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• W2034013231 endingPage "13391" @default.
• W2034013231 startingPage "13382" @default.
• W2034013231 abstract "Ferroelectricity as well as characteristic proton-transfer dynamics are achieved by combining a 2,3,5,6-tetra(2′-pyridyl)pyrazine (TPPZ) molecule with anilic acids (H2xa). Dielectric measurements revealed phase transitions at Tc = 334 and 172 K for bromanilate (Hba−) and chloranilate (Hca−) salts, respectively. The room-temperature ferroelectricity of the (H2-TPPZ)(Hba)2 crystal is evidenced by the slow polarization reversal with modest pyroelectricity. In accord with the observed large deuteration effect, synchrotron X-ray diffraction studies disclosed proton dynamics in an intramolecular N···H+···N bond of the H2-TPPZ2+ dication and in an O−H···O− hydrogen-bonded cyclic dimer of the ortho-quinoid Hxa− anions. The disordered (Hxa−)2 dimer in two-fold orientation manifests its double-proton transfer process above Tc, whereas these protons are ordered in the ferroelectric phase. The H2-TPPZ2+ dication acts as a proton sponge by forming two intramolecular N···H+···N hydrogen bridges between the pyridyl units with a very short N···N distance. The dication in the paraelectric state adopts a nonpolar geometry due to the delocalization of the protons over two sites in the respective N···H+···N bonds. Below Tc, only one of the two protons gets localized, and the resultant acentric H2-TPPZ2+ ion generates the dipole moment responsible for the ferroelectricity." @default.
• W2034013231 created "2016-06-24" @default.
• W2034013231 creator A5032371791 @default.
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• W2034013231 date "2008-09-10" @default.
• W2034013231 modified "2023-10-14" @default.
• W2034013231 title "Proton Dynamics and Room-Temperature Ferroelectricity in Anilate Salts with a Proton Sponge" @default.
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• W2034013231 doi "https://doi.org/10.1021/ja8032235" @default.
• W2034013231 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/18781747" @default.
• W2034013231 hasPublicationYear "2008" @default.
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