Electrolytic Preparation and EPR Study of Crystalline Pyrene, Perylene, and Azulene Perchlorates
Electrolytic Preparation and EPR Study of Crystalline Pyrene, Perylene, and Azulene Perchlorates
复制标题
结晶芘、苝和甘菊高氯酸盐的电解制备和 EPR 研究
DOI：
10.1063/1.1675135
复制
发表时间：
1971
期刊：
影响因子：
--
通讯作者：
Digby F. Williams
中科院分区：
文献类型：
--
作者：
T. Chiang;A. H. Reddoch;Digby F. Williams
报道了结晶芘、苝和过氯酸azulene的制备。详细介绍了这种新方法——在电解槽的阳极上生长。每一种化合物的晶体样品的EPR共振具有非常窄的线宽，约为0.1 g。芘和苝盐的共振各由两种组分组成。一种遵循居里定律，在低温下占优势。它被归因于“杂质”，可能是晶格缺陷。另一个组分，主要在高温下，由热生成的万尼尔三重态激子产生。芘和苝盐的激发能分别为0.18和0.27 eV。在可用的温度范围内，偶氮盐只产生“杂质”信号。
The preparation of crystalline pyrene, perylene, and azulene perchlorates is reported. Details of the novel method, growth on the anode in an electrolytic cell, are given. Crystalline samples of each compound give EPR resonances with very narrow linewidths, about 0.1 G. The resonances from the pyrene and perylene salts each consist of two components. One follows a Curie law and dominates at low temperature. It is attributed to “impurities,” probably lattice defects. The other component, dominating at high temperature, arises from thermally generated Wannier triplet excitons. The excitation energies are 0.18 and 0.27 eV for the pyrene and perylene salts, respectively. The azulene salt yielded only the “impurity” signal within the available temperature range.