UV-vis and EPR spectroelectrochemical investigations of triarylamine functionalized arylene bisimides

Abstract

The ambipolar behavior of groups of N-substituted and core-functionalized triarylamine arylene bisimides were investigated by electrochemical and spectroelectrochemical (UV-vis and EPR spectroelectrochemistry) techniques.

The impact of replacement of nitrogen with phosphorus atom in the pyromellitic diimides on their photophysical and electrochemical properties

“…Based on registered spectra, it could be concluded that replacing a nitrogen atom with a phosphorus atom results in the bathochromic shift of bands associated with not only neutral but also with reduced form. Additionally, the absorption bands observed in the course of reduction can be assigned to generated radical anions, as similar changes in UV-Vis-NIR spectra during reduction of N,N'-diarylated PyDIs were observed in previous works [38][39][40]. Due to the low solubility of 1-O in organic solvents, it was difficult to obtain spectroelectrochemical spectra.…”

Triphenylamine disubstituted naphthalene diimide: elucidation of excited states involved in TADF and application in near-infrared organic light emitting diodes

“…This low energy band has been observed in a large range of core-substituted NDIs but is not present in nonsubstituted NDIs. Common substituents which induce this new absorption band include electron donating groups such as aliphatic and aromatic amines which can be attached to the core via amine nitrogen 13 or via a phenylene linker 40 as in TPA-cNDI, but also phenyl or pyridine substituents. 41,42 In non-polar solvents this absorption has vibronic structure and thus as a result of conjugation to the NDI core, absorption is through a transition from ground state to 1 LE.…”

EPR and UV–vis spectroelectrochemical studies of diketopyrrolopyrroles disubstituted with alkylated thiophenes

“…UV-vis spectroelectrochemical investigations were carried out in solution, in a cell being a modification of cells described in [12][13][14]. In all experiments 10 À4 M solution of a given DPP derivative was prepared in 0.1 M Bu 4 NPF 6 /dichloromethane electrolyte.…”