Crystal structure and triboluminescence .2. 9-anthracenecarboxylic acid and its esters
Crystal structure and triboluminescence .2. 9-anthracenecarboxylic acid and its esters
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DOI：
10.1021/cm960438r
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发表时间：
1997-05-01
影响因子：
8.6
通讯作者：
Kim, TJ
中科院分区：
文献类型：
--
作者：
Sweeting, LM;Rheingold, AL;Kim, TJ
摩擦发光活性通常被认为是晶体不对称性的结果；然而，大量关于中心对称摩擦发光材料的报道对这一假设提出了质疑。我们在这里通过合成 12 种 9-蒽甲酸酯并将它们的摩擦发光活性和酸的摩擦发光活性与晶体结构、纯度和光致发光相关联，在不偏见的情况下检查摩擦发光和晶体对称性之间的联系。在这个系列中，非中心对称晶体结构对于相对纯净的材料中的摩擦发光来说是必要的，但还不够；在所有中心对称和一种非中心对称材料中，杂质对于摩擦发光活性是必需的。结晶基序和其他结构因素与摩擦发光的相关性很弱。结果提供了支持摩擦发光激发的电荷分离和重组机制的证据。
Triboluminescence activity is usually assumed to be a consequence of crystal dissymmetry; however, the multitude of reports of centrosymmetric triboluminescent materials cast doubt on that assumption. We examine here the connection between triboluminescence and crystal symmetry without prejudice, by synthesizing 12 esters of 9-anthracenecarboxylic acid and correlating their triboluminescence activity and that of the acid with crystal structure, purity, and photoluminescence. In this series, a noncentrosymmetric crystal structure is necessary but not sufficient for triboluminescence in relatively pure materials; impurities are necessary for triboluminescence activity in all centrosymmetric and one noncentrosymmetric materials. Crystallization motif and other structure factors were only weakly correlated with triboluminescence. The results provide evidence in support of a charge separation and recombination mechanism for the excitation of the triboluminescence.