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Triarylamine‐Free Pyrenoimidazole‐Containing Organic Dyes with Different π‐Linkers for Dye‐Sensitized Solar Cells
Author(s) -
Kumar Dhirendra,
Thomas K. R. Justin,
Lee ChuanPei,
Ho KuoChuan
Publication year - 2015
Publication title -
asian journal of organic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.846
H-Index - 44
eISSN - 2193-5815
pISSN - 2193-5807
DOI - 10.1002/ajoc.201402214
Subject(s) - chemistry , solvatochromism , dye sensitized solar cell , photochemistry , solvation , thiophene , electrochemistry , time dependent density functional theory , acceptor , absorption (acoustics) , electron donor , electrolyte , organic chemistry , density functional theory , computational chemistry , molecule , electrode , physics , acoustics , condensed matter physics , catalysis
Abstract A series of arylamine‐free organic dyes that have a pyrenoimidazole donor, a cyanoacrylic acid acceptor, and different π‐linkers were synthesized and characterized by optical, electrochemical, and theoretical investigations. The nature of the π‐spacer exerts a significant effect on electronic properties of these dyes. The absorption maxima red‐shifts on progressive addition of thiophene units in the conjugation pathway. All the dyes displayed negative solvatochromism indicative of effective solvation of the dyes by polar solvents in the ground state. The oxidation potential of the dyes shifted negatively on introduction of electron rich spacer. TDDFT computations were also performed to explain the optical and electrochemical properties of the dyes. They were demonstrated as sensitizers in dye‐sensitized solar cells, the efficiency of which is promising.