Departamento de Física, Instituto de Ciências Exatas, Universidade Federal de Minas Gerais, Av. Antônio Carlos, 6627, Belo Horizonte, Minas Gerais, Brazil.
Université Paris-Saclay, CNRS, Laboratoire de Physique Des Solides, Bâtiment 510, Campus d'Orsay, 91 405, Orsay, France.
J Fluoresc. 2021 Nov;31(6):1855-1862. doi: 10.1007/s10895-021-02810-4. Epub 2021 Sep 14.
Investigation of temperature-dependent photoluminescent properties of potassium perylene-3,4,9,10-tetracarboxylate (KPTC), a molecule with no internal rotational degrees of freedom, shows aggregation-induced enhanced emission at room temperature. The different excitonic emission processes are dependent of temperature, some of which quenches in an intermediate temperature range (from 50 to 150 K). The exciton excited states switching phenomenon from "dark" to "bright" states is observed and its explained using Herzberg-Teller selection rule. KPTC is a molecule comparable to the size of its precursor, perylene-3,4,9,10-tetracarboxylic anhydride (PTCDA) and is highly soluble in water, contrary to PTCDA, which is poorly soluble in most solvents. Powder x-ray diffraction measurements corroborate a lesser degree of ordering of bulk KPTC compared to bulk PTCDA. The green luminescent molecule could, in principle, be used as a biomarker, or in photodynamic therapy, if further studies show relatively low toxicity.
对具有无内部旋转自由度的分子钾苝-3,4,9,10-四羧酸（KPTC）的温度依赖性光致发光性质的研究表明，在室温下会发生聚集诱导增强发射。不同的激子发射过程取决于温度，其中一些在中间温度范围内（50 至 150 K）猝灭。观察到从“暗”到“亮”状态的激子激发态跃迁现象，并使用 Herzberg-Teller 选择定则对其进行了解释。KPTC 的分子大小与前体苝-3,4,9,10-四羧酸酐（PTCDA）相当，并且在水中高度溶解，与在大多数溶剂中溶解度较差的 PTCDA 相反。粉末 X 射线衍射测量证实，与块状 PTCDA 相比，块状 KPTC 的有序度较低。如果进一步的研究表明相对较低的毒性，那么这种绿色发光分子原则上可以用作生物标志物或光动力疗法。
