Charge-transfer complexes. Part III. Solvent shifts of the charge-transfer band of complexes formed between halide ions and organic electron acceptors

1967 ◽  
pp. 1128 ◽  
Author(s):  
K. M. C. Davis
Keyword(s):  
Charge Transfer ◽  
Charge Transfer Band ◽  
Electron Acceptors ◽  
Charge Transfer Complexes ◽  
Halide Ions ◽  
Organic Electron ◽  
Solvent Shifts

Charge transfer complexes of diquat and paraquat with halide anions

1987 ◽  
Vol 65 (10) ◽  
pp. 2425-2427 ◽  
Author(s):  
S. G. Bertolotti ◽  
J. J. Cosa ◽  
H. E. Gsponer ◽  
C. M. Previtali
Keyword(s):  
Charge Transfer ◽  
Charge Transfer Band ◽  
Association Constants ◽  
Charge Transfer Complexes ◽  
Ion Selective Electrodes ◽  
Halide Ions ◽  
Ultraviolet Spectrophotometry ◽  
A Charge ◽  
Difference Absorption ◽  
Absorption Measurements

The association of methylviologen, 1,1′-dimethyl-4,4′-bipyridynium (PQ2+), with halide and pseudo-halide ions was studied in water at 25 °C by ultraviolet spectrophotometry. A charge transfer band could be observed in the region around 300 nm. From difference absorption measurements the first association constant (K1,) was obtained as 1.7 (Cl−), 3.3 (Br−), 3.9 (I−), 0.7 (CN−), and 2.0(SCN−) M−1. Similar results were obtained for the dication, 6,7-dihydrodipyrido[1,2-a:2′,1′-c]pyrazinium (DQ2+), with first association constants 3.3 (Cl−), 4.1 (Br−) and 4.6 (I−) M−1. First and second (K2) association constants were also determined by a potentiometric technique using ion selective electrodes: K1 = 2.0 M−1; K2 = 0.4 M−1 for the system PQ2+–Cl− and K1 = 5.3 M−1; K2 = 0.3 M−1 for DQ2+Br−.

Ferrocene-modified oligopeptide as model compound for charge-transfer interactions with organic electron acceptors

2001 ◽  
Vol 18 (1-2) ◽  
pp. 121-124 ◽  
Author(s):  
Marek Pietraszkiewicz ◽  
Agnieszka Wieckowska ◽  
Renata Bilewicz ◽  
Aleksandra Misicka ◽  
Lucjan Piela ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Model Compound ◽  
Electron Acceptors ◽  
Organic Electron
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