Tuning dual emission behavior of p-dialkylaminobenzonitriles by supramolecular interactions with cyclodextrin hosts.
作者： Mhejabeen Shaikh , Jyotirmayee Mohanty , Achikanath C. Bhasikuttan , Haridas Pal
DOI: 10.1039/B719518D
关键词:
摘要: Ground state absorption and steady-state time-resolved fluorescence measurements have been carried out to understand the host–guest interactions of p-diethylaminobenzonitrile (DEABN) p-dimethylaminobenzonitrile (DMABN) dyes with α-cyclodextrin (α-CD) β-cyclodextrin (β-CD) hosts. DEABN DMABN show both locally excited (LE) intramolecular charge transfer (ICT) emissions in solution. The LE ICT are seen get modulated presence α-CD β-CD results indicate that form 1 : 1 inclusion complexes Comparing binding constants characteristics different dye·CD systems it is inferred adopts a completely orientation on complexation than other cases systems. It indicated while all N,N-dialkyl group enters host cavity leaving CN projected into water phase, dye (smallest CD) its entering cavity. differences cavities understood be determined by requirement maximum van der Waals contact encapsulated for stability complex relative sizes substituents compared cavities. From observation present not significantly high, hydrophobic interaction mainly govern formation
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