Ni(II) complexes with pyrazole-derived ligands. Crystal structures of [Ni(HL0)2ClH2O][Ni(HL0)(H2O)2]Cl3·CH3OH·H2O and [Ni(HL1)(H2O)2] Br2·2.5DMF

Josefina Pons, Arafa Chadghan, Jaume Casabó, Angel Alvarez-Larena, Joan Francesc Piniella, Xavier Solans, Mercè Font-Bardia, Josep Ros

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27 Citations (Scopus)

Abstract

The reaction of 3-phenyl-5-(2-pyridyl)pyrazole (HL0) and 3-phenyl-5-(6-methyl-(2-pyridyl))pyrazole (HL1) with nickel(II) salts produces mononuclear coordination compounds. The new complexes have been characterised by elemental analyses, conductivity measurements and infrared and electronic spectroscopies. Two different forms of mononuclear nickel(II) complexes have been prepared and structurally characterised by X-ray crystallography: [Ni(HL0)2Cl(H2O)][Ni(HL0) 2(H2O)2]Cl3 ·CH3OH·H2O and [Ni(HL1)2(H2O)2] Br2·2.5DMF. In the cationic complexes, the coordination of the Ni(II) is octahedral with two bidentate HL0 or HL1 neutral ligands in a cis disposition. The degree of distortion from regular octahedral geometry is compared to closely related structures. In the solid state, cations and anions are bonded by hydrogen bonding. © 2001 Elsevier Science Ltd. All rights reserved.
Original languageEnglish
Pages (from-to)1029-1035
JournalPolyhedron
Volume20
Issue number9-10
DOIs
Publication statusPublished - 30 Apr 2001

Keywords

  • Crystal structures
  • Nickel complexes
  • Pyrazole

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Dive into the research topics of 'Ni(II) complexes with pyrazole-derived ligands. Crystal structures of [Ni(HL<sup>0</sup>)<sub>2</sub>ClH<sub>2</sub>O][Ni(HL<sup>0</sup>)<sub>2 </sub>(H<sub>2</sub>O)<sub>2</sub>]Cl<sub>3</sub>·CH<sub>3</sub>OH·H<sub>2</sub>O and [Ni(HL<sup>1</sup>)<sub>2 </sub>(H<sub>2</sub>O)<sub>2</sub>] Br<sub>2</sub>·2.5DMF'. Together they form a unique fingerprint.

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