A Linear Relationship Between the ¹³C Ester Carbon Chemical Shift and the Melting Point or S to N Transition Temperature of n-Alkyl Esters of Biphenyl -4,4′-Dicarboxylic Acid

Abstract

We present evidence that the relative electron densities at the ester carbon of the symmetrical n-alkyl diesters of biphenyl-4,4′-dicarboxylic acid may determine the relative melting points of homologs in this series. A similar relationship may determine the relative smectic to namatic transition temperatures of the corresponding monoesters. We present a model to rationalize our observations.