caa a22 4500 445328673 CHVBK 20180317142730.0 cr unu---uuuuu 170323e20110201xx s 000 0 eng 10.1007/s10953-010-9639-1 doi (NATIONALLICENCE)springer-10.1007/s10953-010-9639-1 Effect of Solvents and pH on β -Cyclodextrin Inclusion Complexation of 2,4-Dihydroxyazobenzene and 4-Hydroxyazobenzene [Elektronische Daten] [J. Premakumari, G. Roy, A. Prabhu, G. Venkatesh, V. Subramanian, N. Rajendiran] The spectral characteristics of 2,4-dihydroxyazobenzene (DHAB, sudan orange G) and 4-hydroxyazobenzene (HAB) have been studied in various solvents, different hydrogen ion and β-cyclodextrin (β-CD) concentrations, and are compared with azobenzene (AB). The inclusion complexes of the above molecules with β-CD were analyzed by UV-vis spectrometry, flourometry, FT-IR, 1H NMR, SEM and DFT methods. The solvent study shows that only the azo form is present in DHAB and HAB molecules. The unusually large red shift observed in acidic solutions indicates both molecules exhibit azo-hydrazo tautomerization. In the β-CD solutions, the increase in fluorescence intensity and large bathochromic shift in the S1 state indicates that DHAB and HAB form 2:2 inclusion complexes, whereas AB forms a 1:1 inclusion complex. Springer Science+Business Media, LLC, 2011 2,4-Dihydroxyazobenzene nationallicence Azo-hydrazo tautomerism nationallicence β -Cyclodextrin nationallicence Inclusion complex nationallicence Premakumari J. Department of Chemistry, Scott Christian College, 629 002, Nagercoil, India aut Roy G. Department of Chemistry, Scott Christian College, 629 002, Nagercoil, India aut Prabhu A. Department of Chemistry, Annamalai University, 608 002, Annamalai Nagar, Tamilnadu, India aut Venkatesh G. Department of Chemistry, Annamalai University, 608 002, Annamalai Nagar, Tamilnadu, India aut Subramanian V. Department of Chemistry, Annamalai University, 608 002, Annamalai Nagar, Tamilnadu, India aut Rajendiran N. Department of Chemistry, Annamalai University, 608 002, Annamalai Nagar, Tamilnadu, India aut Journal of Solution Chemistry Springer US; http://www.springer-ny.com 40/2(2011-02-01), 327-347 0095-9782 40:2<327 2011 40 10953 https://doi.org/10.1007/s10953-010-9639-1 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10953-010-9639-1 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Premakumari J. Department of Chemistry, Scott Christian College, 629 002, Nagercoil, India aut NATIONALLICENCE 700 1- Roy G. Department of Chemistry, Scott Christian College, 629 002, Nagercoil, India aut NATIONALLICENCE 700 1- Prabhu A. Department of Chemistry, Annamalai University, 608 002, Annamalai Nagar, Tamilnadu, India aut NATIONALLICENCE 700 1- Venkatesh G. Department of Chemistry, Annamalai University, 608 002, Annamalai Nagar, Tamilnadu, India aut NATIONALLICENCE 700 1- Subramanian V. Department of Chemistry, Annamalai University, 608 002, Annamalai Nagar, Tamilnadu, India aut NATIONALLICENCE 700 1- Rajendiran N. Department of Chemistry, Annamalai University, 608 002, Annamalai Nagar, Tamilnadu, India aut NATIONALLICENCE 773 0- Journal of Solution Chemistry Springer US; http://www.springer-ny.com 40/2(2011-02-01), 327-347 0095-9782 40:2<327 2011 40 10953 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer