The [tetra(pyridinioacetato)copper]2+ as a tridentate chelate to alkaline-eearth metal cation:: Crystal structure of [Cu2Ca2(C5H5NCH2CO2)10(H2O)3](ClO4)8•H2O

A tetranuclear copper-calcium complex of pyridinioacetate (C5H5N+CH2CO2-), namely [Cu2Ca2(C5H5NCH2CO2)(10)(H2O)(3)](ClO4)(8).H2O was synthesized and characterized by X-ray crystallography. The complex crystallizes in triclinic, P (1) over bar (No. 2), a = 15.658(2), b = 18.260(2), c 18.456(2) Angstrom, alpha = 91.552(2), beta = 94.004(3), gamma = 104.928(2)gammadegrees, V = 5081(1) Angstrom(3), Z = 2. In the crystal structure, a square-planar [Cu(C5H5NCH2CO2)(4)](2+) entity uses three of its four carboxylate groups to chelate to a calcium atom forming a [CuCa(C5H5NCH2CO2)(4)](4+) dinuclear subunit, and a pair of such dinuclear subunits are linked by the two remaining pyridinioacetate ligands through the calcium atoms to furnish a tetranuclear [Cu2Ca2 (C5H5NCH2CO2)(10)(H2O)(3)](8+) cation.