New Advances in the One-Dimensional Coordination Polymer Copper(II) Alkanoates Series: Monotropic Polymorphism and Mesomorphism

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The polymorphism in the copper(II) alkanoates, recently discovered for one member, has been thoroughly studied for the whole series, from 3 to 16 C atoms. Three polymorphic phases have been found, all of them sharing the
same molecular unit, the paddle-wheel, which grows forming a 1D coordination polymer or catena. The three polymorphs are defined by a different packing of these catenae and a specific arrangement of the alkyl chains. Ten new crystal structures of those compounds have been solved by high resolution powder diffraction and presented in this paper. The polymorphism in
this series has been found to be monotropic and is responsible for the complex thermal behavior observed. The most characteristic feature, the endothermic−exothermic effect, has been explained for the first time in these compounds by a combination of data from differential scanning calorimetry (in normal and modulated modes), powder X-ray diffraction and
Fourier transform infrared spectroscopy. These techniques, together with small-angle X-ray scattering and optical microscopy, were used to analyze the hexagonal columnar discotic liquid crystal phase of copper(II) alkanoates. Thus, new information has been found in the packing and stacking of the discs formed by the paddle-wheel units, also maintained in the mesophase.


  • Miguel Ramos Riesco
  • Francisco Martinez
  • Jose A. Rodriguez Cheda
  • M. Isabel Redondo Yelamos
  • Ivan da Silva
  • Tomás Plivelic
  • Sol Lopez-Andres
  • Paolo Ferloni
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Natural Sciences
  • Physical Sciences


  • polymorphism, monotropism, columnar discotic liquid crystals, developable domains, paddle-wheels, copper(II) alkanoates, MOFs, 1D coordination polymers, PXRD and SCXRD, modulated-DSC, TGA, FTIR, polarizing light microscopy, SEM, Pyrolysis.
Original languageEnglish
Pages (from-to)2005-2016
JournalCrystal Growth & Design
Issue number4
Publication statusPublished - 2015
Publication categoryResearch