Robin Kampes, Avinash Chettri, Dr. Maria Sittig, Guangjun Yang, Dr. Stefan Zechel, Dr. Stephan Kupfer, Dr. Martin D. Hager, Prof. Dr. Benjamin Dietzek-Ivanšić, Prof. Dr. Ulrich S. Schubert
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Abstract
We present a luminescent Ir(III) complex featuring a bidentate halogen bond donor site capable of strong anion binding. The tailor-made Ir(III)(L)2 moiety offers a significantly higher emission quantum yield (8.4 %) compared to previous Ir(III)-based chemo-sensors (2.5 %). The successful binding of chloride, bromide and acetate is demonstrated using emission titrations. These experiments reveal association constants of up to 1.6×105 M−1. Furthermore, a new approach to evaluate the association constant by utilizing the shift of the emission was used for the first time. The experimentally observed characteristics are supported by quantum chemical simulations.
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