Synthesis and characterization of four metal-organophosphonates with one-, two-, and three-dimensional structures

摘要

A series of metal-organic hybrid compounds were synthesized using two new phosphonic acids, pyridyl-4-phosphonic acid and p-xylylenediphosphonic acid (H2O3PCH2C6H4CH2PO3H2). The phosphonic acid ligands have been synthesized from their corresponding bromides following two different types of reactions. The reaction of pyridyl-4-phosphonic acid with three different divalent metal salts results in the formation of molecular structures of different dimensionality. The reaction of Cu(II) with the phosphonic acid under hydrothermal conditions yields a three-dimensional (3D) open framework structure having the molecular formula [Cu-4(NC5H4-PO3)(4)(H2O)(10)] (1). The reactions with Mn(II) and Zn(II) salts with the same phosphonic acid resulted in a two-dimensional layered and a dinuclear compound with molecular formulas [Mn-3(NC5H4-PO3)(4)(H2O)(6)(ClO4)(2)] (2) and [Zn-2(NHC5H4-PO3H)(2)Cl-4] (3), respectively. Compound 1 crystallizes in the triclinic crystal system having space group P