Collect. Czech. Chem. Commun. 1997, 62, 1710-1720

Complexes of Mercury(II) with Tetraethyl 2,2'-Bipyridyl-4,4'-diphosphonate

Pavel Vojtíšek, Jan Rohovec and Ivan Lukeš

Department of Inorganic Chemistry, Charles University, 128 40 Prague 2, Czech Republic


Complexes [Hg(bipyP2)Br2] (2), [Hg(bipyP2)BrCl] (3), and [Hg(bipyP2)Cl2] (4), where bipyP2 is tetraethyl 2,2'-bipyridyl-4,4'-diphosphonate (1), were prepared and their crystal structures were determined. Coordination of the phosphonate group was only found in 4. In this compound, the coordination sphere of Hg(II) contains two Cl atoms, two N atoms from the bipyridine chelate and O atom from phosphonate group and thus, the coordination number is five. The presence of Br atoms in the coordination sphere of complexes 2 and 3 results in the formation of tetrahedral environment (coordination number four) without any interaction with phosphonate. The coordination of the phosphonate group in 4 was also confirmed by IR spectroscopy.

Keywords: Chelates; Phosphonates; Bipyridines; Complexes of Hg(II); Complexes of substituted 2,2'-bipyridine; X-Ray diffraction; IR spectroscopy; NMR spectroscopy.