the complexes, it found that the composition ratios of MoO2 : ligand are 1 : 2. The charge transfer transition corresponding to N-Mo, and O-Mo occured at 29,000cm-1 and 32,000cm-1 respectively. Where, the complexes were found to be non-ionic materials by conductivity measurements in dimethylformamide.
|