Two-dimensional square grid of neutral phosphonate ligands and eight-coordinated metal ions

摘要

Two dimensional coordination polymer [CdL2(NO3)2]_n(where L = 4,4'-bis(dimethylphosphonometh-yl)biphenyl) has been achieved. The crystal structure and molecular composition are measured using elemental analysis and X-ray crystal structure. Two-dimensional square grid was formed by semi-rigid phosphonate ligands bridge metals, in which the metals adopt rare eight-coordinated geometry. Weak C-H···O hydrogen bonds which between coordinated nitrate anion and methyl group of phosphonate ligands link two dimensional grids generating three dimensional supramolecular networks without interpenetration.