Amine-templated metal squarates

Abstract

Two layered amine-templated cobalt squarates, [C6N2H14](2)[Co-2(C4O4)(3)(H2O)(4)], I, and [C3N2H5](2)[CO2(C4O4)(3)(H2O)(4)], II, have been prepared under hydrothermal conditions. Both I and II contain chains formed by dimers comprising two cobalt atoms bound to the squarate units, the chains being connected through hydrogen bond interactions. An amine-templated cobalt squarate of the formula [C4N2H12][CO(C4O4)(2)(H2O)(4)][H2O](2), III, as well as its Ni, Zn and Cd analogues have been prepared by room temperature reactions. III has a layered architecture wherein the cobalt-squarate monomers are linked by the amine molecules. Co and Zn analogues of [Ni(C4O4)(H2O)(2)(C3N2H4)] with ligating imidazole units have also been prepared and characterized. (C) 2003 Elsevier Science (USA). All rights reserved.