Abstract
Ten 1:1 crystalline complexes of N-methylpiperidine betaine with phenols (p K a from 9.55 to 0.33) were synthesised and analysed by UV–vis, 1H and 13C NMR and FTIR spectroscopies. The UV–vis spectra of complexes of moderately strong phenols show separate bands for A–H⋯B and A −⋯HB + species. Sigmoidal plots of proton and carbon chemical shifts of the N +CH 2 group versus p K a values of phenols and changes of absorption in FTIR spectra in the 3200–1800 and 1500–400 cm −1 regions additionally confirmed the A–H⋯B⇌A −⋯H–B + equilibrium in the complexes investigated.
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