High-resolution 1H and 13C NMR of solid 2-Aminobenzoic acid |
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| Affiliation: | 1. Department of Chemistry, Banaras Hindu University, Varanasi 221005, India;2. Department of Chemistry, Kirori Mal College, University of Delhi, Delhi 110007, India;3. Department of Chemistry, Indian Institute of Technology, Roorkee, Uttarakhand 247667, India;1. Department of Laser Studies, School of Physics, Madurai Kamaraj University, Madurai 625021, Tamil Nadu, India;2. Department of Physics, Avinashilingam University, Coimbatore 641043, Tamil Nadu, India;3. Department of Materials Science, School of Chemistry, Madurai Kamaraj University, Madurai 625021, Tamil Nadu, India;4. Indian Institute of Science Education and Research Thiruvananthapuram, Thiruvananthapuram 695016, Kerala, India;1. School of Mechanical and Electric Engineering, Guangzhou University, Guangzhou 510006, China;2. State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;1. Department of Chemistry, Lomonosov Moscow State University, 119991 Moscow, Russia;2. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Leninsky Prospect 47, 119991 Moscow, Russia;3. Rome International Center for Materials Science Superstripes, Via dei Sabelli 119A, 00185 Roma, Italy |
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| 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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