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Carbonyl Coupling: Defects and O 2 Make or Break the Essential Reaction Intermediate on Titanium Dioxide
Author(s) -
Jensen Stephen C.,
Haubrich Jan,
Shank Alex,
Friend Cynthia M.
Publication year - 2011
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201101094
Subject(s) - scanning tunneling microscope , coupling (piping) , titanium dioxide , titanium , chemical physics , materials science , photochemistry , coupling reaction , chemistry , crystallography , chemical engineering , nanotechnology , catalysis , metallurgy , organic chemistry , engineering
Blocking interstitials : The strong effect of ambient O 2 on the surface chemistry of TiO 2 (110) is demonstrated for the first time by using molecular imaging. Scanning tunneling microscopy experiments show that O 2 reverses and inhibits the formation of a diolate coupling intermediate, whereas H 2 O does not (see figure). The strong affinity of O 2 for titanium interstitials, which are necessary for coupling, accounts for these effects.