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Long CL, Zhang X, Lockard JV. Pushing the heterometal doping limit while preserving long-lived charge separation in a Ti-based MOF photocatalyst. J Chem Phys 2023; 159:194704. [PMID: 37971032 DOI: 10.1063/5.0174664] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2023] [Accepted: 10/19/2023] [Indexed: 11/19/2023] Open
Abstract
This study explores the nature, dynamics, and reactivity of the photo-induced charge separated excited state in a Fe3+-doped titanium-based metal organic framework (MOF), xFeMIL125-NH2, as a function of iron concentration. The MOF is synthesized with doping levels x = 0.5, 1 and 2 Fe node sites per octameric Ti-oxo cluster and characterized by powder x-ray diffraction, UV-vis diffuse reflectance, atomic absorption, and steady state Fe K-edge X-ray absorption spectroscopy. For each doping level, time-resolved X-ray transient absorption spectroscopy studies confirm the electron trap site role of the Fe sites in the excited state. Time scan data reveal multiexponential decay kinetics for the charge recombination processes which extend into the microsecond range for all three concentrations. A series of dye photodegradation studies, based on the oxidative decomposition of Rhodamine B, demonstrates the reactivity of the charge separated excited state and the photocatalytic capacity of these MOF materials compared to traditional heterometal-doped semiconductor photocatalysts.
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Affiliation(s)
- Conor L Long
- Department of Chemistry, Rutgers University-Newark, Newark, New Jersey 07102, USA
| | - Xiaoyi Zhang
- X-ray Sciences Division, Argonne National Laboratory, Lemont, Illinois 60439, USA
| | - Jenny V Lockard
- Department of Chemistry, Rutgers University-Newark, Newark, New Jersey 07102, USA
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Hanna L, Long CL, Zhang X, Lockard JV. Heterometal incorporation in NH2-MIL-125(Ti) and its participation in the photoinduced charge-separated excited state. Chem Commun (Camb) 2020; 56:11597-11600. [DOI: 10.1039/d0cc05339b] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
X-ray spectroscopy studies reveal the location and role of Fe3+ sites incorporated in a Ti-based MOF exhibiting photo-induced charge separation.
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Affiliation(s)
- Lauren Hanna
- Department of Chemistry
- Rutgers University-Newark
- Newark
- USA
| | - Conor L. Long
- Department of Chemistry
- Rutgers University-Newark
- Newark
- USA
| | - Xiaoyi Zhang
- Advanced Photon Source
- Argonne National Laboratory
- Lemont
- USA
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Tack P, Vekemans B, Laforce B, Rudloff-Grund J, Hernández WY, Garrevoet J, Falkenberg G, Brenker F, Van Der Voort P, Vincze L. Application toward Confocal Full-Field Microscopic X-ray Absorption Near Edge Structure Spectroscopy. Anal Chem 2017; 89:2123-2130. [PMID: 28208240 DOI: 10.1021/acs.analchem.6b04828] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Using X-ray absorption near edge structure (XANES) spectroscopy, information on the local chemical structure and oxidation state of an element of interest can be acquired. Conventionally, this information can be obtained in a spatially resolved manner by scanning a sample through a focused X-ray beam. Recently, full-field methods have been developed to obtain direct 2D chemical state information by imaging a large sample area. These methods are usually in transmission mode, thus restricting the use to thin and transmitting samples. Here, a fluorescence method is displayed using an energy-dispersive pnCCD detector, the SLcam, characterized by measurement times far superior to what is generally applicable. Additionally, this method operates in confocal mode, thus providing direct 3D spatially resolved chemical state information from a selected subvolume of a sample, without the need of rotating a sample. The method is applied to two samples: a gold-supported magnesia catalyst (Au/MgO) and a natural diamond containing Fe-rich inclusions. Both samples provide XANES spectra that can be overlapped with reference XANES spectra, allowing this method to be used for fingerprinting and linear combination analysis of known XANES reference compounds.
