A giant 2-dimensional dielectric response in a compressed hydrogen-bonded hybrid organic–inorganic salt†,Journal of Materials Chemistry C

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A giant 2-dimensional dielectric response in a compressed hydrogen-bonded hybrid organic–inorganic salt†
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2018-06-29 00:00:00 , DOI: 10.1039/c8tc02464b
Damian Paliwoda _{1,

2,

3,

4,

5} , Marek Szafrański _{2,

3,

4,

6} , Michael Hanfland _{5,

7,

8,

9} , Andrzej Katrusiak _{1,

2,

3,

4}

Affiliation

A strongly anisotropic 2-dimensional relaxor-like dielectric response has been obtained in the hybrid organic–inorganic crystal of pyrazinium tetrachloroaurate [C₄H₅N₂]⁺AuCl₄⁻, composed of pyrazinium aggregates separated by AuCl₄⁻ polyanionic sheets. This crystal is stoichiometric and it is the first known structure to exhibit 2D relaxor-like properties. This anisotropic response stems from the highly polarizable hydrogen bonds NH⁺⋯N linking the pyrazinium cations into chains extending in diagonal directions perpendicular to the tetragonal axis. Under normal conditions, the NH⁺⋯N bond is long, but high pressure reduces the N⋯N distance from 2.867 to 2.41 Å at 12.67 GPa. A pressure of only 1 GPa results in a huge increase of the electric permittivity by two orders of magnitude within the plane parallel to the NH⁺⋯N bonds. This is an emerging new class of layered stoichiometric materials with a large anisotropic dielectric constant highly sensitive to external stimuli.

中文翻译：

压缩氢键杂化有机-无机盐中的巨大二维电介质响应†

的强各向异性2维弛豫状介电响应已吡嗪四氯的杂化有机-无机晶体获得[C ₄ H ^ ₅ Ñ ₂ ] ⁺ AUCL ₄^-吡嗪聚集体由通过AUCL分离₄^-聚阴离子表。该晶体是化学计量的，并且是第一个已知的具有2D弛豫样性质的结构。这种各向异性的响应来自于高度可极化的氢键NH ⁺ ⋯N，该键将吡嗪鎓阳离子连接成在垂直于四角轴的对角线方向上延伸的链。在正常情况下，NH ⁺⋯N键很长，但是高压使N⋯N距离在2.67 GPa下从2.867减小到2.41Å。仅1 GPa的压力会导致在平行于NH ⁺ ⋯N键的平面内，介电常数大幅增加两个数量级。这是新兴的一类新型的分层化学计量材料，具有对外部刺激高度敏感的大的各向异性介电常数。

更新日期：2018-06-29

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