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َAbdolraouf Samadi-Maybodi

Academic rank: Professor
ORCID:
Education: PhD.
ScopusId:
Faculty: Faculty of Chemistry
Address:
Phone: 011-35302396

Research

Title
Investigation of molecular motion of Cl-adamantane in the nanoprous zeolite by 13C NMR dipolar dephasing and variable contact time measurements
Type
JournalPaper
Keywords
CPMAS NMR; Dipolar dephasing; Impregnation; Molecular motion; Nanoprous; Zeolite-Y; 1- Chlroadamantane.
Year
2016
Journal international journal of nano dimension
DOI
Researchers َAbdolraouf Samadi-Maybodi

Abstract

Dipolar-dephasing method provides some information about the strength of dipolar coupling in solids. Dipolar dephasing technique measures the time for a polarized carbon nucleus to lose its magnetization once the proton locking field is terminated. The dynamics of guest molecules adsorbed within the cavities and channels of nanoprous zeolite strongly depend on the structure and chemical composition of the nonporous zeolite. In this work solid-state 13C NMR spectroscopy and dipolar dephasing technique were used to determine the extent of motion 1-chlroadamantane loaded in nanoprous zeolite-Y. Loading of 1-chlroadamantane into the supercages of the zeolite-Y (with R=100 and R=2.35, R=Si/Al) was carried out by a vapor phase impregnation and solution impregnation methods. The accuracy of dipolar dephasing method was first investigated with the aid of pure 1-chlroadamantane to determine the degree of motion in the nanoprous of zeolite-Y. Results indicated that the C signal of the 1-chlroadamantane in the nonporous zeolite-Y decays faster than that the C and C, demonstrating that dipolar interaction for this carbon (C) is stronger. However, the rate o