Solid state {sup 31}P NMR study of phosphonate binding sites in guanidine-functionalized, molecular imprinted silica xerogels Metadata
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Title
- Main Title Solid state {sup 31}P NMR study of phosphonate binding sites in guanidine-functionalized, molecular imprinted silica xerogels
Creator
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Author: Sasaki, Darryl Y.Creator Type: Personal
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Author: Alam, Todd M.Creator Type: Personal
Contributor
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Sponsor: United States. Department of Energy.Contributor Type: OrganizationContributor Info: US Department of Energy (United States)
Publisher
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Name: Sandia National LaboratoriesPlace of Publication: Albuquerque, New MexicoAdditional Info: Sandia National Labs., Albuquerque, NM, and Livermore, CA (United States)
Date
- Creation: 2000-01-03
Language
- English
Description
- Content Description: Phosphonate binding sites in guanidine and ammonium surface-functionalized silica xerogels were prepared via the molecular imprinting technique and characterized using solid state {sup 31}P MAS NMR. One-point, two-point, and non-specific host-guest interactions between phenylphosphonic acid (PPA) and the functionalized gels were distinguished by characteristic chemical shifts of the observed absorption peaks. Using solid state as well as solution phase NMR analyses, absorptions observed at 15.5 ppm and 6.5 ppm were identified as resulting from the 1:1 (one-point) and 2:1 (two-point) guanidine to phosphonate interactions, respectively. Similar absorptions were observed with the ammonium functionalized gels. By examining the host-guest interactions within the gels, the efficiency of the molecular imprinting procedure with regard to the functional monomer-to-template interaction could be readily assessed. Template removal followed by substrate adsorption studies conducted on the guanidine functionalized gels provided a method to evaluate the binding characteristics of the receptor sites to a phosphonate substrate. During these experiments, {sup 29}Si and {sup 31}P MAS NMR acted as diagnostic monitors to identify structural changes occurring in the gel matrix and at the receptor site from solvent mediated processes.
- Physical Description: 28 p.
Subject
- Keyword: Gels
- Keyword: Phosphonates
- Keyword: Guanidines
- STI Subject Categories: 37 Inorganic, Organic, Physical And Analytical Chemistry
- Keyword: Molecular Structure
- Keyword: Nmr Spectra
- Keyword: Chemical Bonds
- Keyword: Chemical Preparation
- Keyword: Morphological Changes
- Keyword: Silica
Source
- Other Information: Submitted to Chemistry of Materials
Collection
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Name: Office of Scientific & Technical Information Technical ReportsCode: OSTI
Institution
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Name: UNT Libraries Government Documents DepartmentCode: UNTGD
Resource Type
- Article
Format
- Text
Identifier
- Report No.: SAND2000-0018J
- Grant Number: AC04-94AL85000
- Office of Scientific & Technical Information Report Number: 750185
- Archival Resource Key: ark:/67531/metadc711145
Note
- Display Note: OSTI as DE00750185
- Display Note: Medium: P; Size: 28 pages