Springer Online Journal Archives 1860-2000
Abstract A series of ternary complexes of copper(II), cobalt(II) and zinc(II) with L-histidine, 1,10-phenanthroline, 2,2′-dipyridyl or imidazole having perchlorate or acetate as counterions were synthesized and characterized by conventional methods and for [Cu(bipy)(L-hist)]ClO4·1.5H2O and X-ray crystal structure was determined. The crystals belong to the monoclinic space groupC2 witha=18.843(3),b=10.582(2),c=11.020(2)Å, β=115.20(10)°,Z=4,R=0.0535. The structure is consistent of [Cu(bipy)(L-hist)]+ cations, perchlorate ions and water molecules. The geometry around copper is trigonal bipyramidal with one N,N′,O tridentate L-histidine molecule and one 2,2′-dipyridyl ligand, the apical sites are occupied by the α-amino nitrogen [Cu−N(71) 1.995(8)Å] and by N(11) of 2,2′-dipyridyl [Cu−N(11) 1.983(7)Å], the equatorial plane is formed by the N(3) imidazole δ-nitrogen [Cu−N(3) 2.140(6)Å], O(82) carboxylic oxygen [Cu−O(82) 2.009(5)Å] and N(22) [Cu−N(22) 2.010(7)Å].
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