Panchromic Cationic Iridium(III) Complexes

Abstract

We report the synthesis, X-ray structures, and optoelectronic characterization of two cationic iridium complexes bearing bis[(4-methoxyphenyl)imino]acenaphthene ligands. These complexes exhibited panchromic absorption extending as far as 800 nm, making them of interest for solar-energy-harvesting applications.

Cyclometalated Ruthenium(II) Complexes Featuring Tridentate Click‐Derived Ligands for Dye‐Sensitized Solar Cell Applications

“…In comparison to N749 , the MLCT maximum of RuNCN has a comparable extinction coefficient, but is hypsochromically shifted from 605 to 552 nm (corresponding to 0.2 eV) in DMF/methanol (4:1, v/v). To assess the light‐harvesting capabilities of the cyclometalated dyes relative to N749 , the product of ε ( λ ) (with λ >400 nm) and the AM 1.5 solar photon flux was integrated 25. Ideally, RuNCN would allow for 80 % of the theoretical current achievable with N749 , while RuNCN‐F would only allow about 60 % of N749 and 75 % of RuNCN due to its blue‐shifted absorption.…”

“…To assess the light-harvesting capabilities of the cyclometalated dyes relative to N749, the product of e(l) (with l > 400 nm) and the AM 1.5 solar photon flux was integrated. [25] Ideally, RuNCN would allow for 80 % of the theoretical current achievable with N749, while RuNCN-F would only allow about 60 % of N749 and 75 % of RuNCN due to its blue-shifted absorption. For RuNCN-NO 2 , the spectral blue shift is compensated by the increased molar absorptivity yielding an overall light-harvesting capability equal to the one of RuNCN.…”

Photophysics and photochemistry of 1,2,3-triazole-based complexes

“…[58] When bis[(4-methoxyphenyl)imino]acenaphthene is used as an ancillary ligand biscyclometalated phenyltriazole complexes exhibit panchromatic absorption extending as far as 800 nm. [59] Biscyclometalated aryltriazole iridium(III) complexes have recently been investigated for their use as photosensitisers in DSSC devices achieving some of the highest efficiencies for iridium(III) based dyes relative to benchmark complexes. [17] Triscyclometalated complexes containing aryltriazole ligands have also been prepared.…”

Easy Entry into Reduced Ar‐BIANH2 Compounds: A New Class of Quinone/Hydroquinone‐Type Redox‐Active Couples with an Easily Tunable Potential

“…Applications in catalysis of Ar‐BIAN complexes with main‐group elements also start to be reported 65. Moreover, Ar‐BIAN complexes have also been found to display interesting photophysical properties66–72 and pharmaceutical activities,73, 74 besides being the structural motif for new self‐assembled molecular architectures 75. 76…”