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Molecular structure of tryptamine in gas phase according to gas electron diffraction method and quantum chemistry calculations
The molecular structure of tryptamine was studied by gas-phase electron diffraction (GED) and quantum chemical calculations (DFT/B3LYP and MP2 methods with cc-pVTZ basis set). The best fit of the experimental scattering intensities (R-factor = 3.8%) was obtained for the four-conformer model. The exp...
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Published in: | Journal of molecular structure 2017-11, Vol.1148, p.179-184 |
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Main Authors: | , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | The molecular structure of tryptamine was studied by gas-phase electron diffraction (GED) and quantum chemical calculations (DFT/B3LYP and MP2 methods with cc-pVTZ basis set). The best fit of the experimental scattering intensities (R-factor = 3.8%) was obtained for the four-conformer model. The experimental structural parameters are found to be in good agreement with the results of theoretical calculations. The geometric parameters of gaseous tryptamine are compared with those in the crystal phase. The standard enthalpy of formation of tryptamine in the gas phase was calculated using Gaussian-4 theory, yielding value of 133.6 ± 3.3 kJ/mol.
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•Equilibrium molecular structure of tryptamine in gas phase.•The A+G−G+ and A+G−G− conformers are the most abundant.•Standard heat of formation estimation for tryptamine by Gaussian-4 calculations. |
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ISSN: | 0022-2860 1872-8014 |
DOI: | 10.1016/j.molstruc.2017.07.016 |