MO LCAO calculations of the electronic spectra of the anions of 1,3-diketones with substituents at positions 1 and 3 |
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Authors: | E. Ya. Gren G. Ya. Vanag |
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Affiliation: | (1) Institute of Organic Syntheses, AS Latvian SSR, Riga |
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Abstract: | The MO LCAO method is applied in the Hückel approximation to interpret the electronic spectra of the anions of 1,3-diketones having phenyl groups or double bonds in positions 1 and/or 3, as well as 1 and 2. It is found that one or two phenyl groups or double bonds in positions 1 and/or 3 produce a bathochromic shift in the strong NV1 transition and the occurrence of a new fairly strong C6H5V1 or C=CV1 transition in the short-wave region. Simultaneous substituents in position 1 and 2 or 3 produce rather complex spectra, which are rather difficult to interpret by the simple MO LCAO method. |
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