Cu(II) complexes with pyrazole-derived ligands. Crystal structure of {[diaquanitrato(3-phenyl-5-(2-pyridyl)pyrazole)]copper(II)} nitrate

Josefina Pons, Arafa Chadghan, Jaume Casabó, Angel Alvarez-Larena, Joan Francesc Piniella, Josep Ros

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Abstract

Reaction of the ligands 3-phenyl-5-(2-pyridyl)pyrazole (HL0) and 3-phenyl-5-(6-methyl-(2-pyridyl))pyrazole (HL1) with Cu(NO3)2·3H2O and CuX2·xH2O (X= Cl, Br) gives complexes with stoichiometry Cu(HL0)2X2·xH2O, Cu(HL1)2X2·EtOH, Cu(HL)X2, Cu(HL)2(NO3)2·xH2O (HL = HL0, HL1) and Cu(HL0)(NO3)2·2H2O. The new complexes were characterised by elemental analyses, conductivity measurements and infrared and electronic spectroscopy. The crystal and molecular structure of [Cu(HL0)(NO3)(H2O)2](NO 3) consists of discrete cations and NO3- anions linked by hydrogen bonds. The cation complex [Cu(HL0)(NO3)(H2O)2]+ contains a copper(II) with a distorted tetragonal pyramid geometry (τ = 0.094), with a H2O ligand occupying the apical site. The penta-coordinated metal atom is bonded to one pyridinic nitrogen, one pyrazolic nitrogen, one nitrate and two water molecules. The ligand HL0 is not completely planar. © 2001 Elsevier Science Ltd.
Original languageEnglish
Pages (from-to)2531-2536
JournalPolyhedron
Volume20
Issue number19
DOIs
Publication statusPublished - 30 Aug 2001

Keywords

  • Copper complexes
  • Crystal structures
  • Pyrazole complexes

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