Charge-transfer complexes. Part XII. Viscosity dependence of the intensity of contact charge-transfer absorption bands

1973 ◽  
pp. 1350 ◽  
Author(s):  
Christopher J. Bolter ◽  
Charles A. G. Brooks ◽  
Keith M. C. Davis ◽  
Michael E. Delf
Keyword(s):  
Charge Transfer ◽  
Charge Transfer Complexes ◽  
Absorption Bands ◽  
Viscosity Dependence

Charge-transfer complexes of purines and pyrimidines

1968 ◽  
Vol 21 (2) ◽  
pp. 419 ◽  
Author(s):  
A Fulton ◽  
LE Lyons
Keyword(s):  
Charge Transfer ◽  
Field Method ◽  
Charge Transfer Complexes ◽  
Absorption Bands ◽  
Consistent Field ◽  
Highest Occupied Molecular Orbital ◽  
Self Consistent Field ◽  
Semi Empirical ◽  
Purines And Pyrimidines ◽  
Good Agreement

The spectra of 20 purines and pyrimidines with chloranil, bromanil, and p-benzoquinone in dimethyl sulphoxide were studied. Most of the systems exhibited absorption bands which were concluded to be charge transfer in nature. The ionization energies of the molecules, derived from the positions of the bands, correlated well with the highest occupied molecular orbital energies calculated using the simple H�ckel method and were also in good agreement with ionization energy values calculated by a semi-empirical self-consistent field method.

Far infrared spectra of charge-transfer complexes between iodine and substituted pyridines

1967 ◽  
Vol 297 (1451) ◽  
pp. 440-448 ◽  
Keyword(s):  
Charge Transfer ◽  
Infrared Spectra ◽  
Equilibrium Constants ◽  
Far Infrared ◽  
Charge Transfer Complexes ◽  
Absorption Bands ◽  
Substituted Pyridines ◽  
Stretching Vibration ◽  
Far Infrared Spectra ◽  
Electronic And Steric Effects

Far infrared spectra of charge-transfer complexes between iodine and substituted pyridines, dissolved in cyclohexane, have been measured in the region 20 to 200 cm -1 . Bands have been assigned to the modified iodine molecule stretching vibration near 180 cm -1 , and to the stretching of the intermolecular bond in the range 65 to 95 cm -1 . The shifts of the vibration frequencies, and force constants calculated using a simple valency force field, have been discussed in relation to the mass, electronic and steric effects of substituent groups. Equilibrium constants for the formation of the complex have been determined. From the intensities of the absorption bands, further evidence has been found for a vibronic interaction, leading to a delocalization of the transition moment in the vibrations of the complexes, and to an enhancement of the intensity of absorption.

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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