The effect of HCL on the copper(II) chloride/pyridine/water system: Synthesis, properties and crystal structure of [(pyH)2CuCl4] and [(pyH)2Cu3Cl8(H2O)2]n

Mátyás Czugler, László Kótai, Bojja Sreedhar, Antal Rockenbauer, István Gács, Sándor Holly

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

Bis(pyridinium) tetrachlorocuprate monomer 1 and bis(pyridinium) octachlorodiaquatricuprate polymer 2 were synthesized and their crystal structures were determined. Both complexes contain pyridinium cations with bifurcated H-bridges. These H-bridges stabilize the monomeric structure of the tetrachlorocuprate anion together with the steric demand of the relatively large pyridinium ions in the crystal lattice of 1. Conversely, at the lower pyridinium ion: copper(II) ratio of 2, the bifurcated hydrogen bonds reduce the electron density on the chloride ions in such a way that the electron repulsion decreases and coordination spheres with more ligand interactions develop. Obviously, water may be a successful competitor for ligand sites in 2 as well. The octahedral and square-pyramidal structural units condense into polymeric chains which are stabilized by the interchain hydrogen bond networks of the water molecules, The structure motif of SP-5-[OC-6-SP-5-SP-5]-OC-6 (-CuCl5-[CuCl4(OH2)2- CuCl5-CuCl5]-CuCl4 (OH2)2-) were observed in 2, and the two neighboring square-pyramidal units were found to be localized in a transoid position. The IR and ESR spectroscopical characterization of complexes was also performed.

Original languageEnglish
Pages (from-to)3298-3304
Number of pages7
JournalEuropean Journal of Inorganic Chemistry
Issue number12
DOIs
Publication statusPublished - Dec 1 2002

Keywords

  • Copper
  • EPR spectroscopy
  • Hydrogen bonds
  • IR spectroscopy

ASJC Scopus subject areas

  • Inorganic Chemistry

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