Effects of organised media on the excited-state proton transfer in 2-(2′-pyridyl)benzimidazole

• DOI: 10.1039/a800369f
• Publication Date: 2002-07-26T09:13:34Z
• Authors: Madhab C. Rath; Dipak K. Palit; Tulsi Mukherjee
• Keywords: Benzimidazole; Proton NMR

Absorption and fluorescence characteristics of 2-(2′-pyridyl)benzimidazole (2-PBI) are studied in the presence α- β-cyclodextrins (CD) aqueous solution at two different pHs. Steady-state time-resolved measurements used for investigation effect organised media on excited-state proton transfer reaction 2-PBI. Semi-empirical CI calculation geometry molecule reveals that 2-PBI may be involved host–guest complex formation with α-CD β-CD configurations. NMR corroborate this, providing information about orientation inside cavity CDs. No was evident γ-CD owing to its larger dimension compared size molecule.