Directional Intermolecular Interactions for Precise Molecular Design of a High-Tc Multiaxial Molecular Ferroelectric
| Autor: | Jing Wang, Yin Rao, Yan-Ting Ding, Chen-Kai Yang, Yongfa Xie, Ren-Gen Xiong, Wei-Qiang Liao, Wennan Zou, Wang-Nan Chen |
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| Rok vydání: | 2019 |
| Předmět: |
Group (mathematics)
Intermolecular force Substituent General Chemistry Crystal structure 010402 general chemistry 01 natural sciences Biochemistry Ferroelectricity Catalysis 0104 chemical sciences Crystallography chemistry.chemical_compound Colloid and Surface Chemistry chemistry Molecule Polar Orthorhombic crystal system |
| Zdroj: | Journal of the American Chemical Society. 141:1781-1787 |
| ISSN: | 1520-5126 0002-7863 |
| Popis: | 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 Pm3m 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... |
| Databáze: | OpenAIRE |
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