Synthesis, structure and properties of oxocyanido W(IV) complexes with substituted salicylaldimines of 2-aminoethanol compared to Mo(IV) analogs

A series of W(IV) complexes with 2-aminoethanol and 5-bromo-, 5-chloro-, 5-methoxy-, 3,5 -dichloro-substituted salicylaldehydes is described. The complexes were isolated and characterized by elemental analysis, IR and UV–Vis spectroscopy as well as cyclic voltammetry. The single crystal X-ray analysis of salt (PPh4)2[W(CN)3O(metsal)]·5H2O (where metsal = Schiff bases formed in situ in the reaction of aminoethanol and 5-methoxysalicylaldehyde) indicate a distorted octahedral geometry of the anions with Hmetsal as N,O-donating ligand. The isolated salts of W(IV) are compared to Mo(IV) analogs.

A series of W(IV) Schiff base ligand complexes were obtained in reaction of [W(CN)4O2]4− with 2-aminoethanol and 5-bromo-, 5-chloro-, 5-methoxy-, 3,5-dichloro-substituted salicylaldehydes. In case of 3,5-dichlorosalicylaldehyde, the complex only with salicylaldehyde was obtained. The salts were isolated and characterized by elemental analysis, IR and UV–Vis spectroscopy and cyclic voltammetry. Results were compared to molybdenum analogs.Figure optionsDownload as PowerPoint slide