The existing or potential applications of fused 1,2,5-thia- and -selenadiazoles in material science predetermined the quickly growing interest in these heterocyclic systems. This digest summarizes the recent progress in synthetic approaches, functionalization and employment of smart molecular materials based on these heterocycles. New starting materials as well as unknown and unexpected procedures, including direct chalcogen exchange in 1,2,5-chalcogenadiazole rings, are reviewed. The functionalization of fused 1,2,5-thia- and -selenadiazoles by cross-coupling reactions, nucleophilic substitution by the Buchwald-Hartwig strategy and co-polymerization are emphasized. Important applications, especially in the field of organic photovoltaics, are considered.

稠合的1,2,5-噻吩和-硒代二唑在材料科学中的现有或潜在应用预示了对这些杂环系统的快速增长的兴趣。本摘要总结了基于这些杂环的合成方法，功能化和使用智能分子材料的最新进展。审查了新的起始材料以及未知和意外的程序，包括在1,2,5-硫族二唑环中直接硫族元素交换。强调了通过交叉偶联反应，Buchwald-Hartwig策略的亲核取代和共聚作用来稠合1,2,5-噻吩和-硒代二唑的功能。考虑了重要的应用，特别是在有机光伏领域。