Dynamics in Flexible Pillar[n]arenes Probed by Solid-State NMR.

ABSTRACT: Pillar[n]arenes are supramolecular assemblies that can perform a range of technologically important molecular separations which are enabled by their molecular flexibility. Here, we probe dynamical behavior by performing a range of variable-temperature solid-state NMR experiments on microcrystalline perethylated pillar[n]arene (n = 5, 6) and the corresponding three pillar[6]arene xylene adducts in the 100-350 K range. This was achieved either by measuring site-selective motional averaged ¹³C ¹H heteronuclear dipolar couplings and subsequently accessing order parameters or by determining ¹H and ¹³C spin-lattice relaxation times and extracting correlation times based on dipolar and/or chemical shift anisotropy relaxation mechani

SUBMITTER: Hughes AR 

PROVIDER: S-EPMC8237263 | biostudies-literature | 2021 Jun

REPOSITORIES: biostudies-literature