Femtosecond-picosecond laser photolysis studies on the dynamics of excited charge-transfer complexes in solution. 2. Ion pair formation processes in the excited states of 1,2,4,5-tetracyanobenzene-aromatic hydrocarbon complexes in polar solvents

1990 ◽  
Vol 94 (15) ◽  
pp. 5834-5839 ◽  
Author(s):  
Seishi. Ojima ◽  
Hiroshi. Miyasaka ◽  
Noboru. Mataga
Keyword(s):  
Charge Transfer ◽  
Aromatic Hydrocarbon ◽  
Excited States ◽  
Picosecond Laser ◽  
Ion Pair ◽  
Pair Formation ◽  
Charge Transfer Complexes ◽  
Formation Processes ◽  
Polar Solvents ◽  
Picosecond Laser Photolysis

Picosecond laser photolysis studies of intramolecular charge transfer and heteroexcimer formation processes

1978 ◽  
Vol 53 (1) ◽  
pp. 67-70 ◽  
Author(s):  
Masahito Migita ◽  
Masafumi Kawai ◽  
Noboru Mataga ◽  
Yoshiteru Sakata ◽  
Soichi Misumi
Keyword(s):  
Charge Transfer ◽  
Intramolecular Charge Transfer ◽  
Picosecond Laser ◽  
Laser Photolysis ◽  
Formation Processes ◽  
Picosecond Laser Photolysis

Photochemical reactions of charge-transfer complexes. The irradiation of the charge-transfer complexes between 1,4-, 1,5-, and 2,3-dimethoxynaphthalenes and 1,2-dicyanoethylenes

1980 ◽  
Vol 58 (9) ◽  
pp. 918-927 ◽  
Author(s):  
P. C. Wong ◽  
D. R. Arnold
Keyword(s):  
Charge Transfer ◽  
Triplet State ◽  
Ion Pair ◽  
Photochemical Reactions ◽  
Association Constants ◽  
Charge Transfer Complexes ◽  
Polar Solvents ◽  
Photostationary State ◽  
Ct Complex ◽  
Ct Complexes

The first part of this paper describes the experimental search for a donor which would complex preferentially one of the isomers of 1,2-dicyanoethylene. This involved measuring the association constants (KcDA) of the charge-transfer (ct) complexes of several dimethoxynaphthalenes (DMN) with maleonitrile (MN) and fumaronitrile (FN). From the measured KcDA, we found that MN complexes more strongly than FN with 1,4- and 1,5-DMN but that FN complexes more strongly with 2,3-DMN than does MN. These results are explained in terms of more than one favourable geometry for the ct complexes, since the donors are relatively large compared to the acceptors.Irradiation of the ct complexes between 1,4-, 1,5-, or 2,3-DMN and 1,2-dicyanoethylene led to isomerization of the olefins. The photostationary state depends on the absorption spectra of the ct complexes formed between the donor and the isomeric olefins. From spectroscopic and photo-CIDNP studies, we find evidence that the isomerization in polar solvents takes place via the triplet state of the olefin. The triplet is formed from the radical ion pair resulting after excitation of the ct complex.

Charge-transfer stabilization of molecular bicimers: ion pair formation in diarylmethanes

1988 ◽  
Vol 92 (7) ◽  
pp. 1703-1705 ◽  
Author(s):  
R. J. Locke ◽  
Steve H. Modiano ◽  
E. C. Lim
Keyword(s):  
Charge Transfer ◽  
Ion Pair ◽  
Pair Formation ◽  
Ion Pair Formation

scholarly journals Charge-transfer complexes of 2,3-dichloro-5,6-dicyano-1,4-benzoquinone with amino molecules in polar solvents

2015 ◽  
Vol 149 ◽  
pp. 75-82 ◽  
Author(s):  
Silvia Berto ◽  
Enrico Chiavazza ◽  
Valentina Ribotta ◽  
Pier Giuseppe Daniele ◽  
Claudia Barolo ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Charge Transfer Complexes ◽  
Polar Solvents

SUBSTITUTION AT OCTAHEDRAL CENTERS: II. EFFECT OF SALTS UPON THE RATE OF HYDROLYSIS OF THE HALOPENTAMMINECHROMIUM(III) IONS

1961 ◽  
Vol 39 (11) ◽  
pp. 2371-2379 ◽  
Author(s):  
T. P. Jones ◽  
W. E. Harris ◽  
W. J. Wallace
Keyword(s):  
Charge Transfer ◽  
Transfer Effect ◽  
Ion Pair ◽  
Pair Formation ◽  
Sodium Salts ◽  
Rate Acceleration ◽  
Rate Of Hydrolysis ◽  
A Charge ◽  
Hydrolysis Of ◽  
Octahedral Configuration

A study of the hydrolysis of the halopentamminechromium(III) ions in the presence of the sodium salts of weak acids reveals a rate acceleration due to specific ion-pair formation. The acceleration is due partly to a charge-transfer effect and partly to the fact that the ion helps to maintain the octahedral configuration of the complex in the transition state. It is concluded that the reaction occurs by dissociation, but without collapse of the structure to a five-co-ordinated intermediate.

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