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Journal of Structural Chemistry

, Volume 50, Issue 1, pp 137–148 | Cite as

Structural types of octa(ɛ-caprolactam)-lanthanide(III) hexa(isothiocyanato)chromates(III). Phase transition with reversible twinning

  • A. V. Virovets
  • E. V. Peresypkina
  • E. V. Cherkasova
  • T. G. Cherkasova
  • N. V. Podberezskaya
Article

Abstract

The compounds [LnL8][Cr(NCS)6] (Ln = La3+, Pr3+, Eu3+, Gd3+, Tb3+, Yb3+, L =ɛ-C6H11NO) were obtained from aqueous solutions containing LnCl3, K3[Cr(NCS)6], and ɛ-caprolactam at 4–6. All these compounds have thermochromic properties and reversibly changed color from pale violet to dark green when heated in air at 473–483 K. The compounds crystallized as one of the three related structural types with the mutual packing of ions topologically corresponding to the packing in the structure of NaCl. The [EuL8][Cr(NCS)6] single crystal underwent a reversible phase transition at T = 240–250 K, which was accompanied by reversible twinning.

Keywords

lanthanum praseodymium europium gadolinium terbium ɛ-caprolactam crystal structure phase transition twinning thermochromism 

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Copyright information

© Pleiades Publishing, Ltd. 2009

Authors and Affiliations

  • A. V. Virovets
    • 1
  • E. V. Peresypkina
    • 1
  • E. V. Cherkasova
    • 2
  • T. G. Cherkasova
    • 2
  • N. V. Podberezskaya
    • 1
  1. 1.A. V. Nikolaev Institute of Inorganic Chemistry, Siberian DivisionRussian Academy of SciencesNovosibirskRussia
  2. 2.Kuzbass State Technical UniversityKemerovoRussia

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