The photophysical features and waveguiding behavior of two series of thiadiazoles are reported. The different substitution patterns on the thiadiazole moiety (1,3,4- or 1,2,5-system) result in bent and linear molecular geometries in which the peripheral substitution plays a prominent role in their aggregation ability. Thus, only the presence of the 3,4,5-trimethoxyaryl moiety favors the aggregation of thiadiazoles 5 and 8 into crystalline supramolecular structures. The linear geometry and the aggregation of the methoxy-substituted benzo[c][1,2,5]thiadiazole 8 have been corroborated by X-diffraction analysis. The photoluminescence (PL) quantum yields of the aggregated heterocycles 5 and 8 decreases with respect to the PL quantum yield in solution due to an aggregation-caused quenching (ACQ) effect. Despite this ACQ, the crystalline aggregates of both bent and linear thiadiazoles 5 and 8 exhibit waveguiding behavior with different emission colors (red, green and blue).

报道了两个系列的噻二唑的光物理特征和波导行为。噻二唑部分（1,3,4-或1,2,5-系统）上的不同取代方式导致弯曲和线性的分子几何结构，其中外围取代在其聚集能力中起着重要作用。因此，仅3，4，5-三甲氧基芳基部分的存在有利于噻二唑5和8聚集成结晶的超分子结构。通过X-衍射分析证实了甲氧基取代的苯并[ c ] [1,2,5]噻二唑8的线性几何形状和聚集。聚集的杂环5和8的光致发光（PL）量子产率由于聚集引起的猝灭（ACQ）效应，溶液中PL量子产率降低。尽管具有此ACQ，但弯曲的和线性的噻二唑5和8的结晶聚集体均显示出具有不同发射颜色（红色，绿色和蓝色）的波导行为。