Next Article in Journal
Interfacial Compatibilization into PLA/Mg Composites for Improved In Vitro Bioactivity and Stem Cell Adhesion
Next Article in Special Issue
Study on Nuclear Magnetic Resonance Logging T2 Spectrum Shape Correction of Sandstone Reservoirs in Oil-Based Mud Wells
Previous Article in Journal
Modulation of the NOTCH1 Pathway by LUNATIC FRINGE Is Dominant over That of MANIC or RADICAL FRINGE
Previous Article in Special Issue
Gadolinium-Based Paramagnetic Relaxation Enhancement Agent Enhances Sensitivity for NUS Multidimensional NMR-Based Metabolomics
Article

1H NMR Study of the HCa2Nb3O10 Photocatalyst with Different Hydration Levels

1
Faculty of Physics, Saint Petersburg State University, 7/9 Universitetskaya nab., 199034 Saint Petersburg, Russia
2
Institute of Chemistry, Saint Petersburg State University, 7/9 Universitetskaya nab., 199034 Saint Petersburg, Russia
3
CELLS-ALBA Synchrotron, 08290 Cerdanyola del Vallès, Barcelona, Spain
*
Author to whom correspondence should be addressed.
Academic Editor: Elena G. Bagryanskaya
Molecules 2021, 26(19), 5943; https://doi.org/10.3390/molecules26195943
Received: 30 August 2021 / Revised: 14 September 2021 / Accepted: 28 September 2021 / Published: 30 September 2021
(This article belongs to the Special Issue Practical Applications of NMR to Solve Real-World Problems)
The photocatalytic activity of layered perovskite-like oxides in water splitting reaction is dependent on the hydration level and species located in the interlayer slab: simple or complex cations as well as hydrogen-bonded or non-hydrogen-bonded H2O. To study proton localization and dynamics in the HCa2Nb3O10·yH2O photocatalyst with different hydration levels (hydrated—α-form, dehydrated—γ-form, and intermediate—β-form), complementary Nuclear Magnetic Resonance (NMR) techniques were applied. 1H Magic Angle Spinning NMR evidences the presence of different proton containing species in the interlayer slab depending on the hydration level. For α-form, HCa2Nb3O10·1.6H2O, 1H MAS NMR spectra reveal H3O+. Its molecular motion parameters were determined from 1H spin-lattice relaxation time in the rotating frame (T) using the Kohlrausch-Williams-Watts (KWW) correlation function with stretching exponent β = 0.28: Ea=0.2102 eV, τ0=9.01 × 1012 s. For the β-form, HCa2Nb3O10·0.8H2O, the only 1H NMR line is the result of an exchange between lattice and non-hydrogen-bonded water protons. T(1/T) indicates the presence of two characteristic points (224 and 176 K), at which proton dynamics change. The γ-form, HCa2Nb3O10·0.1H2O, contains bulk water and interlayer H+ in regular sites. 1H NMR spectra suggest two inequivalent cation positions. The parameters of the proton motion, found within the KWW model, are as follows: Ea=0.2178 eV, τ0=8.29 × 1010 s. View Full-Text
Keywords: layered perovskite-like niobate; Dion-Jacobson phase; proton NMR layered perovskite-like niobate; Dion-Jacobson phase; proton NMR
Show Figures

Figure 1

MDPI and ACS Style

Shelyapina, M.G.; Silyukov, O.I.; Andronova, E.A.; Nefedov, D.Y.; Antonenko, A.O.; Missyul, A.; Kurnosenko, S.A.; Zvereva, I.A. 1H NMR Study of the HCa2Nb3O10 Photocatalyst with Different Hydration Levels. Molecules 2021, 26, 5943. https://doi.org/10.3390/molecules26195943

AMA Style

Shelyapina MG, Silyukov OI, Andronova EA, Nefedov DY, Antonenko AO, Missyul A, Kurnosenko SA, Zvereva IA. 1H NMR Study of the HCa2Nb3O10 Photocatalyst with Different Hydration Levels. Molecules. 2021; 26(19):5943. https://doi.org/10.3390/molecules26195943

Chicago/Turabian Style

Shelyapina, Marina G., Oleg I. Silyukov, Elizaveta A. Andronova, Denis Y. Nefedov, Anastasiia O. Antonenko, Alexander Missyul, Sergei A. Kurnosenko, and Irina A. Zvereva. 2021. "1H NMR Study of the HCa2Nb3O10 Photocatalyst with Different Hydration Levels" Molecules 26, no. 19: 5943. https://doi.org/10.3390/molecules26195943

Find Other Styles
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop