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          Institute: MPI für Polymerforschung     Collection: MPI Polymerforschung     Display Documents

ID: 28374.0, MPI für Polymerforschung / MPI Polymerforschung
1H fast MAS NMR studies of hydrogen-bonding interactions in self-assembled monolayers
Authors:Pawsey, S.; McCormick, M.; De Paul, S.; Graf, Robert; Lee, Y. S.; Reven, L.; Spiess, Hans Wolfgang
Date of Publication (YYYY-MM-DD):2003-04-09
Title of Journal:Journal of the American Chemical Society
Journal Abbrev.:J. Am. Chem. Soc.
Issue / Number:14
Start Page:4174
End Page:4184
Review Status:not specified
Audience:Not Specified
Abstract / Description:The structures formed by the adsorption of carboxyalkylphosphonic acids on metal oxides were investigated by 1H fast magic angle spinning (MAS), heteronuclear correlation (HETCOR), and 1H doublequantum (DQ) MAS solid- state NMR experiments. The diacids HO2C(CH2)nPO3H2 (n = 2, 3, 11, and 15) were adsorbed on TiO2 and two types of ZrO2 powders having average particle sizes of 20, 30, and 5 nm, respectively. Carboxyalkylphosphonic acids bind selectively via the phosphonate group, forming monolayers; with pendant carboxylic acid groups. Whereas dipolar coupled P-OH protons are detected on TiO2, there are only isolated residual P-OH groups on ZrO2, reflecting the relative binding strengths of phosphonic acids on these two substrates. From a comparative 1H MAS NMR study with an analogous monolayer system, HO2C(CH2)7SH coated gold nanoparticles, the hydrogen-bonding network at the monolayer/air interface is found to be quite disordered, at least for SAMS deposited on nonplanar substrates. Whereas only hydrogen-bonded homodimers occur in the bulk diacids, hydrogen bonding between the carboxylic and phosphonic acid groups is present in multilayers of the diacids on the ZrO2 nanopowder.
Comment of the Author/Creator:Date: 2003, APR 9
External Publication Status:published
Document Type:Article
Affiliations:MPI für Polymerforschung
External Affiliations:McGill Univ, Dept Chem, 801 Sherbrooke St W, Montreal, PQ H3A 2K6, Canada
Identifiers:ISI:000182003500045 [ID No:1]
ISSN:0002-7863 [ID No:2]
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