Phosphorescent Iridium(III) Complexes with Acyclic Diaminocarbene Ligands as Chemosensors for Mercury

Eremina, Anzhelika A, Kinzhalov, Mikhail A, Katlenok, Evgene A, Smirnov, Andrey S, Andrusenko, Elena V, Pidko, Evgeny A, Suslonov, Vitalii V and Luzyanin, Konstantin V ORCID: 0000-0001-9312-7139 (2020) Phosphorescent Iridium(III) Complexes with Acyclic Diaminocarbene Ligands as Chemosensors for Mercury. INORGANIC CHEMISTRY, 59 (4). pp. 2209-2222.

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Abstract

A new application for bis(cyclometalated) iridium(III) species containing ancillary acyclic diaminocarbene ligands, viz. for sensing of mercury(II) ions, is disclosed. A family of bis(cyclometalated) iridium(III) species supported by both parent isocyanide and acyclic diaminocarbene ligands was prepared, and their electrochemical and photophysical properties were evaluated, revealing efficient blue-green phosphorescence in solution with quantum yields of up to 55%. We uncovered that the photophysical properties of these complexes are dramatically altered by the presence of metal ions and that the complex [Ir(ppy)₂(CN){C(NH₂)(NHC₆H₄-4-X)}] with an ADC ligand reacts selectively with Hg²⁺ ions, enabling its use for sensing of mercury(II) ions in solution. The limit of detection was as low as 2.63 × 10^-7 M, and additional mechanistic studies indicated the formation of an unusual dinuclear iridium(III) cyclometalated intermediate, bridged by a mercury dicyano fragment as a driving force of mercury sensing.

Item Type:	Article
Depositing User:	Symplectic Admin
Date Deposited:	12 Feb 2020 08:57
Last Modified:	25 Jan 2024 10:15
DOI:	10.1021/acs.inorgchem.9b02833
Related URLs:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3074556