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Intermediate Rotator Phase in Lead(II) Alkanoates



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Martínez Casado, Francisco J. and García Pérez, María Victoria and Redondo Yélamos, María Isabel and Rodríguez Cheda, José Antonio and Sánchez Arenas, Ángel Antonio and López Andrés, Sol and García Barriocanal, Javier and Rivera, A. and León Yebra, Carlos and Santamaría, Jesús (2007) Intermediate Rotator Phase in Lead(II) Alkanoates. Journal of physical chemistry C, 111 (18). pp. 6826-6831. ISSN 1932-7447

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Official URL: https://pubs.acs.org/doi/10.1021/jp068823j


Lead(II) alkanoates, from hexanoate to dodecanoate, have been analyzed by means of XRD, optical microscopy, DSC, FTIR, and electric spectroscopy. Four different phases have been identified, corresponding to the three thermal transitions measured by DSC: two of them solid (crystal and “intermediate” phases), and another two fluid (neat phase and isotropic liquid). Powder crystal XRD data indicate that the samples present a bilayered structure. The analysis of the (00l) spacing dependence with temperature in the three ordered phases strongly points to the intermediate phase to be a rotator phase. Optical microscopy and FTIR versus temperature also confirm a structural change from the crystal to the intermediate phase and its solid-state nature. Electrical conductivity maps the thermal transitions of the samples and shows a high ionic conductivity in the intermediate phase, which does not depend much on the carbon chain length. The high conductivity values (3 orders of magnitude higher in comparison with that of the ordered crystal at room temperature) obtained for the intermediate phase gave a further support to the existence of a rotator mesophase in the lead(II) alkanoate series.

Item Type:Article
Uncontrolled Keywords:Alkanoates; Crystal, Phase in Lead (II)
Subjects:Sciences > Physics > Chemistry, Physical and theoretical
Sciences > Geology > Crystallography
ID Code:69796
Deposited On:26 Jan 2022 07:57
Last Modified:26 Jan 2022 08:22

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