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• W2907897367 abstract "Quasi-spherical molecules have recently been developed as promising building blocks for constructing high-performance molecular ferroelectrics. However, although the modification of spherical molecules into quasi-spherical ones can efficiently lower the crystal symmetry, it is still a challenge to precisely arouse a low-symmetric polar crystal structure. Here, by introducing directional hydrogen-bonding interactions in the molecular modification, we successfully reduced the cubic centrosymmetric Pm3̅m space group of [quinuclidinium]ClO4 at room temperature to the orthorhombic polar Pna21 space group of [3-oxoquinuclidinium]ClO4. Different from the substituent groups of −OH, −CH3, and ═CH2, the addition of a ═O group with H-acceptor to [quinuclidinium]+ forms directionally N–H···O═C hydrogen-bonded chains, which plays a critical role in the generation of polar structure in [3-oxoquinuclidinium]ClO4. Systematic characterization indicates that [3-oxoquinuclidinium]ClO4 is an excellent molecular ferroelectric with a high Curie temperature of 457 K, a large saturate polarization of 6.7 μC/cm2, and a multiaxial feature of 6 equiv ferroelectric axes. This work demonstrates that the strategy of combining quasi-spherical molecule building blocks with directional intermolecular interactions provides an efficient route to precisely design new eminent molecular ferroelectrics." @default.
• W2907897367 created "2019-01-11" @default.
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• W2907897367 date "2019-01-07" @default.
• W2907897367 modified "2023-09-30" @default.
• W2907897367 title "Directional Intermolecular Interactions for Precise Molecular Design of a High-<i>T</i>_c Multiaxial Molecular Ferroelectric" @default.
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• W2907897367 doi "https://doi.org/10.1021/jacs.8b13223" @default.
• W2907897367 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/30615437" @default.
• W2907897367 hasPublicationYear "2019" @default.
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