Study of Conversion of Polymeric Organophosphorus Ylide Complexes of Mercury(ii) Halides to Phenazine Complexes: X-RAY Crystal Structures and Spectral Characterizations

Reaction of the salt 1 with an appropriate base gave the free ligand, Ph 3 P = C(H)C(O)PhNO 2 ( 2 ). The reactions of ligand 2 with mercury(II) halides form the C-coordinated polymeric complexes [( 2 )HgX 2 ] n {X = Cl ( 3 ), Br ( 4 ), I ( 5 )}.

Reactions of benzo[ a ]quinoxalino[2,3- c ]phenazine ligand (L) with complexes 3 , 4 and 5 cause the removal of ylidic ligand and lead to the formation of a new set of mononuclear mercury halides complexes {[(L)HgCl 2 ] ( 6 ), [(L)HgBr 2 ] ( 7 ) and [(L)HgI 2 ] ( 8 )} containing (L ) as a bidentate ligand. The structures of 4 and 6 were confirmed by single-crystal X-ray analysis. The structure of the products were identified by IR, 1 H and 31 P NMR spectral data and elemental analysis.