Formation of [3]Pseudorotaxanes from -cyclodextrin and a Series of Dicarboxylic Acids with Their Corresponding , -alkanedicarboxylate Anions

Abstract

Inclusion complexes between -cyclodextrin (-CD) and a series of dicarboxylic acids (DAn, n = 1115) were prepared by co-grinding and co-precipitation methods and the [3]pseudorotaxane structure of them was elucidated by FTIR, DTA and XRD characterizations. Inclusion complexes of -CD and , -alkanedicarboxylate anions (DAn2) were acquired by neutralizing -CD/DAn different inclusion complexes with sodium hydroxide and the structure was also proved to be a pseudorotaxane structure by 1H-NMR spectra and NOESY spectrum. Both the inclusion complexes of -CD/DAn and -CD/DAn2 adopt the [3]pseudorotaxane structure with -CD arranged in dimers threaded onto one aliphatic chain and the binding mode of 1:1 inclusion complex was excluded based on the consideration of chain conformations.