Mécanisme d'apparition de la coloration jaunâtre dans les poudres de sulfate stanneux

1977 ◽  
Vol 55 (19) ◽  
pp. 3425-3428
Author(s):  
G. Verville
Keyword(s):  
Charge Transfer ◽  
Spectrophotometric Study ◽  
Charge Transfer Complexes ◽  
Yellow Coloration ◽  
Hydrolysis Of

A spectrophotometric study of stannous sulphate powders has enabled the mechanism of the yellow coloration of these powders to be defined. It is shown that the yellow coloration results from the formation of charge transfer complexes of the type 1Sn(II)–4Sn(IV) in a film of adsorbed and acidified water which surrounds some stannous sulphate particles. The charge transfer complexes are formed by the adsorption of Sn2+•xH2O or SnHSO4+ ions onto the surface of colloidal Sn(OH)4•xH2O that is formed by the oxidation and hydrolysis of the stannous sulphate.

Chemical and spectroscopic studies in metal β-diketonates. IX. A novel intermolecular charge-transfer system involving metal acetylacetonate (donor) and iodine (acceptor)

1970 ◽  
Vol 23 (2) ◽  
pp. 269 ◽  
Author(s):  
PR Singh ◽  
R Sahai
Keyword(s):  
Charge Transfer ◽  
Equilibrium Constants ◽  
Spectrophotometric Study ◽  
Spectroscopic Studies ◽  
Charge Transfer Complexes ◽  
Transfer System ◽  
Metal Acetylacetonates ◽  
Iodine Complex ◽  
Straight Line ◽  
Metal Acetylacetonate

A spectrophotometric study of 1 : 1 charge-transfer complexes derived from five metal acetylacetonates (donor) and iodine (acceptor) has been carried out. Iomzation potential of each metal acetylacetonate and the equilibrium constants for the formation of the chelate-iodine complex have been evaluated. The plot of ionization potential of donors against hvCt values gave a straight line.

scholarly journals Spectrophotometric study on the charge transfer complex between sumatriptan succinate and some π-acceptors and alizarin derivatives

2013 ◽  
Vol 19 (4) ◽  
pp. 529-540 ◽  
Author(s):  
Sheikh El ◽  
Ayman Gouda ◽  
Rham El-Azzazy
Keyword(s):  
Charge Transfer ◽  
Standard Addition ◽  
Spectrophotometric Study ◽  
Molar Absorptivity ◽  
Charge Transfer Complexes ◽  
Alizarin Red ◽  
Spectrophotometric Methods ◽  
Sumatriptan Succinate ◽  
Relative Standard

A facile, accurate, sensitive and validated spectrophotometric methods for the determination of sumatriptan succinate (SMT) in pure and in dosage forms are described. The methods are based on the formation of charge transfer products between SMT and chromogenic reagents 2,3-dichloro-5,6 dicyano-p-benzoquinone (DDQ), 7,7,8,8-tetracyanoquinodimethane(TCNQ), quinalizarin (Quiz) and alizarin red S (ARS) producing charge transfer complexes which showed an absorption maximum at 461, 841, 567 and 529 nm for DDQ, TCNQ, Quiz and ARS, respectively. The optimization of the reaction conditions such as the type of solvent, reagent concentration and reaction time were investigated. Beer?s law is obeyed in the concentration ranges 1.0-80 mg mL-1. The molar absorptivity, Sandell sensitivity, detection and quantification limits are also calculated. The correlation coefficient was ?0.9994 with a relative standard deviation (R.S.D.) of ? 1.08. The proposed methods were successfully applied for determination of sumatriptan in tablets with good accuracy and precision and without interferences from common additives by applying the standard addition technique. Developed methods have been validated statistically for their accuracy, precision, sensitivity, selectivity, robustness and ruggedness as per ICH guidelines and the results compared favourably with those obtained using the reported method.

An electrochemical and spectrophotometric study of some charge-transfer complexes involving drug molecules in acetonitrile

1996 ◽  
Vol 8 (1) ◽  
pp. 66-74 ◽  
Author(s):  
Rowena V. Ball ◽  
George M. Eckert ◽  
Felix Gutmann ◽  
Danny K. Y. Wong
Keyword(s):  
Charge Transfer ◽  
Spectrophotometric Study ◽  
Charge Transfer Complexes ◽  
Drug Molecules
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