Proton acceptor abilities of heterocyclic compounds determined by stretching vibration bands of the N–H groups of associated molecules

Abstract

Proton acceptor abilities of some heterocyclic compounds of the pyrrole series are determined by data on the self-association of molecules. It is demonstrated that a change in the vibrational frequency ν_ас of the N–H group of associated molecules is observed in the transition from pyrrole to other compounds of this series. This change in the frequency is due to the inductive effect of the introduced structural fragments on the equilibrium electron configuration of the N–H group.