Additional Comments on the Induced Optical Activity in the Charge-transfer Complexes of Optically Active Ketones with Tetracyanoethylene

1983 ◽  
Vol 87 (8) ◽  
pp. 684-693 ◽  
Author(s):  
Akio Tajiri ◽  
Narishi Gonohe ◽  
Masahiro Hatano
Keyword(s):  
Charge Transfer ◽  
Optical Activity ◽  
Optically Active ◽  
Charge Transfer Complexes ◽  
Induced Optical Activity

Some remarks on the interpretation of natural and magnetically induced optical activity data

1967 ◽  
Vol 297 (1448) ◽  
pp. 16-26 ◽  
Keyword(s):  
Optical Activity ◽  
Dipole Transition ◽  
Optically Active ◽  
Optical Rotatory Dispersion ◽  
Perturbation Approach ◽  
Activity Data ◽  
Rotational Strength ◽  
Optical Rotatory Dispersion Curve ◽  
Isotropic Media ◽  
Induced Optical Activity

1. Introduction—A classification for optically active chromophores One of the most useful concepts that emerges from the perturbation approach to the theory of natural optical activity is that of the ‘rotational strength’ of a transition (Condon 1937). This signed quantity conveniently and effectively measures how strongly a particular transition contributes to both the dispersive and absorp­tive aspects of the optical activity of a molecule (Moscowitz 1962); it is obtainable experimentally from either the pertinent partial optical rotatory dispersion curve or the partial circular dichroism curve (Djerassi 1960), and it is amenable to theo­retical calculation for homogeneous isotropic media as the following scalar product (Condon 1937; Moscowitz 1962; Djerassi 1960; Rosenfield 1928). R ba = I {( a | μ e | b ). ( b | μ m | a )}. Here ( a | μ e | b ) and ( b | μ m | a ) are the electric and magnetic dipole transition moments, respectively, connecting the ground state a and the excited state b , and I means imaginary part. Accessible as such to both theory and experiment, the rotational strength provides one of the most suitable foundations on which to build quanti­tative correlations between optical activity data and molecular structure.

Optically active diastereomeric charge-transfer complexes

1973 ◽  
Vol 95 (23) ◽  
pp. 7913-7914 ◽  
Author(s):  
Hans. Wynberg ◽  
Koop. Lammertsma
Keyword(s):  
Charge Transfer ◽  
Optically Active ◽  
Charge Transfer Complexes

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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