Effects of isomerism on near infrared properties of perylene bisimide derivatives / Majid Mazhar in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 14, N° 1 (01/2017)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 14, N° 1 (01/2017) . - p. 204-217 Titre : Effects of isomerism on near infrared properties of perylene bisimide derivatives Type de document : texte imprimé Auteurs : Majid Mazhar, Auteur ; Majid Abdous, Auteur ; Kamaladin Gharanjig, Auteur ; Reza Teimuri-Mofrad, Auteur ; Mojdeh Zargaran, Auteur Année de publication : 2017 Article en page(s) : p. 204-217 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Diffractométrie de rayons X Isomérie En chimie organique, on parle d'isomérie lorsque deux molécules possèdent la même formule brute mais ont des formules développées ou stéréochimiques différentes. Ces molécules, appelées isomères, peuvent avoir des propriétés physiques, chimiques et biologiques différentes. On distingue différents types d'isomérie, notamment l'isomérie de constitution (isomérie plane) et l'isomérie de configuration (stéréoisomérie). Pérylène bisimide Pigments organiques Réflectance Index. décimale : 667.9 Revêtements et enduits Résumé : In this study, five different perylene bisimide derivatives are synthesized, four of which are structural isomers. The pigments are used to prepare corresponding paints and their ultraviolet–visible–near infrared (NIR) reflectance is investigated on two optically different substrates, namely high absorptive and high reflective substrates. These pigments are classified according to their NIR properties. They show substantial differences in NIR reflectance, transmittance, and absorbance despite their structural similarities. This indicates that the NIR properties of perylene bisimide derivatives are dependent on the nature of N-substituent and electronic environment of the molecule. This study shows that the existence of bonds with high-frequency fundamental vibrations and their counts which were introduced as affecting parameters on the NIR properties of the perylene pigments is not the main affecting factor and we should seek it elsewhere such as the crystal structure and intermolecular interactions of the pigments. Note de contenu : - EXPERIMENTAL : Materials - Synthesis procedure - Instruments - Paint preparation - RESULTS AND DISCUSSION : XRD analysis - UV-Vis-NIR reflectance DOI : 10.1007/s11998-016-9843-z En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-016-9843-z.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27802 [article]

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Investigation of substituent effect on cool activity of perylene bisimide pigments / Fahimeh Mahmoudi Meymand in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 2 (03/2019)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 2 (03/2019) . - p. 439-447 Titre : Investigation of substituent effect on cool activity of perylene bisimide pigments Type de document : texte imprimé Auteurs : Fahimeh Mahmoudi Meymand, Auteur ; Majid Mazhar, Auteur ; Majid Abdous, Auteur Année de publication : 2019 Article en page(s) : p. 439-447 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Pérylène bisimide Pigments Rayonnement infrarouge Réflectance Index. décimale : 667.9 Revêtements et enduits Résumé : In this paper, some derivatives of perylene bisimides are successfully synthesized and characterized using FTIR, HNMR and XRD techniques. In addition, their UV–Vis–NIR reflectance spectra are investigated. Synthesized pigments were planned to have high structural similarities as all of them were N,N′-diphenyl-3,4,9,10-perylenedicarboximide derivatives. The substituents are selected from two categories including activating groups and deactivating ones. The correlation between substituent electronic properties and NIR features of the synthesized pigments is investigated, while the data of three previously synthesized derivatives are included. The results have revealed interesting approximate correlation between NIR properties and electronic features of the substituents. Electronically activating groups reduce the reflectance values (on white substrate) of the pigments in comparison with nonsubstituted molecule, while deactivating ones increase the reflectance amount. This result can be a starting point for detailed studying of structure–NIR properties correlation in perylene pigments. Crystallinity (%) of the pigments is estimated using XRD patterns, and the probable correlation of this parameter with NIR properties of the pigments is investigated, and no meaningful correlation is detected. All the pigments are NIR-transparent and subsequently are capable to be used as cool pigments. Note de contenu : - EXPERIMENTAL : Materials - Instruments - General procedure for the synthesis of perylene derivatives - Paint preparation an substrate selection - RESULTS AND DISCUSSION : PBIs characterizations - UV-Vis-NIR reflectance spectra - X-ray diffraction (XRD) DOI : 10.1007/s11998-018-0122-z En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-0122-z Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32415 [article]

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