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 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 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.

Chemical‐Shift Data for Water and Aqueous Solutions

1966 ◽  
Vol 45 (9) ◽  
pp. 3296-3298 ◽  
Author(s):  
Heinrich H. Rüterjans ◽  
Harold A. Scheraga
Keyword(s):  
Chemical Shift ◽  
Aqueous Solutions ◽  
Chemical Shift Data ◽  
Shift Data

scholarly journals Bayesian inference of protein structure from chemical shift data

PeerJ ◽  
2015 ◽  
Vol 3 ◽  
pp. e861 ◽  
Author(s):  
Lars A. Bratholm ◽  
Anders S. Christensen ◽  
Thomas Hamelryck ◽  
Jan H. Jensen
Keyword(s):  
Protein Structure ◽  
Bayesian Inference ◽  
Chemical Shift ◽  
Chemical Shift Data ◽  
Shift Data

scholarly journals Cyclic Peroxides from a Two-Sponge Association of Plakortis communis-Agelas mauritiana

2013 ◽  
Vol 8 (6) ◽  
pp. 1934578X1300800
Author(s):  
Pinus Jumaryatno ◽  
Lynette K. Lambert ◽  
John N. A. Hooper ◽  
Joanne T. Blanchfield ◽  
Mary J. Garson
Keyword(s):  
2D Nmr ◽  
Side Chain ◽  
Relative Configuration ◽  
Carboxylic Acid Groups ◽  
Rp Hplc ◽  
Chemical Shift Data ◽  
New Compounds ◽  
Cyclic Peroxide ◽  
Related Compounds ◽  
Shift Data

A cyclic peroxide 1 with an unusual phenethenyl side chain, together with the known peroxide 2 with a C4-sidechain have been isolated from a two-sponge association of Plakortis communis – Agelas mauritiana (Carter, 1883) collected near Mooloolaba, South-East Queensland, Australia. Metabolite purification was complicated by the presence of the free carboxylic acid groups in 1 and 2; therefore, diazomethane treatment was undertaken to afford methyl ester 3. Following RP-HPLC purification, the ring-opened analogues 4 and 5 were also obtained. The structures of the new compounds were elucidated on the basis of their 1D and 2D NMR and MS data, and by comparison with literature data. The relative configuration of the isolated peroxides was determined by the interpretation of JH-H values and comparison of the 13C chemical shift data with literature data for related compounds. The bromopyrrole alkaloid longamide (6) was also isolated.

Complex fluoroanions in solution. XI. Complexes of silicon, germanium, and titanium tetrafluorides with simple anions

1980 ◽  
Vol 58 (14) ◽  
pp. 1407-1411 ◽  
Author(s):  
S. Brownstein
Keyword(s):  
Magnetic Resonance ◽  
Chemical Shift ◽  
Silicon Germanium ◽  
Chemical Shift Data ◽  
Shift Data

A fluorine-bridged silicon fluoroanion and many hexa-co-ordinate germanium and titanium fluoroanions have been identified in solution via fluorine magnetic resonance. A generalized shceme is used to correlate all fluorine chemical shift data for hexa-coordinate fluorine containing species.

The chemistry of pyrrolic compounds. LV. 13C chemical shift data for the isomeric protoporphyrins

1984 ◽  
Vol 37 (2) ◽  
pp. 335 ◽  
Author(s):  
RJ Abraham ◽  
PS Clezy ◽  
Lv Thuc
Keyword(s):  
Chemical Shift ◽  
Side Chain ◽  
Methine Carbon ◽  
Chemical Shift Data ◽  
13C Chemical Shift ◽  
Derivatives Of ◽  
Shift Data

The 13C n.m.r, spectra of the 15 isomeric protoporphyrin dimethyl esters have been determined. Measurements were made on the zinc chelate derivatives of the porphyrins in the presence of pyrrolidine and assignments are given for the side chain and methine carbon atoms.

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