Guest Molecules in a Layered Microporous Tin(IV) Phosphonate-Phosphate Material: Solid State NMR Studies

Vladimir I Bakhmutov; Douglas W Elliott; Aida R Contreras; Abraham Clearfield

doi:10.1021/acs.jpca.8b09144

Guest Molecules in a Layered Microporous Tin(IV) Phosphonate-Phosphate Material: Solid State NMR Studies

J Phys Chem A. 2018 Dec 27;122(51):9901-9909. doi: 10.1021/acs.jpca.8b09144. Epub 2018 Dec 12.

Authors

Vladimir I Bakhmutov¹, Douglas W Elliott¹, Aida R Contreras¹, Abraham Clearfield¹

Affiliation

¹ Department of Chemistry , Texas A&M University , P.O. Box 30012, College Station , Texas 77842-3012 , United States.

PMID: 30500193
DOI: 10.1021/acs.jpca.8b09144

Abstract

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-π interactions with pore walls. The benzene- d₆ absorption enthalpy due to Sn···π interactions has been determined as -Δ 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 -Δ H of 5.0 kcal/mol and Δ S of -11.0 e.u. It has been suggested that these parameters characterize N···H-OP hydrogen bonding as a driving force for accumulation of immobile pyridine molecules in pores of compound 1.