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  Aqueous ligand-stabilized palladium nanoparticle catalysts for parahydrogen induced 13C hyperpolarization.

McCormick, J., Grunfeld, A. M., Ertas, Y. N., Biswas, A. N., Marsh, K. L., Wagner, S., et al. (2017). Aqueous ligand-stabilized palladium nanoparticle catalysts for parahydrogen induced 13C hyperpolarization. Analytical Chemistry, 89(13), 7190-7194. doi:10.1021/acs.analchem.7b01363.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002D-6109-D Version Permalink: http://hdl.handle.net/21.11116/0000-0001-30F7-2
Genre: Journal Article

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 Creators:
McCormick, J., Author
Grunfeld, A. M., Author
Ertas, Y. N., Author
Biswas, A. N., Author
Marsh, K. L., Author
Wagner, S,, Author
Glöggler, S.1, Author              
Bouchard, L. S., Author
Affiliations:
1Research Group of NMR Signal Enhancement, MPI for Biophysical Chemistry, Max Planck Society, ou_2396691              

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 Abstract: Parahydrogen induced polarization (PHIP) is a method for enhancing NMR sensitivity. The pairwise addition of parahydrogen in aqueous medium by heterogeneous catalysts can lead to applications in chemical and biological systems. Polarization enhancement can be transferred from 1H to 13C for longer lifetimes by use of zero field cycling. In this work, water-dispersible N-acetylcysteine- and L-cysteine-stabilized palladium nanoparticles are introduced and carbon polarizations up to two orders of magnitude higher than previous aqueous heterogeneous PHIP systems are presented. P13C values of 1.2% and 0.2% are achieved for the formation of hydroxyethyl propionate from hydroxyethyl acrylate and ethyl acetate from vinyl acetate, respectively. Both nanoparticle systems are easily synthesized in open air, and TEM indicates an average size of 2.4 ± 0.6 nm for NAC@Pd and 2.5 ± 0.8 nm for LCys@Pd nanoparticles with 40% and 25% ligand coverage determined by thermogravimetric analysis, respectively. As a step toward biological relevance, results are presented for the unprotected amino acid allylglycine upon aqueous hydrogenation of propargylglycine.

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Language(s): eng - English
 Dates: 2017-06-072017-07-05
 Publication Status: Published in print
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 Rev. Method: Peer
 Identifiers: DOI: 10.1021/acs.analchem.7b01363
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Title: Analytical Chemistry
Source Genre: Journal
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Pages: - Volume / Issue: 89 (13) Sequence Number: - Start / End Page: 7190 - 7194 Identifier: -