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The molecular structures of 10,10′-biacridinyl-9,9′-dione (5), 9-(10′-bromo-9′-anthryl)carbazole (9) and 9,9′-bicarbazyl (12) have been solved by X-ray crystallography. Proton and carbon-13 NMR studies of these and related compounds, show that in solution their conformations are also ‘scissor-like’. AM1 semi-empirical calculations provide a rationale for the geometries of these compounds.
G. Boyer, R. M. Claramunt, J. Elguero, M. Fathalla, C. Foces-Foces, C. Jaime and A. L. Llamas-Saiz, J. Chem. Soc., Perkin Trans. 2, 1993, 757 DOI: 10.1039/P29930000757
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