Exploring the structure of pure germanophospate glasses with different concentrations probed by magic angle spinning NMR spectroscopy

Phosphate‐based glasses such as pure germanophosphate can be achieved at moderately low temperature by means of affordable chemical substances. Nowadays, they become more stimulating because they can be easily doped with alkali, transition metal ions, and rare earth oxides to afford the anticipated...

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Bibliographic Details
Published in:Magnetic resonance in chemistry 2022-09, Vol.60 (9), p.884-892
Main Authors: Hussein, A. Wahab M. A., Rekik, Najeh, Farooq, Umer, Chebaane, Saleh, Affan, Hira, Albaid, Abdelhamid, Aslam, Affia, Alfhaid, Latifah H. K.
Format: Article
Language:English
Subjects:
Chemical equilibrium
Germanium
Germanium oxides
germanophosphate glass
Glass
Low temperature
Magnetic shielding
NMR
NMR spectroscopy
Nuclear magnetic resonance
nuclear magnetic resonance (NMR)
phosphate‐based glasses
Phosphorus
shielding
special t4ht@.31P magic angle spinning (MAS)
Spectrum analysis
Substrates
Thermal stability
Transition metals
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Summary:Phosphate‐based glasses such as pure germanophosphate can be achieved at moderately low temperature by means of affordable chemical substances. Nowadays, they become more stimulating because they can be easily doped with alkali, transition metal ions, and rare earth oxides to afford the anticipated physical and/or chemical features for nanoscience applications. Herein, we report an experimental study dealing with the structure of pure germanophosphate glass samples of GeO2 prepared with different concentrations ranging from 20 up to 70 mole%. 31P magic angle spinning (MAS) nuclear magnetic resonance (NMR) spectroscopy has been employed to characterize the co‐formed glasses by two different glass‐forming oxides. The components of the phosphate species ( Qn) in each sample were determined by analyzing the MAS NMR spectra. Interestingly, 31P MAS NMR spectrum for each sample was found to be characteristic powder patterns of the middle units Q2. Q2  unit found herein has one oxygen atom bonded towards one germanium atom (non‐bridging) and the other two oxygens are bonding towards two phosphorus atoms (bridging) of phosphate group (PO4). The results show that Q2 split into two units, Q2I and Q2II, due to different shielding of the phosphorus nucleus provided by the next nearest neighbor atoms. The chemical shift is interpreted in terms of the structure of each building unit of the phosphate group. The results obtained herein shed light on the way how to explore the revealed structure of the prepared glasses for the development of supported catalysts. Indeed, owing to their high chemical/thermal stability, the co‐formed germanophosphate glasses obtained may prove as useful substrates for potential nanocatalysts. The structure of pure germanophosphate glass samples of GeO2 prepared with different concentrations is studied. 31P magic angle spinning nuclear magnetic resonance spectroscopy has been employed to characterize the co‐formed glasses. The results show that Q2 split into two units, Q2I and Q2II, due to different shielding of the phosphorus nucleus provided by the next nearest neighbor atoms.
ISSN:0749-1581
1097-458X
DOI:10.1002/mrc.5293