13C- and 1H-NMR Relaxation Investigation of a Polyciclic Nitrogen Compound: 3,3-Dimethyl-1,5-diphenyl-9-hydroxy-bispidinium Iodide |
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| Authors: | Maurizio Delfini Maria Rosaria Del Giudice Guido Settimj Elena Gaggelli Gianni Valensin |
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| Institution: | 1. Department of Chemistry , University of Rome Piazzale Aldo Moro , 00100, Rome, Italy;2. Laboratorio Chimica del Farmaco, Istituto Superiore Sanità Viale Regina Elena 299 , 00161, Rome, Italy;3. Department of Chemistry , University of Siena Pian dei Mantellini 44 , 53100, Siena, Italy;4. Institute of Chemistry, University of Basilicata Via N. Sauro 85 , 85100, Potenza, Italy |
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| Abstract: | The rigid polycyclic nitrogen compound was considered as a test for the reliability of internuclear distances calculated by 1H-NMR spin-lattice relaxation rates. The ‘isotropic’ motional correlation time was calculated from 13C relaxation rates (τC = 0.11 ns at 298 K). Dipolar cross-relaxation rates were calculated by measuring non-, mono- and double-selective proton spin-lattice relaxation rates. All the experimental relaxation rates were thoroughly accounted for by dipolar pairwise interactions. Only at high temperatures a certain contribution from the spin rotational mechanism was apparent. |
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| Keywords: | 1H NMR 13C NMR Bispidinol Spin-lattice relaxation rates |
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