caa a22 4500 469059877 CHVBK 20180323132853.0 cr unu---uuuuu 170328e19920901xx s 000 0 eng 10.1007/BF01045980 doi (NATIONALLICENCE)springer-10.1007/BF01045980 Tawarah Khalid Department of Chemistry, Yarmouk University, Irbid, Jordan aut A thermodynamic study of the inclusion processes of α- and β -cyclodextrins with the acid forms of methyl orange and methyl yellow [Elektronische Daten] [Khalid Tawarah] The effect of temperature on the UV-visible spectra of the acid forms of methyl orange and methyl yellow in the presence of α- andβ-cyclodextrins was analysed in terms of 1 : 1 inclusion processes. Three inclusion processes were considered for each azo dye/cyclodextrin system. The processes are the apparent inclusion process, the ammonium inclusion process, and the azonium inclusion process. The values of ΔH 0 and ΔS 0 are reported for each process. The inclusion complexes of the ammonium tautomer are more stable than those of the azonium tautomer and α-cyclodextrin inclusion complexes are more stable than those ofβ-cyclodextrin. The inclusion processes resulted in a shift in the position of the tautomeric equilibrium of an azo dye. A significant color fading was observed in α-cyclodextrin/methyl yellow solutions. No measurable changes in the absorbances were observed in the case of azo dye solutions containing γ-cyclodextrin. Kluwer Academic Publishers, 1992 Inclusion complexes nationallicence stability constants nationallicence cyclodextrins nationallicence methyl orange nationallicence methyl yellow nationallicence Journal of inclusion phenomena and molecular recognition in chemistry Kluwer Academic Publishers 14/3-4(1992-09-01), 195-204 0923-0750 14:3-4<195 1992 14 10847 https://doi.org/10.1007/BF01045980 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF01045980 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Tawarah Khalid Department of Chemistry, Yarmouk University, Irbid, Jordan aut NATIONALLICENCE 773 0- Journal of inclusion phenomena and molecular recognition in chemistry Kluwer Academic Publishers 14/3-4(1992-09-01), 195-204 0923-0750 14:3-4<195 1992 14 10847 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer