Two Polynuclear Complexes of Macrocyclic Oxamide with Cu(II) and Ni(II): Syntheses and Crystal Structures

Two oxamidato-bridged complexes with 2,2'-bipy or isophthalic acid co-ligand of formula [Cu2L(2,2'-bipy)(H2O)(ClO4)]ClO4 (1) and [Ni3L2(ipt)(H2O)]H2O (2) have been synthesized and structurally determined by X-ray diffraction, IR and fluorescence spectra. 1 crystallizes in the monoclinic system with P2(1)/n group, a=1.413 1(17) nm, b=1.091 7(13) nm, c=2.325 4(19) nm, beta=119.35(5)degrees, Z=4. 2 crystallizes in the monoclinic system with P2(1)/c group, a=1.159 7(2) nm, b=2.059 9(4) nm, c=1.847 7(4) nm, beta=90.788(3)degrees, Z=4. Complex 1 and 2 are binuclear and trinuclear metal complexes which are linked by oxamide ligand, and the polynuclear fragments are further joined into the 3D and 2D superamolecular framework through hydrogen bonds, respectively. CCDC: 796406, 1; 796405, 2.