Three coordination polymers built by quaternary-ammonium-modified isophthalic acid

Abstract

Three coordination polymers based on quaternary-ammonium-modified isophthalic acid, namely, catena-poly[[[aqua-μ2-bromido-di-μ3-hydroxido-methanoldinitratotetracopper(II)]-bis{μ4-5-[2-(tripropylazaniumyl)ethoxy]benzene-1,3-dicarboxylato}] nitrate], {[Cu4Br(C19H28NO5)2(NO3)2(OH)2(CH4O)(H2O)]NO3} n , 1, poly[μ3-bromido-μ2-bromido-bromido-μ3-hydroxido-{μ4-5-[2-(tripropylazaniumyl)ethoxy]benzene-1,3-dicarboxylato}tricopper(II)], [Cu3Br3(C19H28NO5)(OH)] n , 2, and poly[bromido{μ3-5-[2-(tripropylazaniumyl)ethoxy]benzene-1,3-dicarboxylato}zinc(II)], [ZnBr(C19H28NO5)] n , 3, were obtained by solvothermal reactions. Coordination polymer (CP) 1 contains tetranuclear Cu4 units, in which the four Cu atoms are linked by two μ3-OH− groups into a Cu4(OH)2 cluster, which are in turn linked by 5-[2-(tripropylazaniumyl)ethoxy]benzene-1,3-dicarboxylate (cpa−) ligands into a chain structure. CP 2 also contains a tetranuclear Cu4(OH)2 cluster and these are linked with CuBr3 units into chains. The chains are then connected by cpa− ligands into a two-dimensional layered structure. CP 3 contains a two-dimensional layer structure built by binuclear Zn2 units and cpa− ligands. The Br− counter-anions of the quaternary ammonium groups all take part in the construction of the polymeric networks.