Pulse radiolysis of organic halogen compounds. II. Transient bromine-atom charge-transfer complexes observed by pulse radiolysis

1970 ◽  
Vol 92 (4) ◽  
pp. 1099-1101 ◽  
Author(s):  
Jean M. Bossy ◽  
Rolf E. Buehler ◽  
M. Ebert
Keyword(s):  
Charge Transfer ◽  
Pulse Radiolysis ◽  
Bromine Atom ◽  
Charge Transfer Complexes ◽  
Organic Halogen ◽  
Halogen Compounds

Charge-transfer complexes in the scavenging by iodine of radicals formed on pulse radiolysis of cyclo hexane

1965 ◽  
Vol 287 (1408) ◽  
pp. 1-14 ◽  
Keyword(s):  
Charge Transfer ◽  
Extinction Coefficient ◽  
Pulse Radiolysis ◽  
Transient Absorption ◽  
Charge Transfer Complex ◽  
Charge Transfer Complexes ◽  
Concentrated Solutions ◽  
Neutral Radical ◽  
Radical Intermediates ◽  
Transient Spectra

Pulse radiolysis of solutions of iodine in cyclo hexane resulted in the formation of a transient absorption with wavelength maximum at 3300 Å. This transient spectrum was assigned to the C 6 H 12 ... I' charge-transfer complex. The spectrum and extinction coefficients of the complex over the wavelength range 2500 to 6500 Å were obtained, the coefficient at 3300 Å being 2025 1. mole -1 cm -1 . Hydrogen iodide in cyclo hexane gave rise to the same transient absorption. Pulse radiolysis of cyclo hexane and cyclo hexyl iodide alone gave rise to different transient spectra attributed to the cyclo hexyl radical, absorbing in the ultraviolet, extinction coefficient 3401. mole -1 cm -1 at 2550 Å and the C 6 H 11 .. .I* charge-transfer complex, absorption maximum 3900 A, extinction coefficient ~ 10 3 to 10 4 1. mole -1 cm -1 , respectively. During the course of the investigations rate constants were obtained for the following reactions: C 6 H 11 + I 2 C 6 H 11 I + I', k II = 7 x 10 9 1. mole -1 s -1 , 2C 6 H 12 ...I' -> 2C 6 H 12 + I 2 , k II = 1.06 x 10 10 1. mole -1 s -1 , or 21' -> I 2 , a C 6 H 10 + C 6 H 12 2C 6 H 11 k 11a + k 11b =2.5 x 10 9 1. mole -1 s -1 bC 12 H 22 Dilute solutions of iodine (10 -4 M) in cyclo hexane yielded experimental evidence for neutral radical intermediates only. There were, however, indications that ionic radical intermediates occur in more concentrated solutions ( > 10 -3 M). :

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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