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- W2017345440 abstract "Fluorescence correlation spectroscopy (FCS) has been used to study the formation of large nanotube aggregates involving γ-cyclodextrin (γ-CD) and coumarin 153 (C153). It is observed that the length of a γ-CD:C153 nanotube aggregate is ∼770 nm. This is ∼480 times larger than the length of a 1:1 γ-CD:C480 complex (∼1.6 nm) and ∼950 times that of a γ-CD. This implies that 950 γ-CD units are noncovalently attached in the γ-CD:C153 aggregate. Binding constants (Kb) of both the dyes to γ-CD were obtained from the fluctuation in fluorescence intensity. The rate of association and dissociation are obtained from the inverse of τoff and τon, respectively. The binding constant for the 1:1 γ-CD:C480 complex is ∼1000 M–1. The burst integrated fluorescence lifetime (BIFL) histogram reveals presence of three distinct lifetime 1.8 ns (18%), 2.8 ns (69%), 3.2 ns (13%). These three lifetimes correspond to C153 present in bulk water and at the end and middle of the γ-CD:C153 nanotube aggregate, respectively. The lifetime of C480 in the 1:1 γ-CD:C480 complex is found to be 3.7 ns." @default.
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- W2017345440 date "2011-08-12" @default.
- W2017345440 modified "2023-09-23" @default.
- W2017345440 title "Study of γ-Cyclodextrin Host–Guest Complex and Nanotube Aggregate by Fluorescence Correlation Spectroscopy" @default.
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- W2017345440 doi "https://doi.org/10.1021/jp2053629" @default.
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