¹³C- and ¹H-NMR Relaxation Investigation of a Polyciclic Nitrogen Compound: 3,3-Dimethyl-1,5-diphenyl-9-hydroxy-bispidinium Iodide

Maurizio Delfini Department of Chemistry, University of Rome Piazzale Aldo Moro, 00100, Rome, Italy

Maria Rosaria Del Giudice Laboratorio Chimica del Farmaco, Istituto Superiore Sanità Viale Regina Elena 299, 00161, Rome, Italy

Guido Settimj Laboratorio Chimica del Farmaco, Istituto Superiore Sanità Viale Regina Elena 299, 00161, Rome, Italy

Elena Gaggelli Department of Chemistry, University of Siena Pian dei Mantellini 44, 53100, Siena, Italy

Gianni Valensin Institute of Chemistry, University of Basilicata Via N. Sauro 85, 85100, Potenza, Italy

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 (τ_C = 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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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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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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¹³C- and ¹H-NMR Relaxation Investigation of a Polyciclic Nitrogen Compound: 3,3-Dimethyl-1,5-diphenyl-9-hydroxy-bispidinium Iodide