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Crystal structure indigos

A Pariser-Parr-Pople (PPP) calculation indicates that the long-wavelength absorption band is what would be expected for the trans-s-cis-s-cis configuration shown by crystal-structure analyses to occur in the indigo crystal [2],... [Pg.42]

Figure 20-8 shows the crystal structure of a thiazine indigo compared to a diketo-pyrrolopyrrole with very similar molecular size, shape and particularly intermolecu-lar hydrogen bondings, which are mainly responsible for their pigmentary character such as insolubility, heat stability and exposure durability. [Pg.321]

Recently, the leuco-peracetate (54) of thelephoric acid has been isolated from sporophores of Boletopsis leucomelaena (386). The leuco-permethyl ether (67) of thelephoric acid occurs in minute amounts in the indigo blue coloured mycelial mats of Pulcherricium caeruleum ( = Corticium caeruleum) and its structure has been established by an X-ray crystal analysis (581, 711). The chemical nature of the blue pigment from this organism is a matter of dispute. Briggs et al. (135) obtained blue solutions (A, ax = extraction of the mycelium... [Pg.31]

See other pages where Crystal structure indigos is mentioned: [Pg.75]    [Pg.162]    [Pg.497]    [Pg.498]    [Pg.162]    [Pg.234]    [Pg.463]    [Pg.464]    [Pg.297]    [Pg.106]    [Pg.481]    [Pg.498]    [Pg.498]    [Pg.471]    [Pg.84]    [Pg.39]    [Pg.464]    [Pg.464]    [Pg.403]    [Pg.87]   


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Indigo

Indigo structure

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