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1H fast MAS NMR studies of hydrogen-bonding interactions in self-assembled monolayers

MPG-Autoren
http://pubman.mpdl.mpg.de/cone/persons/resource/persons48405

McCormick,  M.
MPI for Polymer Research, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons47776

De Paul,  S.
MPI for Polymer Research, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons47957

Graf,  Robert
MPI for Polymer Research, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons48648

Reven,  L.
MPI for Polymer Research, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons48786

Spiess,  Hans Wolfgang
MPI for Polymer Research, Max Planck Society;

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Zitation

Pawsey, S., McCormick, M., De Paul, S., Graf, R., Lee, Y. S., Reven, L., et al. (2003). 1H fast MAS NMR studies of hydrogen-bonding interactions in self-assembled monolayers. Journal of the American Chemical Society, 125(14), 4174-4184.


Zitierlink: http://hdl.handle.net/11858/00-001M-0000-000F-622E-1
Zusammenfassung
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.