title: New violet 3,3'-bipyridyl pigment purified from deep-sea microorganism Shewanella violacea DSS12.
abstract: We have purified a new violet pigment derived from Shewanella violacea DSS12 to determine its chemical structure. The pigment colored blue in tetrahydrofuran (THF) or chloroform and showed a broad absorption spectrum from 500 to 700 nm. X-ray diffraction analysis of single crystals showed that the chemical structure of this pigment was 5,5'-didodecylamino-4,4'-dihydroxy-3,3'-diazodiphenoquinone-(2,2'), containing the same chromophore as an indigoidine known as microbial blue pigment. The violet color of this pigment was due to hypsochromic shift (blue shift) caused by the side-by-side orientation of this pigment molecule, revealed by X-ray structural analyses of a single crystal.
authors.affiliation: Japan Agency for Marine-Earth Science and Technology, 2-15 Natsushima-cho, 237-0061, Yokosuka, Japan. hidekik@jamstec.go.jp
authors.forename: Hideki
authors.initials: H
authors.lastname: Kobayashi
authors.forename: Yuichi
authors.initials: Y
authors.lastname: Nogi
authors.forename: Koki
authors.initials: K
authors.lastname: Horikoshi
mesh_terms: D002725:Chloroform / Q000737:chemistry; D018360:Crystallography, X-Ray; D003979:Diazonium Compounds / Q000737:chemistry* / Q000302:isolation & purification*; D005663:Furans / Q000737:chemistry; D015394:Molecular Structure; D010860:Pigments, Biological / Q000737:chemistry* / Q000302:isolation & purification*; D020592:Shewanella / Q000737:chemistry*
chemical_list: C521635:5,5'-didodecylamino-4,4'-dihydroxy-3,3'-diazodiphenoquinone-(2,2'); D003979:Diazonium Compounds; D005663:Furans; D010860:Pigments, Biological; C018674:tetrahydrofuran; D002725:Chloroform