Cyclobutadiene dianion derivatives : Planar 4c,6e or three-dimensional 6c,6e aromaticity?
- The spatial magnetic properties (Through Space NMR Shieldings - TSNMRS) of two cyclobutadiene derivatives (2 and 5) and of a number of cyclobutadiene dianion derivatives (3, 4 and 6-8) have been calculated by the GIAO perturbation method employing the Nucleus-Independent Chemical Shift (NICS) concept of P. v. Ragué Schleyer, and visualized as Iso-Chemical-Shielding Surfaces (ICSS) of various size and direction. TSNMRS values can be successfully employed to quantify and visualize the (anti)aromaticity of the compounds studied and to discuss the influence of Li+ complexation to cyclobutadiene dianion (4a, 7 and 8) on planar 4c,6e or three-dimensional 6c,6e aromaticity.
Author details: | Erich KleinpeterORCiDGND, Andreas KochORCiDGND, Bagrat A. Shainyan |
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DOI: | https://doi.org/10.1016/j.theochem.2008.05.027 |
Publication type: | Article |
Language: | English |
Year of first publication: | 2008 |
Publication year: | 2008 |
Release date: | 2017/03/24 |
Source: | Journal of Molecular Structure: THEOCHEM. - 863 (2008), 1-3, S. 117 - 122 |
Organizational units: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Chemie |
Peer review: | Referiert |