| Abstract |
The complexes [Co(HL2)(2)]center dot H2O center dot 3CH(3)OH (3), [Ni(HL1)(2)]center dot 4H(2)O center dot CH3OH (4) and [Ni(HL2)(2)]center dot 4H(2)O center dot CH3OH (5) with 4-((2-hydroxybenzyl)amino)-1,5-dimethyl-2-phenyl-1H-pyrazol-3(2H)-one (H2L1, 1) and 4-((5-bromo-2-hydroxybenzyl)amino)-1,5-dimethyl-2-phenyl-1H-pyrazol-3(2H )-one (H2L2, 2) ligands were synthesized and characterized by elemental analysis, ESI-MS, IR spectroscopy and X-ray single-crystal analysis. Compounds 1 and 2 were prepared by the Schiff condensation of 4-aminoantipyrine and salicyl-aldehyde or its 5-bromo-derivative with subsequent reduction. 1 and 2 were characterized by elemental analysis, ESI-MS, IR, H-1 and C-13 NMR spectroscopies. All the complexes 3-5 have a metal-to-ligand ratio of 1:2, the ligands being coordinated in the ONO mode, while the Co(II) and Ni(II) ions display a distorted octahedral geometry. In the solid state, 3-5 are arranged as 1D supramolecular chains through H-bonded water-methanol clusters placed in the voids of the metal-organic units. Crown Copyright (c) 2012 Published by Elsevier Ltd. All rights reserved. |
