Abstract
Three crystalline modifications of 2-aminobenzoic acid (anthranilic acid) have been studied by 13C CP/MAS and 1H CRAMPS NMR. The peaks are assigned and discussed in relation to (a) the neutral or zwitterionic nature of the molecules, (b) the crystal structures, known for two of the polymorphs, (c) residual ( N,C) dipolar splittings, (d) hydrogen bonding and (e) dynamic exchange. The value of applying both types of spectroscopy to such studies is stressed.
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