Polarographic Studies of the Ion-pair Formation and Conjugation Reactions of Acetate and Benzoate Ions in Acetonitrile
Masashi Hojo,Yoshihiko Imai +1 more
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TLDR
In this article, a homoconjugated A−(A−) formed a homomorphic A− (HA)2 with 2 molecules of acetic acid in the presence of a large excess of HA in an acetonitrile solution, and the equilibrium constant was evaluated as 1.1×104 from the shift in the anodic half-wave potential of the acetate ion.Abstract:
An acetate ion (A−) formed a homoconjugated species, A− (HA)2, with 2 molecules of acetic acid (HA) in the presence of a large excess of HA in an acetonitrile solution. In the presence of both acetic acid and LiClO4, one molecule of HA was derived from A− (HA)2 by means of a lithium ion to from an ion-paired species, HA2−Li, as follows: A−(HA)2+Li+\oversetKex\ightleftharpoonsHA2−Li++HA. The equilibrium constant, Kex, was evaluated as 1.1×104 from the shift in the anodic half-wave potential of the acetate ion. As for the benzoate ion (A′−) and HA′, similar reactions occured, and the constant of the exchange reaction was evaluated as 6×103. The effect of the sodium ion and HA (or HA′) on the A− (or A′−) ion was complicated. On the other hand, the presence of [M(A′)2]− (M=Li, Na, K) was proved by the shift of the cathodic wave of the alkali metal.The addition of water caused the apparent stability constant of [Li(A′)2]− to decrease extremely.read more
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Schiff's Bases and Crown Ethers as Supramolecular Sensing Materials in the Construction of Potentiometric Membrane Sensors
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Relationship between Triple Ion Formation Constants and the Salt Concentration of the Minimum in the Conductometric Curves in Low-Permittivity Solvents
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Polarographic study of the interaction between heavy metal ions and some macrocyclic ligands in binary Acctonitrile + water mixtures
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1H and 13C NMR Detection of the Carbocations or Zwitterions from Rhodamine B Base, a Fluoran-Based Black Color Former, Trityl Benzoate, and Methoxy-Substituted Trityl Chlorides in the Presence of Alkali Metal or Alkaline Earth Metal Perchlorates in Acetonitrile Solution
TL;DR: The cleavage of C-O bonds in two fluoran-based dyes by the addition of alkali metal (M+ = Li+, Na+) and alkaline earth metal (mg2+ = Mg2+, Ba2+) perchlorates in acetonitrile solution was examined by means of UV-visible absorption and 1H and 13C NMR spectroscopy at room temperature as discussed by the authors.
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Interaction between halide anions and lithium and substituted-ammonium cations or acids in acetonitrile by direct current polarography
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References
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Critical study involving water, methanol, acetonitrile, N,N-dimethylformamide, and dimethyl sulfoxide of medium ion activity coefficients, .gamma., on the basis of the .gamma.AsPh4+ = .gamma.BPh4- assumption
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I. M. Kolthoff,M. K. Chantooni +1 more