CH24110Simultaneous conformity and non-conformity to Hammett’s linear free energy relationship (LFER): a rarity
There are innumerable instances of series conforming to linear free energy relationships (LFERs) in the literature and appreciable numbers of examples of non-conformity. It is extremely rare or maybe we are the first to report conformity and non-conformity of Hammett’s relationship (LFER) in the same system, the para-substituted phenyl pentazoles. This rarity and a plausible rationale are discussed. This research article requires a good understanding of Hammett’s relationship (LFER), harmonic oscillator model aromaticity (HOMA index) and bond length alternation (BLA). (Image credit: Sanjeev Rachuru.)