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- Title
Unprecedented Strong Panchromic Absorption from Proton-Switchable Iridium(III) Azoimidazolate Complexes.
- Authors
Henwood, Adam F.; Yue Hu; Sajjad, Muhammad T.; Thalluri, Gopala K. V. V.; Ghosh, Sanjay S.; Cordes, David B.; Slawin, Alexandra M. Z.; Samuel, Ifor D. W.; Robertson, Neil; Zysman-Colman, Eli
- Abstract
Two new heteroleptic iridium(III) complexes bearing an aryldiazoimidazole ligand are reported. These complexes differ structurally with respect to the protonation state of the imidazole ring, but can be independently ac cessed by varying the synthetic conditions. Their structures have been unequivocally confirmed by X-ray crystal struc ture analysis, with surprising differences in the structural parameters of the two complexes. The strongly absorbing nature of the free diazoimidazole ligand is enhanced in these iridium complexes, with the protonated cationic complex demonstrating extraordinarily strong panchromic absorption up to 700 nm. The absorption profile of the deprotonated neutral complex is blueshifted by about 100 nm and thus the interconversion between the two complexes as a function of the acidity/basicity of the environment can be readily monitored by absorption spectroscopy. Theoretical calculations revealed the origins of these markedly different absorption properties. Finally, the protonated analogue has been targeted as an acceptor material for organic photovol taic (OPV) applications, and preliminary results are reported.
- Subjects
IRIDIUM; HETEROLEPTIC compounds; VANADIUM; ABSORPTION; PROTON transfer reactions; PROTONATION constants; LIGANDS (Chemistry)
- Publication
Chemistry - A European Journal, 2015, Vol 21, Issue 52, p19128
- ISSN
0947-6539
- Publication type
Article
- DOI
10.1002/chem.201503546