ChemInform Abstract: MOLECULAR MOTION IN CIS- AND TRANS-DICHLOROTETRAAMMINE-COBALT(III) CHLORIDE BY PROTON MAGNETIC RESONANCE

1973 ◽  
Vol 4 (50) ◽  
pp. no-no
Author(s):  
S. E. ULRICH ◽  
B. A. DUNELL
Keyword(s):  
Magnetic Resonance ◽  
Proton Magnetic Resonance ◽  
Molecular Motion ◽  
Cis And Trans ◽  
In Cis

The Interaction of Sulfite Ion with 2,4,6-Trinitrobenzaldehyde: Kinetic, Equilibrium, and Proton Magnetic Resonance Studies

1973 ◽  
Vol 51 (23) ◽  
pp. 3927-3935 ◽  
Author(s):  
Neven Marendic ◽  
Albert Richard Norris
Keyword(s):  
Proton Magnetic Resonance ◽  
Equilibrium Constants ◽  
Visible Absorption ◽  
Rapid Formation ◽  
Aqueous Dimethylsulfoxide ◽  
Cis And Trans ◽  
In Cis ◽  
Kinetics Of ◽  
Sulfite Ion ◽  
Kinetic Equilibrium

Sulfite ion reacts with 2,4,6-trinitrobenzaldehyde in aqueous solution of ionic strength 0.14 M to yield a 1:1 σ-complex at low sulfite concentrations and a 2:1 σ-complex at high sulfite concentrations. The visible absorption characteristics of these two σ-complexes as well as equilibrium constants and relevant thermodynamic parameters for their formation have been determined. P.m.r. studies demonstrate that two isomeric forms of the 1:1 σ-complex occur in aqueous dimethylsulfoxide solution and two isomeric forms of the 2:1 σ-complex occur in water. In both the 1:1 and the 2:1 complexes isomers are found which contain sulfite ion attached to the C-1 carbon and one of the isomeric 2:1 σ-complexes is postulated to exist in cis and trans forms. Observations are presented concerning the kinetics of the very rapid formation of the 1:1 σ-complex in water.

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