Evidence for the Equilibrium and Estimation of the Equilibrium Constants between Molecular Complexes and Trigonal Bipyramidal Adducts of Diaryl Selenide Dibromides in Solution

1995 ◽  
Vol 24 (1) ◽  
pp. 75-76 ◽  
Author(s):  
Warô Nakanishi ◽  
Satoko Hayashi
Keyword(s):  
Equilibrium Constants ◽  
Molecular Complexes ◽  
Trigonal Bipyramidal ◽  
Diaryl Selenide

Comments Concerning "The Effect of Temperature on the Fluorescence Quenching of Perylene by Tetrachloromethane in Mixtures with Cyclohexane and Benzene"

1993 ◽  
Vol 48 (12) ◽  
pp. 1265-1266
Author(s):  
William E. Acree
Keyword(s):  
Fluorescence Quenching ◽  
Equilibrium Constants ◽  
Fluorescence Emission ◽  
Molecular Complexes ◽  
Probe Method ◽  
Effect Of Temperature ◽  
Solvent Solvent

Abstract An indirect spectrofluorometric probe method is developed for calculating equilibrium constants for formation of heterogeneous solvent-solvent molecular complexes from measured fluorescence emission intensities in select systems that exhibit parabolic-shaped Stern-Volmer quenching plots.

Spectral studies on the interaction of iodine with thiazoles

1987 ◽  
Vol 65 (3) ◽  
pp. 468-472 ◽  
Author(s):  
Refat Abdel-Hamid ◽  
Ahmed A. El-Samahy ◽  
Abdel-Hafiz El-Taher ◽  
Hussein El-Sagher
Keyword(s):  
Equilibrium Constants ◽  
Spectral Characteristics ◽  
Molecular Complexes ◽  
Spectral Studies ◽  
Donor Center ◽  
Extinction Coefficients ◽  
Effect Of Solvents ◽  
Different Temperatures ◽  
Donor Acceptor ◽  
Thermodynamic Functions Of Formation

The electron donor–acceptor molecular complexes between thiazole and some of its derivatives and iodine in several solvents have been investigated spectrophotometrically at different temperatures. Spectral characteristics, equilibrium constants, K, extinction coefficients, ε, and thermodynamic functions of formation, ΔH0, ΔG0, and ΔS0 have been determined. It was found that the data fit satisfactorily the 1:1 stoichiometric equilibrium: D + I2 = DI2 "outer complex". The EDA complexes obtained are of "n–σ*" type in which the nitrogen atom of thiazole is the donor center. Moreover, the effect of solvents on the K values is discussed in terms of the solute–solute and solute–solvent competing equilibria.

scholarly journals MOLECULAR COMPLEXES OF MONOAMMONIUM SALT OF GLYCYRRHIZIC ACID WITH SOME UREA AND THEIR ANTIBIOTIC ACTIVITY

2021 ◽  
Vol 19 (3) ◽  
pp. 160-167
Author(s):  
Yu.T. Isaev ◽  
◽  
I.R. Askarov ◽  
S.A. Rustamov ◽  
D.U. Egamberdiev ◽  
...  
Keyword(s):  
Glycyrrhizic Acid ◽  
Fungicidal Activity ◽  
Pathogenic Fungus ◽  
Equilibrium Constants ◽  
Molecular Complexes ◽  
Complex Compounds ◽  
Antibiotic Activity ◽  
Polar Groups ◽  
Ir Spectroscopic ◽  
Complexation Process

This article reports on obtaining the inclusion compounds of the monoammonium-glycyrrhizin salts with urea, thiourea and methylolthiourea. The compounds were obtained by the liquid phase way, and their structures were characterized by the UV- and IR-Spectroscopic methods. Proceeding from the spectral data, it was concluded that the complexation occurs through the interaction of polar groups of the components. The composition of the complexes was studied using the method of isomolar series. Equilibrium constants and changes in Gibbs free energy of the complexation process were also calculated. The biological activity of complex compounds was studied on the example of fungicidal activity of one of the most common pathogenic fungus Fusarium. The obtained compounds can be used as as fungicides and stimulants in agriculture.

Charge-Transfer Complexes of Brominated Polycyclic Aromatic Hydrocarbons

1962 ◽  
Vol 15 (2) ◽  
pp. 278 ◽  
Author(s):  
TM Spotswood
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Charge Transfer ◽  
Aromatic Hydrocarbons ◽  
Charge Transfer Complex ◽  
Equilibrium Constants ◽  
Molecular Complexes ◽  
Charge Transfer Complexes ◽  
Extinction Coefficients ◽  
Polycyclic Aromatic ◽  
Molar Extinction Coefficients

Charge-transfer complex formation between the donors 1-bromonaphthalene. 9-bromophenanthrene, 9-bromoanthracene, 3-bromopyrene, and 7-bromobenz[a]-anthracene and the acceptors iodine, tetrachlorophthalic anhydride, 1,3,5-trinitrobenzene, and 2,4,7-trinitrofluorenone has been investigated. The positions of the charge-transfer absorption maxima, apparent molar extinction coefficients, and equilibrium constants have been determined in carbon tetrachloride solution and the results compared with those for the corresponding unsubstituted polycyclic aromatic hydrocarbons. The positions of the absorption maxima of the charge-transfer bands of the brominated hydrocarbons were anomalous but the apparent molar extinction coefficients and equilibrium constants were similar to those obtained for the parent hydrocarbons. The strength of charge-transfer bonding in molecular complexes of brominated polycyclic aromatic hydrocarbons is shown to be of the same order as that in molecular complexes of the unsubstituted hydrocarbons.

Electrometric studies on molecular complexes. Part 1. Biamperometric study of some molecular complexes of iodine

1986 ◽  
Vol 64 (12) ◽  
pp. 2371-2375
Author(s):  
Ram Adhar Singh
Keyword(s):  
Recent Literature ◽  
Equilibrium Constants ◽  
Molecular Complexes ◽  
The Other ◽  
Separate Determination ◽  
Simple Method ◽  
Dissociation Equilibrium ◽  
Present Technique ◽  
Good Agreement

A simple method for separate determination of thermodynamic parameters of molecular complexes in solution is reported. It is based on a polyiodide dissociation equilibrium in conjunction with the biamperometry. The equilibrium constants and the enthalpies determined by this method are in good agreement with the recent literature data, lending support for the applicability of the method. The advantages of the present technique over the other have been outlined.

Probing massive cold cores discovered by ISO in quiescent galactic molecular complexes

2002 ◽  
Vol 4 ◽  
pp. 133-133
Author(s):  
D. Teyssier ◽  
P. Hennebelle ◽  
M. Pérault
Keyword(s):  
Molecular Complexes
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