NMR characterization of phosphonic acid capped SnO2 nanoparticles

Gregory P. Holland, Ramesh Sharma, Jacob O. Agola, Samrat Amin, Virgil C. Solomon, Poonam Singh, Daniel Buttry, Jeffery Yarger

Research output: Contribution to journalArticle

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Abstract

Phosphonic acid capped SnO2 nanoparticles with diameters less than 5 nm were synthesized and characterized with multinuclear solution and solid-state magic angle spinning (MAS) NMR. Two types of phosphonic acid ligands were used to derivatize the SnO2 surface, producing (i) water soluble SnO2 nanoparticles capped with 2-carboxyethanephosphonic acid (CEPA) and (ii) insoluble SnO2 nanoparticles capped with phenylphosphonic acid (PPA). Multiple surface environments were observed with 31P solution and solid-state MAS NMR for both capping agents. The 31P resonances of derivatized SnO2 nanoparticles display isotropic chemical shifts that are more shielded compared to the native phosphonic acids. This observation is indicative of a strong interaction between the phosphonic acid group and the SnO2 surface. 1H MAS NMR spectra display a complete absence of the acidic protons of the phosphonic acid groups, strongly supporting the formation of P-O-Sn linkages. 1H → 31P cross polarization (CP) build-up behavior confirms the absence of the vast majority of phosphonic acid protons. Some of the build-up curves displayed oscillations that could be fit to extract the magnitude of the 1H-31P dipolar coupling constant. The dipolar coupling can then be used to calculate the distance between phosphorus and the close proximity protons. The results presented herein indicate primarily bi- and tridentate phosphonic acid bonding configuration at the SnO2 surface, in both CEPA and PPA capped nanoparticles.

Original languageEnglish (US)
Pages (from-to)2519-2526
Number of pages8
JournalChemistry of Materials
Volume19
Issue number10
DOIs
StatePublished - May 15 2007

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Nuclear magnetic resonance
Nanoparticles
Magic angle spinning
Acids
Protons
Phosphorous Acids
Chemical shift
Phosphorus
phosphonic acid
Polarization
Ligands
Water
phenylphosphonic acid

ASJC Scopus subject areas

  • Materials Chemistry
  • Materials Science(all)

Cite this

Holland, G. P., Sharma, R., Agola, J. O., Amin, S., Solomon, V. C., Singh, P., ... Yarger, J. (2007). NMR characterization of phosphonic acid capped SnO2 nanoparticles. Chemistry of Materials, 19(10), 2519-2526. https://doi.org/10.1021/cm062821u

NMR characterization of phosphonic acid capped SnO2 nanoparticles. / Holland, Gregory P.; Sharma, Ramesh; Agola, Jacob O.; Amin, Samrat; Solomon, Virgil C.; Singh, Poonam; Buttry, Daniel; Yarger, Jeffery.

In: Chemistry of Materials, Vol. 19, No. 10, 15.05.2007, p. 2519-2526.

Research output: Contribution to journalArticle

Holland, GP, Sharma, R, Agola, JO, Amin, S, Solomon, VC, Singh, P, Buttry, D & Yarger, J 2007, 'NMR characterization of phosphonic acid capped SnO2 nanoparticles', Chemistry of Materials, vol. 19, no. 10, pp. 2519-2526. https://doi.org/10.1021/cm062821u
Holland GP, Sharma R, Agola JO, Amin S, Solomon VC, Singh P et al. NMR characterization of phosphonic acid capped SnO2 nanoparticles. Chemistry of Materials. 2007 May 15;19(10):2519-2526. https://doi.org/10.1021/cm062821u
Holland, Gregory P. ; Sharma, Ramesh ; Agola, Jacob O. ; Amin, Samrat ; Solomon, Virgil C. ; Singh, Poonam ; Buttry, Daniel ; Yarger, Jeffery. / NMR characterization of phosphonic acid capped SnO2 nanoparticles. In: Chemistry of Materials. 2007 ; Vol. 19, No. 10. pp. 2519-2526.
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