2019-6-26 · The basicity of amines depends on: The electronic properties of the substituents (alkyl groups enhance the basicity, aryl groups diminish it). The degree of solvation of the protonated amine, which includes steric hindrance by the groups on nitrogen.; Electronic effects. Owing to inductive effects, the basicity of an amine might be expected to increase with the number of alkyl groups on the amine.