Ionic dissociation in complexes of iodine with triphenylarsine and triphenylstibine

1991 ◽  
Vol 69 (4) ◽  
pp. 606-610 ◽  
Author(s):  
Ying Ru Zhang ◽  
Ira Solomon ◽  
Seymour Aronson
Keyword(s):  
Complex Formation ◽  
Chemical Nature ◽  
Equilibrium Constants ◽  
Electrochemical Technique ◽  
High Iodine ◽  
Ionic Complex ◽  
Ionization Mechanisms ◽  
Iodine Complex ◽  
Ionic Dissociation ◽  
Iodine Complexes

An electrochemical technique has been employed to study the ionization of the iodine complexes of (C6H5)3As, (C6H5)3Sb, and pyridine. Several different ionization mechanisms are proposed depending on the chemical nature and concentration of the reactants. A new ionic complex, (C6H5)3MI22+ is postulated for the interaction of iodine with (C6H5)3As and (C6H5)3Sb at high iodine concentrations. Equilibrium constants have been calculated from the emf data for the various ionization steps. Key words: triphenylarsine, triphenylstibine, iodine, complex formation, ionization.

Ionic dissociation in complexes of iodine with triphenylphosphine and triphenylamine

1992 ◽  
Vol 70 (9) ◽  
pp. 2394-2397 ◽  
Author(s):  
Ying Ru Zhang ◽  
Seymour Aronson ◽  
P. Gary Mennitt
Keyword(s):  
Nitrogen Compound ◽  
Ionic Species ◽  
Electrochemical Technique ◽  
High Iodine ◽  
Ionic Dissociation ◽  
Chemical Shift Data ◽  
Comparison Of The Results ◽  
Doubly Charged ◽  
Shift Data ◽  
Iodine Complexes

An electrochemical technique has been employed to study the ionization of the iodine complexes of (C6H5)3N and (C6H5)3P. Comparison of the results with a previous study indicates that, at high iodine concentrations, the phosphorus compound behaves like (C6H5)3As and (C6H5)3Sb with the formation of a doubly charged ionic species, (C6H5)3PI22+. The nitrogen compound resembles pyridine in its behavior. Chemical shift data on the (C6H5)3P–I2 system using 31P NMR indicates the presence of additional equilibrium processes.

Ionic dissociation in pyridine–iodine solutions

1986 ◽  
Vol 64 (10) ◽  
pp. 2060-2063 ◽  
Author(s):  
Seymour Aronson ◽  
Stuart Bryan Wilensky ◽  
Taun-Iuan Yeh ◽  
Darnel Degraff ◽  
Grace Marilyn Wieder
Keyword(s):  
Experimental Data ◽  
Ionic Species ◽  
Electrochemical Technique ◽  
Iodine Complex ◽  
Ionic Dissociation ◽  
Pyridine Concentration

An electrochemical technique has been employed to study the ionization of the pyridine–iodine complex in pure pyridine and in 1,2-dichloroethane. A mechanism for the ionization in accord with the experimental data is proposed. The results indicate that, for wide ranges of iodine and pyridine concentration, one quarter of the I2 is dissociated into ionic species.

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 CHEMICAL NATURE OF MACROPHAGE RNA-ANTIGEN COMPLEXES AND THEIR RELEVANCE TO IMMUNE INDUCTION

1969 ◽  
Vol 130 (3) ◽  
pp. 557-574 ◽  
Author(s):  
Georges E. Roelants ◽  
Joel W. Goodman
Keyword(s):  
Amino Acids ◽  
Complex Formation ◽  
Chemical Nature ◽  
Divalent Cations ◽  
Chelating Agent ◽  
Total Absence ◽  
Synthetic Polypeptides ◽  
Antigen Complex ◽  
Anionic Groups ◽  
Do So

10 different compounds, including natural and synthetic polypeptides, proteins, polysaccharides, amino acids, and steroid hormones, were assayed for their capacity to form complexes with peritoneal exudate cell RNA. Only molecules carrying negatively charged groups were able to do so. The formation of RNA-antigen complexes was unrelated to the immuno-potency of the "antigen," was not an enzyme-dependent reaction, did not require the synthesis of RNA following introduction of the antigen, did not seem to involve antigen-specific RNAs, was not specific for macrophages, since HeLa cells could be used as effectively, and occurred when purified RNA was mixed with antigen only in the presence of divalent cations. The complexes were very stable, once formed, but could be dissociated by exhaustive dialysis against buffers containing a chelating agent. The macrophage RNA-antigen complex therefore appears to be a chelate between anionic groups on the two components. Based on the total absence of a relationship between immunogenicity and the capacity to form such complexes, as well as the nonspecific nature of complex formation at every level examined, it appears unlikely that RNA-antigen complexes play a physiologically significant role in immune induction.

