Syntheses and Absorption Spectra of 1, 4-Bis (Donor) Substituted 5, 8-Naphthoquinone Dyes

Matsuoka, M.; Takei, Toshio; Nakamura, Isao; Kitao, Teijiro

doi:10.4011/shikizai1937.54.425

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R-electron-density Changes Accompanying the Transition1

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1983

1994

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Cited by 2 publications

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“…We obtained similar results for dyes [11][12][13]15 and 18-20 ( Figure 3). However, in the case of dyes 5 and 6the situation was quite different and the charge migrations were more complicated (Figure 31 quinonoid in character, and the second one was benzenoid in character, while the reverse was true for dye 5.…”

Section: R-electron-density Changes Accompanying the Transitionsupporting

confidence: 76%

Colour and Constitution of 1,4‐Naphthoquinonoid Dyes ‐ Modified PPP MO Calculations and Substituent Effects

Matsuoka

Takagi

Obayashi

et al. 1983

Journal of the Society of Dyers and Colourists

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Calculation of the n‐electron excitation energies of naphthoquinonoid dyes has been carried out by means of the Pariser—Parr—Pople (PPP) method using the variable, β,γ‐approximation. A good linear correlation between the observed and calculated values for the first π‐π* excitation was found for a new series of naphthoquinonoid dyes. The effect of substituents on the colour of different dyes was studied on the basis of these calculated results, i.e. HOMO—LUMO energy levels and π‐electron‐density changes accompanying the excitation. The intramolecular charge‐transfer character of the π‐π* transition was shown to be the same as occurs in some anthraquinonoid dyes.

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Section: R-electron-density Changes Accompanying the Transitionsupporting

confidence: 76%