The aggregation behaviour of Au(I) complexes in condensed phases can affect their emission properties. Herein, aggregation-induced room-temperature phosphorescence (RTP) is observed from the crystals of trinuclear Au(I) complexes. The RTP is highly sensitive to the crystal structure, with a slight difference in the alkyl side chains causing not only a change in the crystal structure but also a shift in the RTP maximum. Furthermore, in nanocrystals, reversible RTP colour changes are induced by phase transitions between crystal polymorphs during crystal growth from solution or the pulverisation of bulk crystals. The colour change mechanism is discussed in terms of intermolecular interactions in the crystal structure of the luminescent aggregates. The results suggest that the behaviour in nanocrystals may differ from that in bulk crystals. These insights will advance the fundamental understanding of crystallisation mechanisms and may aid in the discovery of new materials properties for solids with nano- to micrometre sizes.

Au(I) 配合物在凝聚相中的聚集行为会影响它们的发射特性。在此，从三核 Au(I) 配合物的晶体中观察到聚集诱导的室温磷光 (RTP)。RTP 对晶体结构高度敏感，烷基侧链的细微差异不仅会导致晶体结构发生变化，还会导致 RTP 最大值发生偏移。此外，在纳米晶体中，可逆的 RTP 颜色变化是由晶体多晶型物之间的相变在溶液晶体生长或大块晶体粉碎过程中引起的。根据发光聚集体晶体结构中的分子间相互作用讨论了颜色变化机制。结果表明，纳米晶体中的行为可能不同于块状晶体中的行为。