Triclinic modification of diaqua-bis-(5-carb-oxy-1H-imidazole-4-carboxyl- ato-k2N 3,O 4)iron(II)

Eriko Ohshima, Kazuki Yoshida, Kazumasa Sugiyama, Hidehiro Uekusa

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


The title compound, [Fe(C5H3N2O 4)2(H2O)2], is a triclinic modification of a monoclinic form recently reported by Du et al. [Acta Cryst. (2011), E67, m997]. The FeII ion lies at an inversion center and is coordinated by two N and two O atoms from two 5-carb-oxy-1H-imidazole-4-carboxyl-ate ligands in trans positions, together with two water mol-ecules, completing a slightly distorted octahedral coordination. Inter-molecular N-H⋯O hydrogen bonding between the N-H group of the imidazole ring and the deprotonated carboxyl-ate group builds a chain of 5-carb-oxy-1H-imidazole-4-carboxyl-ate anions along the [101] direction. The water molecules form intermolecular hydrogen bonds to O-C and O=C sites of the carboxylate group in adjacent layers.

Original languageEnglish
Pages (from-to)m1093-m1094
JournalActa Crystallographica Section E: Structure Reports Online
Issue number8
Publication statusPublished - 2012 Aug


  • R factor = 0.041
  • T = 298 K
  • data-to-parameter ratio = 13.7
  • mean σ(C-C) = 0.004 Å
  • single-crystal X-ray study
  • wR factor = 0.075

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics


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