Synthesis and characterisation of nickel(II) complexes with tripodal ligand tris[4-(3-(5-methylpyrazolyl)-3-aza-3-butenyl] amine (MPz(3)tren): X-ray crystal structure of [Ni(MPz(3)tren)](BF4)(2)center dot 0.5H(2)O

摘要

Nickel(II) complexes of the tripodal ligand (MPz(3)tren) of the general formula [Ni(MPz(3)tren)]X-2.n H2O (X = Cl, Br, NO3, ClO4 and BF4; n = 0 for Cl and Br; n = 0.5 for NO3, ClO4 and BF4) have been prepared by template methodology and characterised by elemental analyses. magnetic susceptibility and conductivity measurements at RT, IR and electronic spectra. The molar conductivities measured in MeOH for all the complexes show them to be 1:2 electrolytes. The hexadentate character of the ligand in all the complexes is inferred from IR spectral studies. The electronic spectra in solid state and in MeOH solution suggest octahedral geometry for all the complexes. The structure of [Ni(MPz(3)tren)](BF4)(2).0.5H(2)O has been determined by single-crystal X-ray diffraction studies (monoclinic, c2/c). Nickel(II) is in a trigonal antiprismatic N-6 donor environment and the crystal structure is stabilised by a network of strong H-bonding. (C) 2000 Elsevier Science B.V. All rights reserved. [References: 34]