IODINE COMPLEXES IN INERT SOLVENTS. VII. THERMODYNAMIC CONSTANTS AND SPECTROSCOPIC DATA FOR THE REACTION IN CARBON TETRACHLORIDE

1957 ◽  
Vol 35 (6) ◽  
pp. 573-576 ◽  
Author(s):  
P. A. D. De Maine
Keyword(s):  
Carbon Tetrachloride ◽  
Spectroscopic Data ◽  
Thermodynamic Constants ◽  
Iodine Complexes

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Study of the Infrared Absorption Spectra of Some Pyridine Derivatives-Iodine Complexes

1976 ◽  
Vol 30 (2) ◽  
pp. 200-204 ◽  
Author(s):  
F. M. Abdel Kerim ◽  
F. Abou El Fotouh
Keyword(s):  
Complex Formation ◽  
Absorption Spectra ◽  
Infrared Absorption ◽  
Ir Absorption ◽  
Pyridine Derivatives ◽  
Thermodynamic Constants ◽  
Ir Absorption Spectra ◽  
Infrared Absorption Spectra ◽  
The Stability ◽  
Iodine Complexes

The ir absorption spectra of some pyridine derivatives-iodine complexes were measured in the region 400 to 1400 cm−1 and the results are discussed. The effect of complex formation on the intensities of some of the bands was investigated. The thermodynamic constants of these complexes were calculated. It was found that the stability of the complex depends to a large extent on the electronegativity as well as the position of the substituent on the pyridine nucleus. The structures of formed complexes are discussed.

scholarly journals The absorption spectra of halogens and inter-halogen compounds in solution in carbon tetrachloride

1929 ◽  
Vol 124 (795) ◽  
pp. 604-616 ◽  
Keyword(s):  
Absorption Spectrum ◽  
Carbon Tetrachloride ◽  
Absorption Spectra ◽  
Spectroscopic Data ◽  
Chemical Interaction ◽  
Chemical Compounds ◽  
Absorption Bands ◽  
Halogen Compounds ◽  
Inert Solvent ◽  
The Mean

When two solutions are mixed the absorption spectrum of the new solution will be the mean of those of the separate solutions provided that no chemical interaction occures. The mere fact of a departure from additivity does not, however, necessarily denote the formation of true chemical compounds. The solute or solutes may undergo solvation, loosely bound aggregates may occur, and even when marked deviations from the simple law of mixtures are observed it is rarely possible to prove the quantitative formation of a given chemical compound from spectroscopic data alone. The above considerations apply with some force to the problem of the absorption spectra of halogens and inter-halogen compounds in an inert solvent. The three elements show perfectly characteristic absorption bands, they are known to interact with the formation of some quite stable compounds, some relatively stable compounds, and some apparently very unstable compounds.

Thermodynamic Constants of Tetracyanoethylene Complexes with Methylated Benzenes

1971 ◽  
Vol 49 (16) ◽  
pp. 2700-2705 ◽  
Author(s):  
S. C. Liao ◽  
R. K. Chan
Keyword(s):  
Free Energy ◽  
Charge Transfer ◽  
Carbon Tetrachloride ◽  
Formation Constants ◽  
Experimental Conditions ◽  
Substituted Benzenes ◽  
Thermodynamic Constants ◽  
Donor Acceptor ◽  
Vertical Ionization Potentials ◽  
Complete Series

Formation constants, and enthalpy, free energy, and entropy changes for the tetracyanoethylene complexes with a complete series of methyl-substituted benzenes have been evaluated from the charge-transfer spectra over a temperature range of 1−50 °C in carbon tetrachloride solutions. From the literature data, it is deduced that various competing side interactions may not be significant compared to 1:1 electron donor–acceptor complex formation under certain experimental conditions. Some correlations among thermodynamic properties and vertical ionization potentials of the donors are discussed.

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