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There is little systematic understanding of pore surfaces in layered microporous metal(IV) phosphate-phosphonate materials and their interactions with guest molecules. In this paper, we show how to probe the mobility of guest molecules in such poorly crystalline systems using multinuclear solid-state NMR and relaxation time measurements. Anisotropic motions of benzene- d6 molecules absorbed on the pore walls of material Sn(O3PC6H4PO3)0.85(O3POH)0.33 (1) have been recognized as the fast in-plane C6 rotation due to metal- interactions with pore walls. The benzene- d6 absorption enthalpy due to Sn interactions has been determined as - H = 5.9 kcal/mol. Specific interactions between pyridine and the pore walls of 1 have been observed as immobile pyridine, the population of which grows strongly at low temperatures to show thermodynamic parameters - H of 5.0 kcal/mol and S of -11.0 e.u. It has been suggested that these parameters characterize NH-OP hydrogen bonding as a driving force for accumulation of immobile pyridine molecules in pores of compound 1.
author list (cited authors)
Bakhmutov, V. I., Elliott, D. W., Contreras, A. R., & Clearfield, A.