Syntheses and crystal structures of mixed-ligand copper(II)–imidazole–carboxylate complexes

Syeda Shahzadi Batool (Corresponding Author), William T A Harrison (Corresponding Author), Quratulain Syed, Muhammad Salman Haider

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The syntheses, characterization, and crystal structures of the reaction products of Cu2+ with imidazole (Himz) and different aromatic carboxylates, viz.: [Cu(Himz)2(cinn)2(H2O)] (1), [Cu(Himz)2(paba)2] (2) and [Cu(Himz)2(clba)2] (3) (cinn– = C9H7O2–, paba– = C7H6NO2–, clba– = C7H4ClO2–) are described and studied by spectroscopic (UV–visible, FTIR) measurements. Single-crystal X-ray diffraction analyses indicate that each complex is monomeric. The metal ion in 1 adopts square-pyramidal coordination geometry arising from two imidazole nitrogens, two cinnamate oxygens, and an apical aqua. The metal ions of 2 and 3, however, assume a square planar configuration, which is realized by coordination of two nitrogens of two imidazoles and two oxygens; in both complexes, the imidazole moieties are trans to each other. TGA results indicate that upon heating, these complexes lose their carboxylate anions first, followed by removal of the imidazole molecules.
Original languageEnglish
Pages (from-to)1380-1391
Number of pages12
JournalJournal of Coordination Chemistry
Issue number9
Early online date25 Apr 2018
Publication statusPublished - 2018


  • copper(II) carboxylate
  • 2-Chlorobenzoic acid
  • cinnamic acid
  • imidazole
  • p-aminobenzoic acid


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