Dynamic behavior of acetonitrile molecules adsorbed in AlPO4-5 and SAPO-5 studied by 1H and 2H NMR

Shin’ichi Ishimaru, Kazuma Gotoh, Mio Ichikawa, Ryuichi Ikeda

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8 Citations (Scopus)


We studied dynamic behavior of acetonitrile molecules adsorbed in molecular sieves AIPO4-5 and SAPO-5 by 1H and 2H solid state NMR methods and compared the result with that in bulk acetonitrile. The isotropic rotation of molecules is observed in AIPO4-5 above 200 K but they are bound to Brønsted acid sites on the wall in SAPO-5 even at room temperature. An anomalous frequency dependency of 1H NMR T1 observed in acetonitrile in SAPO-5 implies a large distribution of the environment around the molecules. This distribution of environment is attributable to the random arrangement in positions of acid sites and acetonitrile molecules. It was shown that molecules in AIPO4-5 are movable compared with those in bulk although the interaction with the pore wall seems to hinder motions.

Original languageEnglish
Pages (from-to)17-22
Number of pages6
JournalMicroporous and Mesoporous Materials
Issue number1
Publication statusPublished - Jan 15 2002
Externally publishedYes


  • Acetonitrile
  • Aluminophosphate
  • Molecular dynamics
  • Molecular sieves
  • Solid state NMR
  • Spin-lattice relaxation

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials


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