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A Series of Ti 6 Oxo Clusters Anchored with Arylamine Dyes: Effect of Dye Structures on Photocurrent Responses
Author(s) -
Cui LiNa,
Liu PeiYi,
Yang Lei,
Shu XianPing,
Zhu QinYu,
Dai Jie
Publication year - 2019
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.201900921
Subject(s) - photocurrent , steric effects , titanium oxide , ligand (biochemistry) , chemistry , molecule , electrode , titanium , covalent bond , dye sensitized solar cell , photochemistry , materials science , stereochemistry , organic chemistry , electrolyte , optoelectronics , biochemistry , receptor
Dye molecules pre‐anchored on titanium oxo clusters (dye‐TOCs) are attractive as model compounds of dye‐sensitized titanium oxide. To investigate the effects of the dye ligand structures of the dye‐TOCs on photocurrent conversion, a series of dye‐TOCs with the same Ti 6 core structure and different antenna ligands (L) was synthesized and characterized crystallographically. The TOCs have the same structural formula of [Ti 6 O 4 L 2 (O 3 PPh) 2 (O i Pr) 10 ]. Two types of dyes with para ‐ or meta ‐substituted structures were designed and used as the ligands. The results show that charge transfer from the donor group to the TiO core of the TOCs with the para ‐substituted ligands is stronger than those with the meta ‐substituted ligands. The steric effect of the ligands also greatly influences the photocurrent density. Larger branched structures of the dye ligands reduce the coverage density of the dye‐TOCs on TiO 2 electrodes and also weaken the effective covalent bonding of the dye‐TOCs on the electrode, and consequently, the photocurrent is decreased.