Investigation of the Structures of the Crystalline and Columnar Phases of Linear Chain Copper(II) Alkanoates |
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Authors: | H Abied D Guillon A Skoulios P Weber A M Giroud-godquin J C Marchon |
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Institution: |
a Institut Charles Sadron (CRM-EAHP), Strasbourg Cedex, France
b Department de Recherche Fondamentale, UA 1194 CNRS, Centre d'Etudes Nucleaires de Grenoble, Laboratoires de Chimie/Chimie de Coordination, Grenoble Cedex, France |
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Abstract: | Binuclear copper(11) complexes of fatty acids crystallize at room temperature in a lamellar lattice that has been characterized by X-ray diffraction. A transition to a thermotropic columnar mesophase is observed at about 110-120°C for each compound of the series n = 12 to n = 22, n being even and equal to the number of carbon atoms in the corresponding fatty acid. This columnar mesophase has been investigated by polarizing optical microscopy, differential scanning calorimetry and X-ray diffraction. Columns of polar copper carboxylate groups are surrounded by disordered aliphatic chains, and form a two-dimensional hexagonal lattice. The repeating unit in a column is a binuclear dicopper tetracarboxylate complex. |
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