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Issue 102, 2015
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New properties in old systems: cooperative electric order in ferrocene and ammonia-borane

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Abstract

After half a century of intensive and extensive studies on ferrocene [Fe(C5H5)2] and ammonia-borane (H3N·BH3), it is very exciting to observe that these “classical” compounds still hide interesting properties never described before. Despite it being well-known that they both experience phase transitions as a function of temperature, here, for the first time, we give experimental evidence for the dielectric transitions they experience associated to the former, results that we support with DFT calculations. In that context, we report that ferrocene displays a temperature-induced paraelectric to antiferroelectric transition associated with the monoclinic–triclinic transition, which implies order–disorder of the cyclopentadienyl (Cp) ligands and displacement of the Fe atoms within the ferrocene molecules. As for the ammonia-borane, we report a sharp dielectric transition at T ≈ 232 K, associated with a structural transition that combines ordering and atomic displacement of the H3N·BH3 molecules. In this case, we attribute such behaviour to the temperature dependent displacement of the H3N·BH3 molecules out-of the crystal polar c-axis.

Graphical abstract: New properties in old systems: cooperative electric order in ferrocene and ammonia-borane

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Publication details

The article was received on 28 Jun 2015, accepted on 28 Sep 2015 and first published on 28 Sep 2015


Article type: Paper
DOI: 10.1039/C5RA12506E
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RSC Adv., 2015,5, 83818-83824
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    New properties in old systems: cooperative electric order in ferrocene and ammonia-borane

    J. M. Bermúdez-García, S. Yáñez-Vilar, S. Castro-García, M. A. Señarís-Rodríguez and M. Sánchez-Andújar, RSC Adv., 2015, 5, 83818
    DOI: 10.1039/C5RA12506E

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