Kuroda Yuki, Tamaru Masakazu, Nakasato Hitoya, Nakamura Kyosuke, Nakata Manami, Hisano Kyohei, Fujisawa Kaori, Tsutsumi Osamu
Department of Applied Chemistry, Ritsumeikan University, 1-1-1 Nojihigashi, Kusatsu, 525-8577, Japan.
Commun Chem. 2020 Oct 14;3(1):139. doi: 10.1038/s42004-020-00382-1.
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.
金（I）配合物在凝聚相中的聚集行为会影响其发光性质。在此，从三核金（I）配合物的晶体中观察到聚集诱导室温磷光（RTP）。该RTP对晶体结构高度敏感，烷基侧链的微小差异不仅会导致晶体结构的变化，还会使RTP最大值发生偏移。此外，在纳米晶体中，在从溶液中晶体生长或块状晶体研磨过程中，晶体多晶型之间的相变会引发可逆的RTP颜色变化。根据发光聚集体晶体结构中的分子间相互作用对颜色变化机制进行了讨论。结果表明，纳米晶体中的行为可能与块状晶体不同。这些见解将推动对结晶机制的基本理解，并可能有助于发现具有纳米至微米尺寸固体的新材料特性。
