N.m.r. measurements were carried out on aqueous solutions of ortho, meta and para-hydroxybenzoate ions. Only the ortho isomer, salicylate, gave evidence for specific dimer formation in the ground state. From the concentration dependence of the chemical shifts of particular protons a π-bonded structure is derived for the dimer.
G. Stein and M. Tomkiewicz, Trans. Faraday Soc., 1970, 66, 517 DOI: 10.1039/TF9706600517
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