Molecular Structure of tert-Butylazide: A Gas-Phase Electron Diffraction and Quantum Chemical Study |
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Authors: | Annemarie MacKenzie Thomas M Klapötke György Schultz Magdolna Hargittai |
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Institution: | (1) Institute of Inorganic Chemistry, University of Munich (L.M.U.), Meiserstrasse 1, Munich, D-80333, Germany;(2) Structural Chemistry Research Group of the Hungarian Academy of Sciences, Eötvös University, Pf. 117, H-1431 Budapest, Hungary |
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Abstract: | The molecular structure of tert-butylazide has been determined by gas-phase electron diffraction and quantum chemical calculations. The HF/6-31G* and B3LYP/6-31G** calculations yielded near C
s symmetry for the tert-butyl group, anti conformation of the (C)N—N bond with respect to one of the
bonds, and an essentially free rotation around the
bond with a 0.34 kcal/mol energy difference between syn and anti conformations of the CNNN moiety, the anti being the more stable form. The electron diffraction analysis was carried out by modeling a mixture of conformational isomers, generated by rotating the terminal nitrogen of the azide group, using a computed rotational potential. The data are consistent with C
s symmetry for the tert-butyl group. The
bond, however, was found to be rotated out of the anti position, with respect to one of the
bonds, by 12.5(12)°. The electron diffraction analysis yielded the following bond lengths (r
g), bond angles, and torsional angles:
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Keywords: | Electron diffraction ab initio calculations tert-butylazide molecular structure |
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