Synthesis and crystal structure of a novel 2D Cadmium(II) complex constructed from N-(3-Carboxyphenyl)-4,4'-bipyridinium and Benzene-l,4- dicarboxylic acid

A novel redox-active bipyridinium ligand N-(3-carboxyphenyl)-4,4'- bipyridinium chloride (HCPBPyCl) and its coordination polymer {[Cd ₂(CPBPy) ₂(BDC)(H ₂O) ₂Cl ₂]·6H ₂O} _n 1 (H ₂BDC = benzene-1,4-dicarboxylic acid) were synthesized and characterized. Crystallographic data for 1: C ₄₂H ₄₄Cd ₂Cl ₂N ₄O ₁₆, M _r = 1156.51, monoclinic, space group C2/c, a = 21.046(3), b = 11.0036(15), c = 20.012(3) Å, β = 98.694(8)°, Z = 4, V= 4581.1(11) Å ³, D _c = 1.677 g/cm ³, F(000) = 2280 and μ = 1.120 mm ^-1. Complex 1 possesses a thick and undulated two-dimensional layer with (6,3) topology, which interpenetrates with two others (above and below) to extend into a three-dimensional supramolecular framework.