Theoretical analysis of Lewis basicity based on local electron-donating ability. Origin of basic strength of cyclic amines

Defining quantatively the intrinsic origin of the strength of gas-phase Lewis basicity of the cyclic amines, in particular, based on the local electron-donating ability of the amine nitrogen atoms. The present work shows that a well-defined local property of the amine nitrogen atoms can aid understanding of the Lewis basicity of the cyclic amines.