Synthesis and X-ray crystal analysis of [Cu-2(HCOO)tpmc]-[Cu-2(CH3COO)tpmc](ClO4)(6)center dot 6H(2)O (tpmc = N,N ,N ,N -tetrakis-(2-pyridylmethyl)-1,4,8,11-tetraazacyclotetradecane). Preparation and characterization of [Cu-2(HCOO)tpmc](ClO4)(3)center dot H2O

The new structure of [Cu-2(HCOO)tpmc][Cu-2(CH3COO)tpmc](ClO4)(6)-6H(2)O (tpmc=N,N , ,N -tetrakis(2-pyridylmethyl)-1,4,8,11- tetraazacyclotetra-decane), consists of [Cu-2(HCOO)tpmc](3+) and [Cu-2(CH3COO)tpmc](3+) cations, perchlorate anions and water of crystallization. Two different binuclear transition metal complexes with the tpmc ligand form the same crystal lattice giving the monocrystals. The crystal structure of this compound has been solved by single crystal X-ray diffraction studies. It crystallizes in the triclinic system, space group P (1) over bar with a = 14.176(3) Angstrom, b = 16.864(4) Angstrom, c = 20.681(3) Angstrom, alpha = 100.68(3)degrees, beta = 101.00(3)degrees, gamma = 101.37-(3)degrees, V = 4628.6(16) Angstrom (3), R = 0.0729. Each copper atom is penta-coordinated in a distorted square-pyramidal arrangement. In addition, [Cu-2)(HCOO)tpmc](ClO4)(3).H2O was prepared and its properties were compared with the previously described mu -acetato analogue