Synthesis, characterization and crystal structure of [Ni(DACH)(2)](H2O)(2)(CH3COO)(2) (DACH=1,4-diazacycloheptane): a three-dimensional (3-D) hydrogen-bonded network embodying 1-D water chains

摘要

The mononuclear complex [Ni(DACH)(2)](H2O)(2)(CH3COO)(2) (DACH = 1,4-diazacyclo-heptane) has been synthesized and characterized by IR, UV-Vis, elemental analysis and single crystal X-ray diffraction. The complex crystallizes in monoclinic system, P2(1) space group with a=7.500(3) angstrom, b=8.788(3) angstrom, c=16.429(6) angstrom, beta=93.395(5)degrees, D-c =1.269 g cm(-3), mu=0.930 mm(-1), V=1080.9(6) angstrom(3), Z=2. The central Ni-II atom is in a square-planar coordination geometry formed by four N atoms of two DACH chelated ligands. The notable feature of the title compound resides in the formation of a three-dimensional network through hydrogen bonds between the [Ni(DACH)(2)](2+) cations, the CH3COO- counter anions and the guest water molecules trapped in the crystal lattice.