Brownbill, Nick J, Sprick, Reiner Sebastian, Bonillo, Baltasar, Pawsey, Shane, Aussenac, Fabien, Fielding, Alistair J, Cooper, Andrew I ORCID: 0000-0003-0201-1021 and Blanc, Frederic ORCID: 0000-0001-9171-1454
(2018)
Structural Elucidation of Amorphous Photocatalytic Polymers from Dynamic Nuclear Polarization Enhanced Solid State NMR.
MACROMOLECULES, 51 (8).
pp. 3088-3096.
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Abstract
Dynamic nuclear polarization (DNP) solid-state nuclear magnetic resonance (NMR) offers a recent approach to dramatically enhance NMR signals and has enabled detailed structural information to be obtained in a series of amorphous photocatalytic copolymers of alternating pyrene and benzene monomer units, the structures of which cannot be reliably established by other spectroscopic or analytical techniques. Large 13C cross-polarization (CP) magic angle spinning (MAS) signal enhancements were obtained at high magnetic fields (9.4-14.1 T) and low temperature (110-120 K), permitting the acquisition of a 13C INADEQUATE spectrum at natural abundance and facilitating complete spectral assignments, including when small amounts of specific monomers are present. The high 13C signal-to-noise ratios obtained are harnessed to record quantitative multiple contact CP NMR data, used to determine the polymers' composition. This correlates well with the putative pyrene:benzene stoichiometry from the monomer feed ratio, enabling their structures to be understood.
Item Type: | Article |
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Depositing User: | Symplectic Admin |
Date Deposited: | 04 May 2018 08:30 |
Last Modified: | 19 Jan 2023 06:34 |
DOI: | 10.1021/acs.macromol.7b02544 |
Related URLs: | |
URI: | https://livrepository.liverpool.ac.uk/id/eprint/3020912 |