1. Experimental and theoretical studies of 4-hydroxy-1-methylpiperidinium perchlorate
- Author
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Dega-Szafran, Zofia, Katrusiak, Andrzej, and Szafran, Mirosław
- Subjects
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PERCHLORATES , *HYDROGEN bonding , *X-ray diffraction , *NUCLEAR magnetic resonance spectroscopy - Abstract
Abstract: The structure of 4-hydroxy-1-methylpiperidinium perchlorate has been characterized by X-ray diffraction, FTIR, Raman and NMR spectroscopies, and by DFT calculations. The crystals belong to orthorhombic Pbca group. The piperidine ring has a chair conformation with the hydroxyl and methyl groups in the equatorial positions. The hydroxyl group interacts by bifurcated O–H···O hydrogen bonds with the ClO4 − anion of 2.905(5) and 3.045(5)Å. Two optimized structures of the title compound have been calculated by the B3LYP/6–31G(d,p) approach. In one of them the anion is involved in the N+–H···O hydrogen bonds of 2.629Å, while in the other the anion interacts electrostatically with the N+ atom of the 4-hydroxy-1-methylpiperidinium cation. In aqueous solution two 4-hydroxy-1-methylpiperidinium perchlorates are in the conformational equilibrium. Their conformations are discussed on the basis of the NMR spectra. The solid state FTIR spectrum is consistent with the X-ray data. [Copyright &y& Elsevier]
- Published
- 2008
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