SYNTHESIS AND MOLECULAR-STRUCTURES OF COMPLEXES OF BISMUTH(III) NITRATE WITH TRIDENTATE LIGANDS - 2,6-BIS(-CH2-P(=O)R(2)) SUBSTITUTED PYRIDINE-N-OXIDES

The two trifunctional ligands 2,6-(Ph(2)P(=O)-CH2)(2)C5H3NO (1) and 2, 6[(EtO)(2)P(=O)-CH2]2C5H3NO (2) were prepared by Arbuzov reactions on 2,6-bis (chloromethyl)pyridine with Ph(2)POMe and triethylphosphite, r espectively, and characterized by spectroscopic methods and X-ray stru ctural analysis (1). Their coordination chemistry with Bi(NO,), was st udied. The complexes Bi(NO3)(3) . 1 . DMF and Bi (NO3)(3) . 2 were iso lated and their X-ray structures determined. In both cases, the ligand s bind in a tridentate fashion to Bi-III, and the nitrate ions remain in the inner coordination sphere. Structural features of the unbound a nd bound ligand 1 are discussed.