The protonation of thiourea was reinvestigated in aqueous and non-aqueous media using potentiometric, UV-vis, NMR, MS spectroscopy, as well as DFT calculations. In aqueous medium, no evidence for protonation could be found in the pH range 0 to 7, in agreement with typical pK a values (acid dissociation constants of protonated thiourea) quoted in the literature of around Ϫ1.2. Most of the protonation constants quoted in the lite-
+ (pap) and [Pt(terpy)Cl] + (ppp) was studied in the selected solvents. In the case of alcoholic solutions, an increase in the substitution rate with increasing length of the carbon chain was observed, which is ascribed to the possible
When normal is a surprise: Studies of a ligand‐substitution reaction of a PtII complex (see picture; apa: 2,6‐bis(aminomethyl)pyridine) in water, methanol, and the ionic liquid 1‐butyl‐3‐methylimidazolium bis(trifluoromethylsulfonyl)amide reveal that the ionic liquid behaves “normally”, that is, as any other solvent. In the ionic liquid, changes in the polarity of the transition state only play a minor role.
Wenn Normalsein überrascht: Bei der Untersuchung eines Ligandenaustauschs an einem PtII‐Komplex (siehe Bild; apa: 2,6‐Bis(aminomethyl)pyridin) in Wasser, Methanol und der ionischen Flüssigkeit 1‐Butyl‐3‐methylimidazolium‐bis(trifluormethylsulfonyl)amid stellte sich heraus, dass sich die ionische Flüssigkeit „normal“ verhält, d. h. wie jedes andere Solvens. Änderungen in der Polarität des Übergangszustands spielen in ihr nur eine untergeordnete Rolle.
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