. Can. J. Chem. 54, 2458 (1976). The salts (ImH+)X-, Im = imidazole, X-= PFs-, BF4-, or Cl0,-have been prepared in solution, and the perchlorate salt has been crystallised. The molecularity implied by the formula is confirmed in solution by Job's method, and for the crystals gravimetrically. In MeCN the association constant is -8 M-!. Infrared spectra of solution and crystals are similar, independent of counter ion, and indicate an asymmetric single minimum proton potential. The pronounced doublet in the NH stretching band of the H bridged complex, and replaced by a single band in the D bridged analogue, is not indicative of proton tunnelling. The X-ray structure is compatible with this interpretation of the spectra. On a prepare, en solution, les sels (ImH+)X-, Im = imidazole, X-= PFsM, BF4-ou C104-et le sel perchlorate a Ct C cristallisk. La molCcularit6 impliquk par la formule est confirm& en solution par la mCthode de Job et pour les cristaux d'une f a~o n gravimitrique. Dans le MeCN, la constante d'association est approximativement -8 M-1. Les spectres infrarouges en solution et sous forme de cristaux sont similaires, indkpendants de l'anion et indiquent la presence pour le proton d'un potentiel asymktrique comportant un seul minimum. Le doublet t r b prononcC dans la bande NH d'klongation du complexe pontC avec l'hydrogkne qui est remplacC par une bande unique dans l'analogue pontC avec du deuterium, n'indique pas la prCsence d'un effet de tunnel du proton. La structure dCtermin& par rayons-X est compatible avec cette interprktation du spectre.[Traduit par le journal]
A series of hydrogen-bonded cations, (BHB) + where B is a heterocyclic base, have been characterised spectroscopically, and show evidence for a double minimum proton potential.
Sunzmavy A wide series of hydrogen bonded cations (B1HB2)+, where B1 and R2 are different heterocyclic bases, have been characterised spectroscopically, and the proton potential appears to depend on the difference of the pK values of the bases.
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