We present a family of covalent organic frameworks that have been functionalized with oligo-(ethylene oxide) chains of varying lengths. This functionalization produced materials that exhibit amphidynamic behavior, where the side-chains possess dynamic movement and the framework itself remains rigid. The functional groups include ethoxy (OEt), monoglyme monomethyl ether (OMEG), diglyme monomethyl ether (ODEG), and triglyme monomethyl ether (OTEG) creating four distinct COFs. We studied the amphidynamic behavior of the prepared COFs via crystal modeling, PXRD, and 13C solid state NMR relaxometry. The contrasting differences in T1 relaxation times highlight the amphidynamic behavior of the functionalized COFs. The difference in length of the side-chains allowed for the determination of amphidynamic behavior with the use of 13C solid-state NMR relaxation methods.

Amphidynamic behavior in covalent organic frameworks probed via powder X-ray diffraction and 13C CP-MAS T1 relaxation experiments

2019 Spring National Meeting

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