Succinate bridged dimeric Cu(II) system containing sandwiched non-coordinating succinate dianion: Crystal structure, spectroscopic and thermal studies of [(phen)2Cu(μ-L)Cu(phen)2]L • 12.5H2O (H2L = succinic acid; Phen = 1,10-phenanthroline)

M. Padmanabhan, S. Meena Kumary, Xiaoying Huang, Jing Li

Research output: Contribution to journalArticle

43 Citations (Scopus)

Abstract

A mixed ligand and dimeric CuII complex [(phen) 2Cu(μ-L)Cu(phen)2]L • 12.5H2O (H 2L = succinic acid) containing bridging succinate moiety and also non-coordinated succinate dianion was prepared from polymeric Cu(II) succinate by nucleophilic reaction with o-phenanthroline (phen) followed by depolymerization. The dimeric product was characterized by crystallographic, spectroscopic and thermoanalytical studies. The complex crystallizes in triclinic crystal system and is composed of succinate bridged [(phen) 2Cu(μ-L)Cu(phen)2]2+ complex cations, non-coordinated succinate anions and hydrogen bonded water molecules. Within the dimeric cationic unit, each of the Cu atoms is octahedrally coordinated by four N atoms of both phen ligands and both O atoms of a carboxylate moiety of the bridging succinate group in chelating form. Through intermolecular π-π stacking interactions, the complex cations form positively charged 2-D layers, between which the non-coordinating succinate anions and water molecules are sandwiched. Both the electronic and EPR studies indicate that the dimeric complex undergoes partial dissociation in solution state to exist in two structural forms. The kinetic and thermodynamic parameters involved in three stage thermal decompositions of the dimeric complex could also be evaluated using Coats-Redfern method.

Original languageEnglish
Pages (from-to)3537-3544
Number of pages8
JournalInorganica Chimica Acta
Volume358
Issue number13
DOIs
Publication statusPublished - Sep 1 2005

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Keywords

  • Bridging succinate
  • Copper(II) succinate
  • Crystal structure
  • Cu(II) dimer
  • EPR spectra
  • Phenanthroline adduct
  • Thermoanalytical studies

ASJC Scopus subject areas

  • Biochemistry
  • Inorganic Chemistry
  • Physical and Theoretical Chemistry
  • Materials Chemistry

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