Study of the Polymorphism in Copper(II) Decanoate through Its Phase Diagram with Decanoic Acid, and Texture of the Columnar Thermotropic Liquid Crystal Developable Domains in This and Similar Systems
| Autor: | M. I. Redondo Yélamos, J. A. Rodríguez Cheda, Sol López-Andrés, Francisco Javier Martinez-Casado, Alejandro Fernandez-Martinez, M. Ramos Riesco |
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| Rok vydání: | 2014 |
| Předmět: | |
| Zdroj: | Crystal Growth & Design. 15:497-509 |
| ISSN: | 1528-7505 1528-7483 |
| DOI: | 10.1021/cg501572s |
| Popis: | A new third polymorph of copper(II) decanoate has been found by two methods: from the crystallization of the salt–acid solution and from a specific thermal treatment of the polymorph obtained in n-heptane. The new polymorph, whose crystal structure has been solved for the first time, is the most stable from the thermodynamic point of view. It presents a bilayer structure, but with two different types of paddle-wheels catenae with opposite orientations. This polymorphism as well as the temperature vs composition phase diagram of the system, [(1 – x) C9H21CO2H + (x) (C9H21CO2)2Cu], were solved by differential scanning calorimetry, Fourier transform infrared spectroscopy, X-ray diffraction, pair distribution function, and optical microscopy. The singularities of the phase diagram are (a) a Krafft-like process of molecular association of the copper(II) decanoate into the acid solution, at about T = 361.5 K and x = 0.022 (forming salt-acid adducts of 1:1 stoichiometry); (b) a fusion transition as an invariant ... |
| Databáze: | OpenAIRE |
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