Sekundäre Isotopeneffekte der Aciditätskonstanten kerndeuterierter Anilinium‐Ionen

Abstract

(1) Acidity constants of 2,3,4,5,6‐d5‐, 2,4,6‐d3‐ and 3,5‐d2‐anilinium ion, of 2,6‐d2−4‐toluidinium and 4‐d‐2,6‐xylidiniumion have been measured in aqueous solution.

Association and Dissociation of Phycocyanin and the Effects of Deuterium Substitution on the Processes*

“…An increase in ionic strength might exert a similar effect by reduction of electrostatic interactions. Side-chain deuteration will change the ionization constants of acidic and basic groups only slightly (Ropp, 1960; Bell and Jensen, 1960;Halevi, 1960;Halevi etal., 1963; Streitwieser and Klein, 1963;Bell and Miller, 1963;Bernasconi et al, 1963), and this change would result in a small shift to higher pH of the isoelectric point. If the association of monomers is simply regulated by electrostatic forces, the association tendency of deuteriophycocyanin would be expected, contrary to observation, to be higher than that of protiophycocyanin.…”

Determination of acidity constants by solvent extraction/flow injection analysis using a dual-membrane phase separator

“…The average value of the pKa for the p-toluidinium ion at an ionic strength of 0.10 and a temperature of 20.0 °C was 5.28 ± 0.013. Literature values determined at 20 °C and an ionic strength of 0.1 are 5.44 (19), 5.21 (20), and 5.159 (21). Since the literature values show considerable variation, we can only say that our value is well within the range of reported values.…”

The Properties of a Ferrocene-Tetracyanoethylene Charge-Transfer Complex

“…More recently the preparation of several metallocenium complexes, formed by the interacton of ferrocene, nickelocene, or cobaltocene with various quinonoid -acceptors has been reported. 6 In the course of our studies of the aromatic properties of the iron group metallocenes, we were led to a careful examination of their reactions with various acceptor components, and report herein the preparation of an isolable charge-transfer complex between ferrocene and tetracyanoethylene (TCNE) whose physical properties are of some theoretical interest.…”