TY - JOUR
T1 - Reactive surface organometallic complexes observed using dynamic nuclear polarization surface enhanced NMR spectroscopy
AU - Pump, Eva
AU - Viger-Gravel, Jasmine
AU - Abou-Hamad, Edy
AU - Samantaray, Manoja
AU - Hamzaoui, Bilel
AU - Gurinov, Andrei
AU - Anjum, Dalaver H.
AU - Gajan, David
AU - Lesage, Anne
AU - Bendjeriou-Sedjerari, Anissa
AU - Emsley, Lyndon
AU - Basset, Jean-Marie
N1 - KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: This work received support from the King Abdullah University of Science and Technology (KAUST) and ERC Advanced Grant No. 320860. We thank Dr Olivier Ouari and Paul Tordo from the University of Aix-Marseille, for providing the TEKPol radical.
PY - 2017
Y1 - 2017
N2 - Dynamic Nuclear Polarization Surface Enhanced NMR Spectroscopy (DNP SENS) is an emerging technique that allows access to high-sensitivity NMR spectra from surfaces. However, DNP SENS usually requires the use of radicals as an exogenous source of polarization, which has so far limited applications for organometallic surface species to those that do not react with the radicals. Here we show that reactive surface species can be studied if they are immobilized inside porous materials with suitably small windows, and if bulky nitroxide bi-radicals (here TEKPol) are used as the polarization source and which cannot enter the pores. The method is demonstrated by obtaining significant DNP enhancements from highly reactive complelxes [(equivalent to Si-O-)W(Me)(5)] supported on MCM-41, and effects of pore size (6.0, 3.0 and 2.5 nm) on the performance are discussed.
AB - Dynamic Nuclear Polarization Surface Enhanced NMR Spectroscopy (DNP SENS) is an emerging technique that allows access to high-sensitivity NMR spectra from surfaces. However, DNP SENS usually requires the use of radicals as an exogenous source of polarization, which has so far limited applications for organometallic surface species to those that do not react with the radicals. Here we show that reactive surface species can be studied if they are immobilized inside porous materials with suitably small windows, and if bulky nitroxide bi-radicals (here TEKPol) are used as the polarization source and which cannot enter the pores. The method is demonstrated by obtaining significant DNP enhancements from highly reactive complelxes [(equivalent to Si-O-)W(Me)(5)] supported on MCM-41, and effects of pore size (6.0, 3.0 and 2.5 nm) on the performance are discussed.
UR - http://hdl.handle.net/10754/622857
UR - http://pubs.rsc.org/en/Content/ArticleLanding/2017/SC/C6SC02379G#!divAbstract
UR - http://www.scopus.com/inward/record.url?scp=85007193563&partnerID=8YFLogxK
U2 - 10.1039/c6sc02379g
DO - 10.1039/c6sc02379g
M3 - Article
C2 - 28451174
SN - 2041-6520
VL - 8
SP - 284
EP - 290
JO - Chem. Sci.
JF - Chem. Sci.
IS - 1
ER -