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Alcohol‐Based Sensitizer–Semiconductor Linkages Towards Improved Interfacial Electron Transfer Kinetics
Author(s) -
Beauvilliers Evan E.,
Malewschik Talita,
Meyer Gerald J.
Publication year - 2017
Publication title -
chemphotochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.13
H-Index - 18
ISSN - 2367-0932
DOI - 10.1002/cptc.201700040
Subject(s) - ruthenium , electron transfer , kinetics , oxidizing agent , reactivity (psychology) , nanosecond , chemistry , ligand (biochemistry) , photochemistry , alcohol , bipyridine , viologen , crystallography , catalysis , organic chemistry , crystal structure , receptor , medicine , laser , biochemistry , physics , alternative medicine , pathology , quantum mechanics , optics
A series of four ruthenium complexes with alcohol binding groups of the general form [Ru(dtb) 2 (LL)](PF 6 ) 2 (where dtb is 4,4′‐( tert ‐butyl) 2 ‐2,2′‐bipyridine and LL is an alcohol‐containing ligand) were anchored to mesoporous TiO 2 thin films. The complexes were found to sensitize light‐driven electron‐transfer reactivity of TiO 2 to the visible region and the complexes were hence termed sensitizers. The kinetics and yields of interfacial electron transfer were quantified on the nanosecond and longer timescales. The stability under oxidizing and light excitation conditions was assessed by spectroscopic methods. Comparative analysis with the more commonly utilized dicarboxylic acid containing ligand revealed that the sensitizer bearing two terminal CH 2 OH groups was found to have more efficient electron injection and slower back electron transfer.