Candreva Angela, Ricciardi Loredana, Szerb Elisabeta I, La Deda Massimo
Department of Chemistry and Chemical Technologies, University of Calabria, I-87036 Rende, Italy.
CNR-NANOTEC Institute of Nanotechnology, National Research Council, I-87036 Rende, Italy.
Nanomaterials (Basel). 2024 Sep 24;14(19):1543. doi: 10.3390/nano14191543.
This paper explores a novel synthesis and characterization of silica-coated gold nanorods (AuNRs) embedding a highly emissive cyclometalated iridium(III) complex, denoted as Ir. We investigate the optical properties and the interplay between the metal compound and gold plasmon, observing how the emission of Ir incorporated into the nanoparticles shows two emission bands, one in the blue and the other in the green-orange range of the visible spectrum. To obtain a clearer picture of what we were observing, we synthesized analogous nanosystems, from which it was possible to highlight the effect of different features. Based on what we observed, we proposed that the fraction of the iridium(III) complex in direct contact with the surface of the gold nanoparticle undergoes a "demixing" of the excited state, which, for cyclometalated iridium complexes, is generally considered a mixed LC+MLCT state. This preliminary study sheds light on the complexity of the "talking" between a fluorophore and a plasmonic system, highlighting the importance of considering the emitter typology when modeling such systems.
本文探索了一种新型的合成方法并对包硅金纳米棒（AuNRs）进行了表征，该纳米棒嵌入了一种高发射性的环金属化铱（III）配合物，记为Ir。我们研究了其光学性质以及金属化合物与金等离子体之间的相互作用，观察到掺入纳米颗粒中的Ir的发射呈现出两个发射带，一个在蓝光区域，另一个在可见光谱的绿橙区域。为了更清楚地了解我们所观察到的现象，我们合成了类似的纳米系统，从中可以突出不同特征的影响。基于我们的观察结果，我们提出与金纳米颗粒表面直接接触的铱（III）配合物部分经历了激发态的“分离”，对于环金属化铱配合物来说，这种激发态通常被认为是混合的LC + MLCT态。这项初步研究揭示了荧光团与等离子体系统之间“相互作用”的复杂性，突出了在对此类系统进行建模时考虑发射体类型的重要性。