scholarly journals Poly(vinyl alcohol)-Iodine Complex in Poly(vinyl alcohol) Films Soaked at High Iodine Concentrations

1990 ◽  
Vol 22 (7) ◽  
pp. 638-642 ◽  
Author(s):  
Hiromi Sakuramachi ◽  
Yoon-So Choi ◽  
Keizo Miyasaka
Keyword(s):  
Vinyl Alcohol ◽  
Poly Vinyl Alcohol ◽  
High Iodine ◽  
Iodine Complex

Competitive Influence of Carboxylic Groups in Ionic Complex Formation of 4-Hydroxybenzylidene Alkanones with Polyamidines

2004 ◽  
Vol 37 (22) ◽  
pp. 8389-8393 ◽  
Author(s):  
Marina M. Dudkina ◽  
Andrey V. Tenkovtsev ◽  
Hartmut Komber ◽  
Liane Häussler ◽  
Frank Böhme
Keyword(s):  
Complex Formation ◽  
Ionic Complex ◽  
Carboxylic Groups

Note on the Influence of External Heavy-Atom Perturbers on the Phosphorescence Spectrum of Triphenylene

1984 ◽  
Vol 39 (11) ◽  
pp. 1145-1146 ◽  
Author(s):  
M. Zander
Keyword(s):  
Complex Formation ◽  
Methyl Iodide ◽  
Ground State ◽  
Chemical Nature ◽  
Heavy Atom ◽  
Phosphorescence Spectrum ◽  
Symmetry Reduction ◽  
Spectral Changes ◽  
Silver Perchlorate ◽  
Phosphorescence Spectra

Spectral changes in symmetry-forbidden phosphorescence spectra observed in the presence of external heavyatom perturbers may have quite different causes depending on the chemical nature of the perturber. This is exemplified using triphenylene as the phosphorescent compound and methyl iodide and silver Perchlorate respectively as the perturber. Intensification of the 0-0 band of the symmetry-forbidden phosphorescence spectrum of triphenylene by silver Perchlorate is assumed to result from symmetry-reduction of the hydrocarbon by ground-state complex formation with silver Perchlorate.

1-Iodoacétylènes. IV. Relations structure–réactivité pour la complexation des 1-iodoacétylènes substitués avec des bases de Lewis

1983 ◽  
Vol 61 (1) ◽  
pp. 135-138 ◽  
Author(s):  
Christian Laurence ◽  
Michèle Queignec-Cabanetos ◽  
Bruno Wojtkowiak
Keyword(s):  
Complex Formation ◽  
Triple Bond ◽  
Vibrational Frequency ◽  
Chemical Shifts ◽  
Structural Parameters ◽  
Equilibrium Constants ◽  
Lewis Acidity ◽  
Frequency Shifts ◽  
Substituent Constants ◽  
Substituted 1

The equilibrium constants for complex formation between the substituted 1-iodoacetylènes 1–8 and the vibrational frequency shifts induced by complex formation are related to the electronic substituent constants. The 13C chemical shifts of the triple bond are also useful structural parameters for predicting the Lewis acidity of iodoalkynes.

Studies of complex formation from permittivity measurements: a statistical reexamination

1992 ◽  
Vol 70 (7) ◽  
pp. 1873-1878 ◽  
Author(s):  
Otto Exner
Keyword(s):  
Dipole Moment ◽  
Complex Formation ◽  
Classical Method ◽  
Dipole Moments ◽  
Equilibrium Constants ◽  
Statistical Treatment ◽  
Statistical Procedure ◽  
Variable Ratio ◽  
Transformation Of Variables ◽  
Permittivity Measurements

Permittivity measurements on solutions of two compounds present in a variable ratio may reveal complex formation: both the equilibrium constant and the dipole moment of the complex can be in principle estimated. However, an incorrect statistical treatment involving transformation of variables is used quite often, for example, in the classical method of Few and Smith. In this case the estimates obtained are usually biased, or loaded with such a great uncertainty that they are practically worthless. The results of numerous papers, even some recent ones, are thus completely at variance with facts. This is shown in this paper by recalculating equilibrium constants and dipole moments of the complex in 17 examples from the literature. Simultaneously, a correct and simple statistical procedure is suggested. The danger of an incorrect and (or) incomplete statistical treatment may be encountered, for the same reason, even in other, quite different, areas.

Sign in / Sign up

Export Citation Format

Share Document