Exploring the dark: detecting long-lived Nile Red 3ILCT states in Ru(II) polypyridyl photosensitisers

Claire Condon; Robert Conway-Kenny; Xiaoneng Cui; Lukas J. Hallen; Brendan Twamley; Jianzhang Zhao; Graeme W. Watson; Sylvia M. Draper

doi:10.1039/D1TC02830H

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Exploring the dark: detecting long-lived Nile Red ³ILCT states in Ru(ii) polypyridyl photosensitisers†

Claire Condon,

^a Robert Conway-Kenny,

*^a Xiaoneng Cui,^a Lukas J. Hallen,

^a Brendan Twamley,^a Jianzhang Zhao,

^b Graeme W. Watson

^a and Sylvia M. Draper

*^a

Author affiliations

* Corresponding authors

^a School of Chemistry, Trinity College Dublin, College Green, Dublin 2, Ireland
E-mail: conwaykr@tcd.ie, smdraper@tcd.ie

^b State Key Laboratory of Fine Chemicals, Dalian University of Technology, E208 Western Campus, 2 Ling Gong Road, Dalian 116012, P. R. China

Abstract

Two novel Ru(II) photosensitisers sporting ethynyl-Nile Red chromophores are shown to absorb strongly in the visible region, and to have two distinct but weakly emissive states (¹ILCT* and ³MLCT*). In addition a long-lived, lower energy ‘dark’ (non-emissive) triplet excited state is identified (³ILCT*) and successfully exploited for singlet oxygen generation.

This article is part of the themed collection: Journal of Materials Chemistry C HOT Papers

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Article information

DOI: https://doi.org/10.1039/D1TC02830H
Article type: Communication
Submitted: 17 Jun 2021
Accepted: 07 Sep 2021
First published: 08 Sep 2021

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J. Mater. Chem. C, 2021,9, 14573-14577

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Exploring the dark: detecting long-lived Nile Red ³ILCT states in Ru(II) polypyridyl photosensitisers

C. Condon, R. Conway-Kenny, X. Cui, L. J. Hallen, B. Twamley, J. Zhao, G. W. Watson and S. M. Draper, J. Mater. Chem. C, 2021, 9, 14573 DOI: 10.1039/D1TC02830H

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Journal of Materials Chemistry C