Issue 40, 2024

Dinuclear tricarbonylrhenium(i) complexes: impact of regioisomerism on the photoluminescence properties

Abstract

Dinuclear Re(I) complexes have proportionally been much less studied than mononuclear analogues. In particular, very little information is available about their solid-state emission properties. In this work, two structural isomers of dinuclear complexes (Bi-Re-metaPhe and Bi-Re-paraPhe), which differ by the relative position of the coordination spheres on a central phenyl ring, were synthesized and compared with each other and with the parent mononuclear compound (Mono-Re-Phe), from a theoretical and experimental point of view. In solution, the electronic, electrochemical and spectroscopic properties of the dinuclear complexes were almost identical, and rather close to those of the monomer. In the solid state, the photoluminescence (PL) efficiency of dimers was not higher than that of the monomer, but a clear mechanoresponsive luminescence (MRL) effect appeared only for the former ones. The positional isomerism influenced the amplitude of this effect, as well as the aggregation-induced emission (AIE) properties in a water-acetonitrile mixture. This study reveals the importance of positional isomerism to modulate the emission properties in the solid state. It also shows the advantage of dinuclear structures to access new MRL-active materials.

Graphical abstract: Dinuclear tricarbonylrhenium(i) complexes: impact of regioisomerism on the photoluminescence properties

Supplementary files

Article information

Article type
Paper
Submitted
02 Jūl. 2024
Accepted
23 Aug. 2024
First published
26 Aug. 2024
This article is Open Access
Creative Commons BY-NC license

Dalton Trans., 2024,53, 16512-16529

Dinuclear tricarbonylrhenium(I) complexes: impact of regioisomerism on the photoluminescence properties

S. Le Garrec, D. Martins-Bessa, M. Wolff, B. Delavaux-Nicot, S. Mallet-Ladeira, C. Serpentini, E. Benoist, F. Bedos-Belval and S. Fery-Forgues, Dalton Trans., 2024, 53, 16512 DOI: 10.1039/D4DT01907E

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