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Affiliation(s)
- Pieter Tack
- XMI, Department of Analytical Chemisty, Ghent University , Krijgslaan 281 S12, 9000 Ghent, Belgium
| | - Bart Vekemans
- XMI, Department of Analytical Chemisty, Ghent University , Krijgslaan 281 S12, 9000 Ghent, Belgium
| | - Brecht Laforce
- XMI, Department of Analytical Chemisty, Ghent University , Krijgslaan 281 S12, 9000 Ghent, Belgium
| | - Jennifer Rudloff-Grund
- Geoscience Institute-Mineralogy, Goethe University , Altenhöferallee 1, 60438 Frankfurt, Germany
| | - Willinton Y Hernández
- Comoc, Department of Inorganic and Physical Chemistry, Ghent University , Krijgslaan 281 S3, 9000 Ghent, Belgium
| | - Jan Garrevoet
- Deutsch Elektronen Synchrotron DESY, Photon Science , Notkestr 85, D-22603 Hamburg, Germany
| | - Gerald Falkenberg
- Deutsch Elektronen Synchrotron DESY, Photon Science , Notkestr 85, D-22603 Hamburg, Germany
| | - Frank Brenker
- Geoscience Institute-Mineralogy, Goethe University , Altenhöferallee 1, 60438 Frankfurt, Germany
| | - Pascal Van Der Voort
- Comoc, Department of Inorganic and Physical Chemistry, Ghent University , Krijgslaan 281 S3, 9000 Ghent, Belgium
| | - Laszlo Vincze
- XMI, Department of Analytical Chemisty, Ghent University , Krijgslaan 281 S12, 9000 Ghent, Belgium
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Czapla-Masztafiak J, Szlachetko J, Milne CJ, Lipiec E, Sá J, Penfold TJ, Huthwelker T, Borca C, Abela R, Kwiatek WM. Investigating DNA Radiation Damage Using X-Ray Absorption Spectroscopy. Biophys J 2016; 110:1304-11. [PMID: 27028640 PMCID: PMC4816689 DOI: 10.1016/j.bpj.2016.01.031] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2015] [Revised: 01/13/2016] [Accepted: 01/27/2016] [Indexed: 12/01/2022] Open
Abstract
The biological influence of radiation on living matter has been studied for years; however, several questions about the detailed mechanism of radiation damage formation remain largely unanswered. Among all biomolecules exposed to radiation, DNA plays an important role because any damage to its molecular structure can affect the whole cell and may lead to chromosomal rearrangements resulting in genomic instability or cell death. To identify and characterize damage induced in the DNA sugar-phosphate backbone, in this work we performed x-ray absorption spectroscopy at the P K-edge on DNA irradiated with either UVA light or protons. By combining the experimental results with theoretical calculations, we were able to establish the types and relative ratio of lesions produced by both UVA and protons around the phosphorus atoms in DNA.
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Affiliation(s)
- Joanna Czapla-Masztafiak
- Paul Scherrer Institut, Villigen, Switzerland; Institute of Nuclear Physics, Polish Academy of Sciences, Krakow, Poland.
| | - Jakub Szlachetko
- Paul Scherrer Institut, Villigen, Switzerland; Institute of Physics, Jan Kochanowski University in Kielce, Kielce, Poland
| | | | - Ewelina Lipiec
- Institute of Nuclear Physics, Polish Academy of Sciences, Krakow, Poland
| | - Jacinto Sá
- Ångström Laboratory, Department of Chemistry, Uppsala University, Uppsala, Sweden; Institute of Physical Chemistry, Polish Academy of Sciences, Warsaw, Poland
| | - Thomas J Penfold
- Department of Chemistry, Newcastle University, Newcastle upon Tyne, United Kingdom
| | | | | | | | - Wojciech M Kwiatek
- Institute of Nuclear Physics, Polish Academy of Sciences, Krakow, Poland
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