NDLI: Visible light-harvesting cyclometalated Ir(III) complexes as triplet photosensitizers for triplet

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Ma, Lihua Li, Qiuting Zhao, Jianzhang Guo, Song Guo, Huimin
Description	Author Affiliation: Ma L ( State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, E-208 West Campus, 2 Ling-Gong Road, Dalian 116012, PR China.)
Abstract	Visible light-harvesting cyclometalated Ir(III) complexes with 3-(2-benzothiazoly)-7-diethylaminocoumarin as the C^N cyclometalation ligands were prepared. The ancillary N^N ligand is either 6-piperidine naphthalimide- phenanthroline (Ir-1) or 9-aminophenanthroline (Ir-3). $Ir(ppy)_{2}(Phen)$ was prepared as model complex (Ir-2). Ir-1 and Ir-3 show strong absorption of visible light (ε = 109000 $M^{−1}$ $cm^{−1}$ or 112000 $M^{−1}$ $cm^{−1}$ at 486 or 484 nm, respectively). All the complexes show room temperature phosphorescence with drastically different phosphorescence quantum yields $(Φ_{P}$ = 4.3%, 44.3% and 46.0% for Ir-1, Ir-2 and Ir-3, respectively). With steady state and time-resolved spectra , as well as DFT calculations, the $T_{1}$ excited states of Ir-1 and Ir-3 were proposed to be the $^{3}IL$ state, whereas the $^{3}MLCT$ state was proposed for Ir-2. Long-lived emissive triplet excited states (7.6 μs and 54.5 μs) were observed for Ir-1 and Ir-3, compared to the short $T_{1}$ excited state lifetime of Ir-2 (1.2 μs). The complexes were used as triplet photosensitizers for triplet–triplet annihilation upconversion and upconversion quantum yields $(Φ_{UC})$ of 19.3% and 12.7% were observed for Ir-1 and Ir-3, respectively. No upconversion was observed for Ir-2 under the same experimental conditions.
ISSN	14779226
Issue Number	35
Journal	Dalton Trans.
Volume Number	41
e-ISSN	13645447
Language	English
Publisher	Royal Society of Chemistry
Publisher Date	2012-09-21
Publisher Place	Great Britain (UK)
Access Restriction	Subscribed
Subject Keyword	Chemistry
Content Type	Text
Resource Type	Article
Subject	Inorganic Chemistry

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