One- and two-dimensional CdII coordination polymers incorporating organophosphinate ligands

Jeffrey A. Rood, Elizabethtown College
Steven Boyer, Elizabethtown College
Allen G. Oliver, University of Notre Dame


Reaction of cadmium nitrate with diphenylphosphinic acid in dimethylformamide solvent yielded the one-dimensional coordination polymer catena-poly[[bis(dimethylformamide-κO)cadmium(II)]-bis(μ-diphenylphosphinato-κ O:O′)], [Cd(C12H10O2P)2(C3H7NO)2] n , (I). Addition of 4,4′-bipyridine to the synthesis afforded a two-dimensional extended structure, poly[[(μ-4,4′-bipyridine-κ N:N′)bis(μ-diphenylphosphinato-κ O:O′)cadmium(II)] dimethylformamide monosolvate], {[Cd(C12H10O2P)2(C10H8N2)].C3H7NO} n , (II). In (II), the 4,4′-bipyridine molecules link the Cd centers in the crystallographic a direction, while the phosphinate ligands link the Cd centers in the crystallographic b direction to complete a two-dimensional sheet structure. Consideration of additional π-π interactions of the phenyl rings in (II) produces a three-dimensional structure with channels that encapsulate dimethylformamide molecules as solvent of crystallization. Both compounds were characterized by single-crystal X-ray diffraction and FT-IR analysis. 2 2 2 II II