caa a22 4500 445328606 CHVBK 20180317142729.0 cr unu---uuuuu 170323e20110501xx s 000 0 eng 10.1007/s10953-011-9691-5 doi (NATIONALLICENCE)springer-10.1007/s10953-011-9691-5 A Study on Host-Guest Complexation of 5-Amino-2-Mercaptobenzimidazole with β -Cyclodextrin [Elektronische Daten] [R. Rajamohan, S. Kothai Nayaki, M. Swaminathan] Spectral characteristics of 5-amino-2-mercaptobenzimidazole (AMBZ) have been investigated in aqueous β-cyclodextrin (β-CDx) solutions. The absorbance and fluorescence intensity of the neutral and monocationic forms of AMBZ are enhanced due to the formation of an inclusion complex with β-CDx. The stoichiometry and binding constants of the complex were calculated using the Benesi-Hildebrand equation. Formation of an inclusion complex between AMBZ and β-CDx was also confirmed by steady state and time-resolved fluorescence spectroscopy. FT-IR spectral data and SEM images of the solid complex provide supporting evidence for complex formation. The effect of acidity on the ground and excited state equilibrium between neutral and monocationic forms of AMBZ was analyzed in aqueous and β-CDx environments. The ground and excited state acidity constants in β-CDx solutions were found to be different from those in aqueous solution. Based on these results, the structure of the 1:1 complex is proposed. Springer Science+Business Media, LLC, 2011 5-Amino-2-mercaptobenzimidazole nationallicence Cyclodextrin nationallicence Fluorescence spectroscopy nationallicence Inclusion complex nationallicence Acidity constant nationallicence Rajamohan R. Department of Chemistry, SKP Institute of Technology, 606611, Tiruvannamalai, India aut Kothai Nayaki S. Chemistry Division, FEAT, Annamalai University, 608002, Annamalainagar, India aut Swaminathan M. Department of Chemistry, Annamalai University, 608002, Annamalainagar, India aut Journal of Solution Chemistry Springer US; http://www.springer-ny.com 40/5(2011-05-01), 803-817 0095-9782 40:5<803 2011 40 10953 https://doi.org/10.1007/s10953-011-9691-5 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10953-011-9691-5 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Rajamohan R. Department of Chemistry, SKP Institute of Technology, 606611, Tiruvannamalai, India aut NATIONALLICENCE 700 1- Kothai Nayaki S. Chemistry Division, FEAT, Annamalai University, 608002, Annamalainagar, India aut NATIONALLICENCE 700 1- Swaminathan M. Department of Chemistry, Annamalai University, 608002, Annamalainagar, India aut NATIONALLICENCE 773 0- Journal of Solution Chemistry Springer US; http://www.springer-ny.com 40/5(2011-05-01), 803-817 0095-9782 40:5<803 2011 40 10953 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer