Zinc(II) Phosphonate Cage Compounds Derived from Zn6(Zn)L6 Centered Octahedral Cores

Three zinc(II) phosphonate cluster compounds have been hydrothermally synthesized and structurally characterized. Compound 1 consists of a centered {Zn6(Zn)L6}4− core and two {Zn(Phen)2(H2O)2}2+ countercations (L = N-(phosphonomethyl)pipecolinic acid, O3PCH2−NC5H9−CO2). The {Zn6(Zn)L6}4− core in compound 2 or 3 is covalently bonded to two Zn(H2O)42+ or {Zn(2,2′-bipy)(H2O)3}2+ cations through the coordination of two additional carboxylate oxygen atoms to form a nonanuclear cluster.