Blue emissive cobalt(III) complexes and their use in the photocatalytic trifluoromethylation of polycyclic aromatic hydrocarbons
Abstract
The first examples of room temperature (r.t.) luminescent Co(III) complexes ( 1 and 2 ) are presented that exhibit intense ligand‐to‐metal and ligand‐to‐ligand charge transfer absorption in the low energy UV region (λabs ~ 360‐400 nm) and low‐negative quasi‐reversible reduction events (E1/2(red) = −0.58 V and −0.39 V vs. SCE for 1 and 2 , respectively). The blue emission of 1 and 2 at r.t. is due to the large bite angles and strong σ‐donation of the ligands, the combined effect of which helps to separate the emissive 3LMCT (triplet ligand‐to‐metal charge transfer) and the non‐emissive 3MC (triplet metal‐centered) states. 1 and 2 were found to be powerful photo‐oxidants (ECo(III)*/Co(II) = 2.26 V and 2.75 V vs. SCE of 1 and 2 , respectively) and were used as inexpensive photoredox catalysts for the regioselective mono(trifluoromethylation) of polycyclic aromatic hydrocarbons (PAHs) in good yields (~ 40‐58%).
Citation
Pal , A K , Li , C , Hanan , G S & Zysman-Colman , E 2018 , ' Blue emissive cobalt(III) complexes and their use in the photocatalytic trifluoromethylation of polycyclic aromatic hydrocarbons ' , Angewandte Chemie International Edition , vol. 57 , no. 27 , pp. 8027-8031 . https://doi.org/10.1002/anie.201802532
Publication
Angewandte Chemie International Edition
Status
Peer reviewed
ISSN
1433-7851Type
Journal article
Description
A.K.P and G.S.H thank Natural Sciences and Engineering Research Council of Canada. A.K.P thanks the Leverhulme Trust Early Career Fellowship (ECF-2017-326) and the University of St Andrews. The authors thank the Prof. & Mrs Purdie Bequests Scholarship and AstraZeneca support for C.L. EZ-C thanks the Engineering and Physical Sciences Research Council (EP/M02105X/1) and the University of St Andrews.Collections
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