Synthesis and crystal structure of the copper(II) complex with tris-(1, 10-phenanthroline-5,6-dione)

The title complex [CuL3](ClO4)(2). 2H(2)O . 2CH(3)CN (L = 1,10-phenanthroline-5,6-dione) has been synthesized and characterized by elemental analysis, conductivity, infrared and UV-Vis spectra. X-ray diffraction analysis at room temperature indicates that the complex (C40H28Cl2CuN8O16, M-r = 1011.14) crystallizes in orthorhombic system, space group P2(1)2(1)2(1) with a = 13.983(1), b = 14.310(1), c = 20.890(2) Angstrom, V = 4179.7(6) Angstrom (3), Z = 4, D-c = 1.607 g/cm(3) F(000) = 2026, mu (MoK alpha) = 0.736 mm(-1). The final R and wR factors are 0.0446 and 0.1212 respectively with 8545 independent reflections. The title complex is composed of a discrete [CuL3](2+) cation, uncoordinated ClO4- anions, H2O and CH3CN molecules. The central Cu(II) atom is six-coordinated by six nitrogen donors of three ligands. The coordination geometry of Cu(II) could be considered as an approximately ideal octahedral configuration with little static Jahn-Teller distortion (the longest and shortest Cu - N bonds are 2. 102 vs 2.139 Angstrom with the mean length of 2.122 Angstrom), which is very rare for a six-coordinated Cu(II) complex.