Synthesis and Crystal Structure of a New 2D O-bridged Copper(II) Coordination Polymer Constructed from Sulfonate-derived Schiff Base

A new chain-like coordination polymer, namely, [CuL](n) (1, Na2L = 2-[(2-hydroxy-benzylidene)-amino]-benzenesulfonic acid sodium salt), has been synthesized and characterized by single-crystal X-ray diffraction, IR spectroscopy and elemental analysis. Complex 1 crystallizes in monoclinic system, space group P2(1)/c with a = 9.2296(16), b = 10.4754(18), c = 12.200(2) angstrom, beta = 102.392(2)degrees, V = 1152.0(3) angstrom(3), C13H9CuNO4S, M-r = 338.83, D-c = 1.953 g/cm(3), Z = 4, F(000) = 684, mu = 2.089 mm(-1), the final R = 0.0376 and wR = 0.0956. X-ray diffraction analyses indicate that 1 displays a square-pyramidal metal center with NO4 donor sets. The sulfonate-derived Schiff base serves as a common N,O,O'-tridentate and a unique O-bridged ligand connecting the metals. Dinuclear copper complexes serve as secondary building blocks (SBUs) to construct an unusual 2D coordination network. In the crystal, the components form a stable 3D supramolecular architecture by C-H center dot center dot center dot O interactions and pi-stacking.