Photooxidation of m-Phenoxytoluene at Colloidal Titanium Dioxide/Non-Aqueous Solution Interfaces

1989 ◽  
Vol 42 (8) ◽  
pp. 1351 ◽  
Author(s):  
E Blatt ◽  
DN Furlong ◽  
AWH Mau ◽  
WHF Sasse ◽  
D Wells
Keyword(s):  
Aqueous Solution ◽  
Titanium Dioxide ◽  
Charge Transfer ◽  
Intermediate Product ◽  
Charge Transfer Complexes ◽  
Analysis Technique ◽  
Aqueous Solvent

The selective photooxidation of m- phenoxytoluene to m-phenoxybenzaldehyde has been investigated in the system m-phenoxytoluene/O2/titanium dioxide/non-aqueous solvent/light. In acetonitrile the conversion was found to be c. 20% with starting concentrations of m-phenoxytoluene in the range 0.05-0.5 mol dm-3. Adsorption of m-phenoxytoluene, m-phenoxybenzaldehyde or the intermediate product m-phenoxybenzyl alcohol from acetonitrile on titanium dioxide was not detectable by an equilibration/centrifugation/supernatant analysis technique. Photoemission and photoexcitation measurements, however, showed that m- phenoxytoluene and m-phenoxybenzyl alcohol, but not m-phenoxybenzaldehyde , formed charge-transfer complexes with titanium dioxide surfaces. The selectivity of the photooxidation is explained in terms of pathways involving these charge-transfer complexes.

1:1 and 2:1 Charge-Transfer Complexes between Aromatic Hydrocarbons and Dry Titanium Dioxide

2005 ◽  
Vol 117 (6) ◽  
pp. 932-935 ◽  
Author(s):  
You Seok Seo ◽  
Changhoon Lee ◽  
Kee Hag Lee ◽  
Kyung Byung Yoon
Keyword(s):  
Titanium Dioxide ◽  
Charge Transfer ◽  
Aromatic Hydrocarbons ◽  
Charge Transfer Complexes

1:1 and 2:1 Charge-Transfer Complexes between Aromatic Hydrocarbons and Dry Titanium Dioxide

2005 ◽  
Vol 44 (6) ◽  
pp. 910-913 ◽  
Author(s):  
You Seok Seo ◽  
Changhoon Lee ◽  
Kee Hag Lee ◽  
Kyung Byung Yoon
Keyword(s):  
Titanium Dioxide ◽  
Charge Transfer ◽  
Aromatic Hydrocarbons ◽  
Charge Transfer Complexes

The Redox Behavior of 9,10-Anthraquinone-2-sulfonate in Acidic Aqueous Solution

1975 ◽  
Vol 53 (24) ◽  
pp. 3757-3760 ◽  
Author(s):  
Arthur D. Broadbent ◽  
Ronald J. Melanson
Keyword(s):  
Aqueous Solution ◽  
Charge Transfer ◽  
Acidic Solution ◽  
Charge Transfer Complex ◽  
Charge Transfer Complexes ◽  
Semiquinone Radical ◽  
Redox Behavior ◽  
Acidic Aqueous Solution ◽  
Titration Curves ◽  
Potentiometric Measurements

A green intermediate, observed during reduction of 9,10-anthraquinone-2-sulfonate (A) to the corresponding anthrahydroquinone (AH2) in acidic aqueous solution, has been identified as a quinhydrone-like charge-transfer complex of A and AH2. Spectrophotometric and potentiometric measurements have shown that changes in the slope of the potentiometric titration curves with varying initial [A] are caused only by this complex [Formula: see text]and not by any semiquinone radical (AH·) or radical anion (A·−) intermediate. The very low semiquinone formation constant in acidic solution indicates that the pKa of AH· < 7.0. Electrochemically determined pKa values for similar radicals in the range 8.5–10.5 are invalid because of interference by charge-transfer complexes of this type.

Magnetic properties of new charge-transfer complexes based on manganese porphyrins

1997 ◽  
Vol 90 (3) ◽  
pp. 407-413
Author(s):  
MARC KELEMEN ◽  
CHRISTOPH WACHTER ◽  
HUBERT WINTER ◽  
ELMAR DORMANN ◽  
RUDOLF GOMPPER ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Charge Transfer ◽  
Charge Transfer Complexes ◽  
Manganese Porphyrins

Charge Transfer Complexation Boosts Molecular Conductance Through Fermi Level Pinning

2018 ◽  
Author(s):  
Kun Wang ◽  
Andrea Vezzoli ◽  
Iain Grace ◽  
Maeve McLaughlin ◽  
Richard Nichols ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Single Molecule ◽  
Quantum Interference ◽  
Transmission Function ◽  
Scanning Tunneling ◽  
Charge Transfer Complexes ◽  
Tunneling Microscopy ◽  
Quantum Interference Effect ◽  
Single Molecule Junctions ◽  
Charge Transfer Complexation

We have used scanning tunneling microscopy to create and study single molecule junctions with thioether-terminated oligothiophene molecules. We find that the conductance of these junctions increases upon formation of charge transfer complexes of the molecules with tetracyanoethene, and that the extent of the conductance increase is greater the longer is the oligothiophene, i.e. the lower is the conductance of the uncomplexed molecule in the junction. We use non-equilibrium Green's function transport calculations to explore the reasons for this theoretically, and find that new resonances appear in the transmission function, pinned close to the Fermi energy of the contacts, as a consequence of the charge transfer interaction. This is an example of a room temperature quantum interference effect, which in this case boosts junction conductance in contrast to earlier observations of QI that result in diminished conductance.<br>

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