abstract
We present a study analyzing the selectivity of host guest interactions in a series of functionalized Al-MIL-53-X metal organic frameworks with X = H, NH2, and NHCHO using acetone; ethanol, and water as probe molecules. While the amino group introduces additional hydrogen bond donor centers the NHCHO anchors function as donor and acceptor. The guests were chosen due to their ability to act solely as an acceptor in the case of acetone, whereas ethanol and water provide acceptor and donor qualities with a gradual decrease of the acceptor strength toward ethanol. The characterization of the host guest interactions includes a comprehensive solid-state NMR spectroscopic study based on a full assignment of H-1 and C-13 high-resolution spectra using CRAMPS decoupling schemes to enhance H-1 resolution combined with advanced 2D HETCOR (H-1-C-13, H-1-Al-27, and H-1-N-14) spectra at high magnetic fields. In spite of a pronounced dynamical disorder of the guests, we could identify a preferred binding of the acetone via a NH center dot center dot center dot OC hydrogen bond for the NH2 and the NHCHO anchor groups by analyzing trends in the C-13 isotropic chemical shifts. At the same time H-1-H-1 through space connectivities reveal a close vicinity of the acetone methyl groups to the benzene rings of the linkers. In contrast, for ethanol and water, the interaction with the anchor groups is too weak to compete with the thermal disorder at room temperature.
keywords
SOLID-STATE NMR; NUCLEAR-MAGNETIC-RESONANCE; DIRECT SPECTRAL OPTIMIZATION; DISTANCE MEASUREMENTS; SENSITIVITY ENHANCEMENT; DECOUPLING SEQUENCES; PROTON SPECTROSCOPY; BREATHING BEHAVIOR; CARBON-DIOXIDE; POWERFUL TOOL
subject category
Chemistry; Science & Technology - Other Topics; Materials Science
authors
Wack, J; Siegel, R; Ahnfeldt, T; Stock, N; Mafra, L; Senker, J
our authors
Luís Mafra
Principal Researcheracknowledgements
We gratefully thank the ENB Graduate School