| Titre : |
Golden organic crystals of an azobenzene derivative containing two ester bonds |
| Type de document : |
texte imprimé |
| Auteurs : |
Yukishige Kondo, Auteur ; Kazuya Nakajima, Auteur ; Masakatsu Kato, Auteur ; Hidetaka Ohrui, Auteur ; Yutaka Takahashi, Auteur |
| Année de publication : |
2015 |
| Article en page(s) : |
p. 255-258 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Catégories : |
Benzène -- Dérivés
Cristaux
Esters
Pigments -- Synthèse
Pigments organiques
|
| Index. décimale : |
667.2 Colorants et pigments |
| Résumé : |
Recently we found while we were synthesising a cationic surfactant that a synthetic intermediate, 4,4?-bis{1-[2-(N,N-dimethylamino)]ethoxy}azobenzene, produced gold-coloured crystals [Matsumoto et al., J. Oleo Sci., 59, (2010) 151]. Here we describe how an azobenzene derivative, bis[4-(ethoxycarbonylmethoxy)phenyl]diazene, also forms gold-coloured crystals after recrystallisation from a mixture of acetone and water. The profile of the specular reflectance as a function of wavelength for the crystals is very similar to that for metallic gold plate, indicating that the crystals have a golden colour. The maximum specular reflectance of the crystals is 16%. Atomic force microscopy observation shows that the crystals have flat surfaces. X-ray diffraction measurements demonstrate the presence of a periodic structure in the crystals, which indicates that monolayers (lamellar structure) consisting of azobenzene molecules with a thickness of 1.42 nm are stacked in the crystals. The gold-coloured crystals are tolerant of ultraviolet light irradiation. The gold-coloured crystals may be useful as a substitute for conventional metallic pigments in specific coating applications. |
| Note de contenu : |
- EXPERIMENTAL : Materials - Measurements - Synthesis of EtOCO-azo 1 - Preparation of gold-coloured crystals - Ultraviolet light irradiation
- RESULTS AND DISCUSSION : Synthesis of 1 and preparation of gold-coloured crystals - Surface analysis of crystalline 1 - Probable crystal structure of 1 - Tolerance to ultraviolet light |
| DOI : |
10.1111/cote.12151 |
| En ligne : |
https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12151 |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24128 |
in COLORATION TECHNOLOGY > Vol. 131, N° 3 (06/2015) . - p. 255-258
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