University of Oulu

Porous structures and adsorption phenomena in rare-earth element phosphates and bridged resorcinarene cages elucidated by combined experimental and computational ¹³P and ¹²⁹Xe NMR

Saved in:
Author: Khalili, Roya1,2
Organizations: 1University of Oulu Graduate School
2University of Oulu, Faculty of Science, Physics, NMR Research Unit (NMR)
Format: ebook
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 1.1 MB)
Persistent link: http://urn.fi/urn:isbn:9789526235547
Language: English
Published: Oulu : University of Oulu, 2022
Publish Date: 2023-01-03
Thesis type: Doctoral Dissertation
Defence Note: Academic dissertation to be presented, with the assent of the Doctoral Training Committee of Technology and Natural Sciences of the University of Oulu, for public discussion in Auditorium L2, Linnanmaa, on 9 December 2022, at 12 noon
Reviewer: Doctor Gaspard Huber
Doctor Igor Moudrakovski
Opponent: Doctor Elina Sievänen
Description:

Abstract

The aim of the present thesis is to unravel the structure and adsorption properties of essential materials that have a broad range of applications from environmental science to technology. Studied materials are rare-earth element phosphates and resorcinarene cages. Using NMR spectroscopic techniques, we probed the structures and micro/nano scale pores of these materials. DFT computational methods were applied to interpret experimental results, as well as to provide molecular-level understanding of the investigated systems.

Firstly, we determined the configuration of water molecules in rare earth element phosphates and characterized the surface and pore structures of the samples. Rare-earth element phosphate samples included lanthanum, samarium, lutetium and ytterbium phosphates. Here, for the first time we studied rare-earth element phosphates applying ¹²⁹Xe NMR, a technique which is highly sensitive to the chemical environment and which can provide detailed information on the structures of porous materials. ¹²⁹Xe NMR analysis was complemented by ¹³P solid-state NMR to provide additional information on the local structures and the coordination of water molecules on surfaces. Complementary information from quantum chemical calculations enabled the identification of several surface structures and confirmed the experimentally observed bulk phases. Additional structural characterization of these materials was obtained by PXRD, TGA, LDS, FTIR and FESEM methods.

Secondly, we investigated supramolecular cage molecules based on bridged resorcinarene macrocycles, which are new, promising and affordable potential cages for ¹²⁹Xe NMR biosensor applications. Computational modelling predicted unique chemical shifts of ¹²⁹Xe in the cages, and chemical exchange saturation transfer and relaxation experiments revealed fast xenon exchange dynamics, which is favorable for biosensor applications.

see all

Osajulkaisut / Original papers

Osajulkaisut eivät sisälly väitöskirjan elektroniseen versioon. / Original papers are not included in the electronic version of the dissertation.

  1. Khalili, R., Larsson, A.-C., Telkki, V.-V., Lantto, P., & Kantola, A. M. (2022). Local structures of rare earth phosphate minerals by NMR. Journal of Solid State Chemistry, 311, 123097. https://doi.org/10.1016/j.jssc.2022.123097

    Rinnakkaistallennettu versio / Self-archived version

  2. Khalili, R., Kantola, A. M., Komulainen, S., Selent, A., Selent, M., Vaara, J., Larsson, A.-C., Lantto, P., & Telkki, V.-V. (2022). 129Xe NMR analysis of pore structures and adsorption phenomena in rare-earth element phosphates. Microporous and Mesoporous Materials, 344, 112209. https://doi.org/10.1016/j.micromeso.2022.112209

    Rinnakkaistallennettu versio / Self-archived version

  3. Komulainen, S., Ferando, P. U. A. I., Mareš, J., Selent, A., Khalili, R., Cesana, P. T., Ebeling, A., Kantola, A. M., Beyeh, N. K., Rissanen, K., DeBoef, B., Lantto, P., & Telkki, V.-V. (2023). Resorcinarene cages: a new class of potential 129Xe biosensors with unique chemical shift and exchange dynamics. Manuscript submitted for publication.

see all

Series: Report series in physical sciences
ISSN: 1239-4327
ISSN-E: 2814-967X
ISSN-L: 1239-4327
ISBN: 978-952-62-3554-7
ISBN Print: 978-952-62-3553-0
Issue: 151
Type of Publication: G5 Doctoral dissertation (articles)
Field of Science: 114 Physical sciences
Subjects:
31P
DFT
NMR
Funding: I gratefully acknowledge the financial support given by the European Union’s Horizon 2020 research and innovation programme under the Marie Sklodowska Curie (grant agreement No. 713606) and the University of Oulu Scholarship Foundation The University of Oulu Graduate School (UniOGS) is acknowledged for providing travel grants.
EU Grant Number: (713606) I4FUTURE - Novel Imaging and Characterisation Methods in Bio, Medical, and Environmental Research and Technology Innovations
Copyright information: © University of Oulu, 2022. This publication is copyrighted. You may download, display and print it for your own personal use. Commercial use is prohibited.