The Application of Non-Linear Free Energy Relationships to Parachors (P) Of Some Aromatic and Aliphatic Compounds

Parachors

Abstract

The present study involves the effect of substituents on parachors (P) of five aromatic and five aliphatic series. Non-linear Hammett and Taft correlations for both aromatic and aliphatic series were observed. Both the plots gave negative slopes (r and r*) for electron donating groups and positive slopes (r and r*) for electron withdrawing groups. The plots of  aromatic series had intersecting point at H (Hammett s = 0) and the plots of aliphatic series had their intersecting point at CH₃ (Taft s* = 0). We are the first ones to observe the conformity of LFER to the physical property parachor. Plausible interpretations for the conformity of LFER to parachors are presented.