Abstract
The equilibrium structure of the 3,3,6-trimethyl-1,5-diazabicyclo[3.1.0]hexane (TMDABH) molecule was studied for the first time by means of gas-phase electron diffraction (GED) supplemented with quantum chemical calculations. TMDABH exists as a mixture of two conformers of Cs point group symmetry, namely, a chair and a boat. The fractions of these two forms are 74 and 26% respectively, if the reference approximation was obtained at the MP2/aug-cc-PVTZ level, and 81 and 19%, if the reference approximation was generated at the DFT-B3LYP/cc-pVTZ level. The agreement between the theoretical and experimental molecular intensities is characterized by Rf disagreement factors of 5.06 and 6.93%, respectively. Based on the more accurate MP2/aug-cc-PVTZ quantum chemical approximation, the energy difference between the global minimum, which corresponds to the chair conformer of TMDABH, and the local minimum of the boat on the potential energy surface (PES) was found to be 1.39 kcal/mol. Moreover, NMR, IR, and Raman spectroscopic studies were carried out. According to the joint analysis of the data obtained, the most important equilibrium parameters of the chair and boat TMDABH conformers were determined to be as follows (bond lengths in Å, angles in degrees, for boat form in square brackets, Cs symmetry): N1N5 = 1.554(2) [1.520(2)], C2C3 = 1.525(2) [1.539(2)], N1C2C3 = 105.7(14) [108.8(14)], θ = C2-C3-C4/C2-N1-N5-C4 = 37.4(6) [−16.6(6)], φ = N1-C6-N5/C2-N1-N5-C4 = 72.9(3) [73.9(3)]. Comparison of especially NN bond lengths reveals a strong dependence on the bicyclic system conformation.
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Acknowledgements
We respectfully dedicate this paper to the memory of our esteemed late colleague, Dr. Leonid S. Khaikin of Lomonosov Moscow State University, a research leader in the field of GED and its combined application with spectroscopy and quantum chemical calculations for the structural analysis. His long-term study of nitrogen-containing organic molecular structures together with his wife Olga E. Grikina strongly contributed to the development of an extended molecular structure database. His will to overcome obstacles inspired his colleagues to model oneself on him and hand on the torch of structural chemistry in the future.
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This work was supported by the Russian Foundation for Basic Research (Projects Nos. 20–03-00747 and 19–33-90274).
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The corresponding author carried out a full description of quantum chemical calculations, structural analysis, provided the discussion of the results, and formulated a conclusion. A.N. Rykov carried out a gas-phase electron diffraction experiment. I.F. Shishkov was directly involved in the description and discussion. The introduction and the section devoted to the analysis of NMR spectra were written by V.V. Kuznetsov and N.N. Makhova, who also synthesized 3,3,6-trimethyl-1,5-diazabicyclo[3.1.0]hexane. Quantum chemical calculations using the Gaussian package and structural analysis with the use of Symm/Disp/Large/Eldiff software package were carried out by O.E. Grikina and I.V Kochikov. S.S. Bukalov was responsible for the NMR, IR, and Raman spectroscopic measurements.
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Nina N. Makhova passed away during submission of this manuscript.
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Ageev, G.G., Rykov, A.N., Grikina, O.E. et al. Equilibrium Molecular Structure of 3,3,6-trimethyl-1,5-diazabicyclo[3.1.0]hexane: the joint analysis of the gas-phase electron diffraction data and quantum chemical simulations. Struct Chem 33, 113–122 (2022). https://doi.org/10.1007/s11224-021-01828-5
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DOI: https://doi.org/10.1007/s11224-021-01828-5