Synthesis and crystal structure of one-dimensional heterotrimetallic coordination polymer {[(Dipic)2Cu]4 · Mg(H2O)2Na4(H2O)14} n · nNa2(H2O)10 · 2nCH3OH

Abstract

A novel heterotrimetallic complex {[(Dipic)2Cu]4 · Mg(H2O)2Na4(H2O)14n · nNa2(H2O)10 · 2nCH3OH (H2Dipic = pyridine-2,6-dicarboxylic acid) has been synthesized and structurally determined by X-ray diffraction method. The compound crystallizes in the triclinic system, space group P\(\bar 1\), with a = 13.5523(13), b = 14.1859(13), c = 14.3213(14) A, α = 62.6160(10)°, β = 68.2540(10)°, γ = 89.7110(10)°, V = 2224.7(4)A3, F(000) = 1144, Mr = 2237.70, Z = 1, ρc = 1.670 g cm−3, μ = 1.095 mm−1, final R = 0.0507, wR = 0.1418 for 8042 independent reflections with Rint = 0.0228. According to the structure determination, the complex is composed of novel one-dimensional (1D) alternating chains, dinuclear Na(I) units, and lattice methanol molecules. The infinite 1D chain structure is built up with many of polymeric [(Dipic)2Cu]4 · Mg(H2O)2Na4(H2O)14 units, which consists of four six-coordinated Cu2+ ions, one six-coordinated Mg2+ ion, two five-coordinated Na+ ions, and two six-coordinated Na+ ions. The 1D alternating chains are linked with another dinuclear Na(I) units by extensive hydrogen bonds to form a three-dimensional (3D) supramolecular structure in which uncoordinated methanol molecules act as space filling particles.