scholarly journals Harvesting the photoexcited holes on a photocatalytic proton reduction metal–organic framework

2017 ◽  
Vol 201 ◽  
pp. 71-86 ◽  
Author(s):  
J. G. Santaclara ◽  
A. I. Olivos-Suarez ◽  
I. du Fossé ◽  
A. Houtepen ◽  
J. Hunger ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Metal Organic Framework ◽  
Porous Titanium ◽  
Light Illumination ◽  
Oxidation Reactions ◽  
Proton Reduction ◽  
Visible Light Illumination ◽  
Metal Organic ◽  
Oxygen Evolving ◽  
Organic Framework

The highly porous titanium based metal–organic framework NH2-MIL-125(Ti) has recently attracted significant attention in the field of photocatalysis as a promising material for H+ reduction. This work reveals charge transfer upon visible light illumination from this MOF to two different charge acceptors, as an alternative to sacrificial electron donors. Charge transfer is demonstrated through a combined spectroscopic study between this MOF and: (1) 2-(1H-pyrazol-3-yl)phenol, a molecule that functionally mimics the tyrosine–histidine pair, responsible for shuttling the holes to the oxygen evolving centre in natural photosynthesis, and (2) TEMPO, a well known and stable radical. Charge transfer of the holes from the MOF to these occluded molecules takes place on the picosecond time scale. This work suggests that, by coupling a stable and recyclable charge acceptor to the photogenerated holes, the charges can be utilised for oxidation reactions and, thus, link the reduction to the oxidation reactions in water splitting.

scholarly journals Probing charge transfer characteristics in a donor–acceptor metal–organic framework by Raman spectroelectrochemistry and pressure-dependence studies

2018 ◽  
Vol 20 (40) ◽  
pp. 25772-25779 ◽  
Author(s):  
Pavel M. Usov ◽  
Chanel F. Leong ◽  
Bun Chan ◽  
Mikihiro Hayashi ◽  
Hiroshi Kitagawa ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Pressure Dependence ◽  
Metal Organic Framework ◽  
Metal Organic Frameworks ◽  
Transfer Characteristics ◽  
Donor Acceptor ◽  
Metal Organic ◽  
Transfer Properties ◽  
Organic Framework

Donor–Acceptor Metal–Organic Frameworks display redox and pressure dependent charge transfer properties.

scholarly journals Nanopore-induced host–guest charge transfer phenomena in a metal–organic framework

2018 ◽  
Vol 9 (13) ◽  
pp. 3282-3289 ◽  
Author(s):  
S. Yamamoto ◽  
J. Pirillo ◽  
Y. Hijikata ◽  
Z. Zhang ◽  
K. Awaga
Keyword(s):  
Charge Transfer ◽  
Self Assembly ◽  
Metal Organic Framework ◽  
Donor And Acceptor ◽  
Organic Electron ◽  
Donor Acceptor ◽  
Metal Organic ◽  
Bulk Scale ◽  
A Charge ◽  
Organic Framework

Using the “crystal sponge” approach, weak organic electron donor molecules were impregnated and evenly distributed in a crystal of a metal–organic framework (MOF), with the self-assembly of the donor–acceptor pairs with electron acceptor ligands. The nanopores of the MOF confined them and induced a charge transfer phenomenon, which would not occur between donor and acceptor molecules in a bulk scale.

scholarly journals Enhanced Water Stability and Photoresponsivity in Metal-Organic Framework (MOF): A Potential Tool to Combat Drug-resistant Bacteria

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Saleh A. Ahmed ◽  
Damayanti Bagchi ◽  
Hanadi A. Katouah ◽  
Md. Nur Hasan ◽  
Hatem M. Altass ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Charge Transfer ◽  
Metal Organic Framework ◽  
Resistant Bacteria ◽  
Ros Generation ◽  
Water Stability ◽  
Equal Proportion ◽  
Electronic Band ◽  
Metal Organic ◽  
Organic Framework

AbstractIn this work, we have successfully synthesized a bimetallic (Zinc and Cobalt) Zeolitic Imidazolate Framework (Zn50Co50-ZIF), a class in a wider microporous Metal-Organic Framework (MOF) family. The synthesized nanostructures maintain both water stability like ZIF-8 (solely Zn containing) and charge transfer electronic band in the visible optical spectrum as ZIF-67 (solely Co containing). Crystal structure from XRD, high resolution transmission electron microscopy (HRTEM) followed by elemental mapping (EDAX) confirm structural stability and omnipresence of the metal atoms (Zn and Co) across the nanomaterial with equal proportion. Existence of charge transfer state consistent with ZIF67 and intact ultrafast excited state dynamics of the imidazolate moiety in both ZIF-8 and ZIF-67, is evidenced from steady state and time resolved optical spectroscopy. The thermal and aqueous stabilities of Zn50Co50-ZIF are found to be better than ZIF-67 but comparable to ZIF-8 as evidenced by solubility, scanning electron microscopy (SEM) and XRD studies of the material in water. We have evaluated the photoinduced ROS generation by the mixed ZIF employing dichloro-dihydro-fluorescein diacetate (DCFH-DA) assay. We have also explored the potentiality of the synthesized material for the alternate remediation of methicillin resistant Staphylococcus aureus (MRSA) infection through the photoinduced reactive oxygen species (ROS) generation and methylene blue (MB) degradation kinetics.

scholarly journals A new platform for development of photosystem I based thin films with superior photocurrent: TCNQ charge transfer salts derived from ZIF-8

2020 ◽  
Vol 2 (11) ◽  
pp. 5171-5180
Author(s):  
Tyler H. Bennett ◽  
Ravi Pamu ◽  
Guang Yang ◽  
Dibyendu Mukherjee ◽  
Bamin Khomami
Keyword(s):  
Thin Films ◽  
Charge Transfer ◽  
Photosystem I ◽  
Protein Complex ◽  
Metal Organic Framework ◽  
Charge Transfer Salts ◽  
Metal Organic ◽  
Organic Framework

The photosynthetic protein complex Photosystem I has been incorporated into the metal organic framework ZIF-8 and then reacted with TCNQ to form a conductive charge transfer salt, generating significant photocurrent from a biohybrid photoactive film.

Charge Transfer Induced Multifunctional Transitions with Sensitive Pressure Manipulation in a Metal–Organic Framework

2015 ◽  
Vol 54 (13) ◽  
pp. 6433-6438 ◽  
Author(s):  
Junye Yang ◽  
Long Zhou ◽  
Jinguang Cheng ◽  
Zhiwei Hu ◽  
Changyang Kuo ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Metal Organic Framework ◽  
Metal Organic ◽  
Sensitive Pressure ◽  
Organic Framework

Porous titanium and zirconium oxo carboxylates at the interface between sol–gel and metal–organic framework structures

2014 ◽  
Vol 43 (3) ◽  
pp. 950-957 ◽  
Author(s):  
Christian Maurer ◽  
Bettina Baumgartner ◽  
Silvia Pabisch ◽  
Johanna Akbarzadeh ◽  
Herwig Peterlik ◽  
...  
Keyword(s):  
Metal Organic Framework ◽  
Sol Gel ◽  
Porous Titanium ◽  
Metal Organic ◽  
Organic Framework
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