Department of Chemistry and Physics, La Trobe Institute for Molecular Science , La Trobe University , Melbourne , Victoria 3086 , Australia.
ACS Appl Mater Interfaces. 2018 Oct 31;10(43):37251-37257. doi: 10.1021/acsami.8b12995. Epub 2018 Oct 16.
A new class of redox metallopolymer based on cyclometalated iridium(III) centers is described, with unusually intense luminescence properties in aqueous media. We report the facile synthesis, photophysical and electrochemical characterization, supported by DFT calculations and their electrochemiluminescence (ECL) properties which, under some circumstances, are significantly greater than the analogous ruthenium-based materials. The photoluminescence (PL) and ECL of these materials are further dramatically enhanced when dispersed or immobilized as polymeric nanoparticles (PNPs). This aggregation-induced emission (AIE and AIECL) operates by providing important protection for the cyclometalated iridium(III) centers against the types of quenching processes which commonly afflict iridium-based luminophores in aqueous media. The results suggest interesting new avenues of research for the application of such materials in and PL and ECL-based detection and imaging as well as light-emitting devices.
一种基于重氮金属铱(III)中心的新型氧化还原金属聚合物被描述，具有在水介质中异常强的发光性质。我们报告了它们的简便合成、光物理和电化学特性，这些特性得到了 DFT 计算的支持，并且它们的电致化学发光（ECL）特性在某些情况下明显大于类似的基于钌的材料。当这些材料分散或固定为聚合物纳米粒子（PNP）时，其光致发光（PL）和 ECL 进一步显著增强。这种聚集诱导发射（AIE 和 AIECL）通过为环金属化铱（III）中心提供重要的保护，防止通常在水介质中影响基于铱的发光体的猝灭过程，从而发挥作用。这些结果为在基于 PL 和 ECL 的检测和成像以及发光器件中应用此类材料提供了有趣的新研究途径。
