Dimensionally controlled hydrogen-bonded nanostructures: synthesis, structure, thermal and magnetic behaviour of the tris(chelated)nickel(II) complex [Ni(bipy)(3)]Cl(2)(.)5.5H(2)O(bipy=2,2 '-bipyridyl)

摘要

Single crystals of the compound of formula [Ni(bipy)(3)]Cl(2)(.)5,5H(2)O (bipy = 2.2'-bipyridine) have been prepared and structurally characterised by X-ray diffraction, The structure analysis reveals that the complex has an approximate D-3 symmetry. The coordination sphere consists of six nitrogen atoms of the three-bipyridine ligands in an octahedral arrangement about the nickel. One of the chlorine ions is surrounded by twelve C-H... Cl hydrogen bonds. Three kinds of layers are found in the crystal structure: (i) the Lambda-[Ni(bipy)(3)](2+) cation, (ii) the water/chloride positions (O(1w)/Cl(21) to O(7w)/Cl(27)), (iii) the Lambda-[Ni(bipy)(3)](2+) cation and a chloride ion (Cl(l)). The layers are stacked in the order (i), (ii) (iii) and (ii) almost parallel to the ab-plane. A thermogravinietric analysis shows that the water and chloride molecules were removed at 231 degreesC leading to the compound [Ni(C25H19N5)]((s)) according to elemental analysis and IR data. The plot of 1/chi(M) versus T in the range 2.0-300 K obeys the Curie law. (C) 2002 Published by Elsevier Science B.V. [References: 45]