THE 1ST STRUCTURALLY CHARACTERIZED SILVER LANTHANIDE HETEROMETALLIC COMPLEX - SYNTHESIS AND CRYSTAL-STRUCTURE OF AG[GD(DIPIC)2(H2O)3].3H2O (WHERE H2 DIPIC = 2,6-PYRIDINEDICARBOXYLIC ACID)

Reaction of the silver(I) complex Ag(Hdipic)(H2dipic).H2O, where H2dipic = 2,6-pyridinedicarboxylic acid, with gadolinium(III) nitrate in aqueous methanol gave the heterometallic complex Ag[Gd(dipic)2(H2O)3].3H2O (1), which has been characterized by X-ray diffraction. Each gadolinium atom is nine-coordinate and has two tridentate dipic2- ions and three water molecules bonded in a tricapped trigonal prismatic geometry. The silver atoms bind to the carboxylate groups of both dipic ligands forming polymeric Gd-carboxyl-Ag-carboxyl-Gd chains.