Complexation of 4-azido-2,2,6,6-tetramethylpiperidine-1-oxyl (R1) and 4- oxybenzenesulfonyl-2,2,6,6-tetramethylpiperidine-1-oxyl (R2) with β-cyclod extrin (β-CD) and [2-O-(2-hydroxypropyl)]-β-cyclodextrin(2-HP-β-C...Complexation of 4-azido-2,2,6,6-tetramethylpiperidine-1-oxyl (R1) and 4- oxybenzenesulfonyl-2,2,6,6-tetramethylpiperidine-1-oxyl (R2) with β-cyclod extrin (β-CD) and [2-O-(2-hydroxypropyl)]-β-cyclodextrin(2-HP-β-CD) in aqueous solution have been studied by electron spin resonance (ESR). The isot ropic nitrogen hyperfine coupling constants aN and the rotational correlation ti me τC of the radicals change regularly after complexing with β-CD and 2-HP- β-CD. The magnitude of change in τC is in order: R1/2-HP-β-CD >R1/β-CD; R1/β-CD >R2/β-CD, R1/2-HP-β-CD >R2/2-HP-β-CD.展开更多
文摘Complexation of 4-azido-2,2,6,6-tetramethylpiperidine-1-oxyl (R1) and 4- oxybenzenesulfonyl-2,2,6,6-tetramethylpiperidine-1-oxyl (R2) with β-cyclod extrin (β-CD) and [2-O-(2-hydroxypropyl)]-β-cyclodextrin(2-HP-β-CD) in aqueous solution have been studied by electron spin resonance (ESR). The isot ropic nitrogen hyperfine coupling constants aN and the rotational correlation ti me τC of the radicals change regularly after complexing with β-CD and 2-HP- β-CD. The magnitude of change in τC is in order: R1/2-HP-β-CD >R1/β-CD; R1/β-CD >R2/β-CD, R1/2-HP-β-CD >R2/2-HP-β-CD.
