Time Resolved Infrared Spectroscopy: Kinetic Studies of Weakly Binding Ligands in an Iron–Iron Hydrogenase Model Compound

2012 ◽  
Vol 51 (13) ◽  
pp. 7362-7369 ◽  
Author(s):  
Sohail Muhammad ◽  
Salvador Moncho ◽  
Edward N. Brothers ◽  
Marcetta Y. Darensbourg ◽  
Donald J. Darensbourg ◽  
...  
Keyword(s):  
Infrared Spectroscopy ◽  
Model Compound ◽  
Kinetic Studies ◽  
Time Resolved ◽  
Iron Hydrogenase ◽  
Iron Iron ◽  
Time Resolved Infrared Spectroscopy

scholarly journals An iron-iron hydrogenase mimic with appended electron reservoir for efficient proton reduction in aqueous media

2016 ◽  
Vol 2 (1) ◽  
pp. e1501014 ◽  
Author(s):  
René Becker ◽  
Saeed Amirjalayer ◽  
Ping Li ◽  
Sander Woutersen ◽  
Joost N. H. Reek
Keyword(s):  
Aqueous Media ◽  
Proton Reduction ◽  
Time Resolved ◽  
Redox Active ◽  
Iron Hydrogenase ◽  
Natural Enzyme ◽  
Improved Stability ◽  
Iron Iron ◽  
Low Efficiency ◽  
Time Resolved Infrared Spectroscopy

The transition from a fossil-based economy to a hydrogen-based economy requires cheap and abundant, yet stable and efficient, hydrogen production catalysts. Nature shows the potential of iron-based catalysts such as the iron-iron hydrogenase (H2ase) enzyme, which catalyzes hydrogen evolution at rates similar to platinum with low overpotential. However, existing synthetic H2ase mimics generally suffer from low efficiency and oxygen sensitivity and generally operate in organic solvents. We report on a synthetic H2ase mimic that contains a redox-active phosphole ligand as an electron reservoir, a feature that is also crucial for the working of the natural enzyme. Using a combination of (spectro)electrochemistry and time-resolved infrared spectroscopy, we elucidate the unique redox behavior of the catalyst. We find that the electron reservoir actively partakes in the reduction of protons and that its electron-rich redox states are stabilized through ligand protonation. In dilute sulfuric acid, the catalyst has a turnover frequency of 7.0 × 104s−1at an overpotential of 0.66 V. This catalyst is tolerant to the presence of oxygen, thereby paving the way for a new generation of synthetic H2ase mimics that combine the benefits of the enzyme with synthetic versatility and improved stability.

A quantum cascade laser setup for studying irreversible photoreactions in H2O with nanosecond resolution and microlitre consumption

2020 ◽  
Vol 22 (45) ◽  
pp. 26459-26467
Author(s):  
Jessica L. Klocke ◽  
Tilman Kottke
Keyword(s):  
Infrared Spectroscopy ◽  
Quantum Cascade Laser ◽  
Time Resolved ◽  
Quantum Cascade ◽  
Time Resolved Infrared Spectroscopy ◽  
Laser Setup

Flavin photoreduction in H2O is elucidated by developing a quantum cascade laser setup for time-resolved infrared spectroscopy on irreversible reactions.

Water Transport in Proton Exchange Membranes: Insights from Time-Resolved Infrared Spectroscopy

2019 ◽  
Vol 33 (1) ◽  
pp. 1029-1033 ◽  
Author(s):  
Daniel Hallinan ◽  
Maria Grazia De Angelis ◽  
Marco Giacinti Baschetti ◽  
Giulio Sarti ◽  
Yossef A. Elabd
Keyword(s):  
Infrared Spectroscopy ◽  
Water Transport ◽  
Proton Exchange Membranes ◽  
Proton Exchange ◽  
Time Resolved ◽  
Time Resolved Infrared Spectroscopy

scholarly journals Probing the Contributions to DNA Hybridization Dynamics with Time-Resolved Infrared Spectroscopy

2021 ◽  
Vol 120 (3) ◽  
pp. 8a-9a
Author(s):  
Brennan Ashwood ◽  
Paul J. Sanstead ◽  
Qing Dai ◽  
Chuan He ◽  
Andrei Tokmakoff
Keyword(s):  
Infrared Spectroscopy ◽  
Dna Hybridization ◽  
Time Resolved ◽  
Time Resolved Infrared Spectroscopy

scholarly journals Conformational Changes Generated in GroEL during ATP Hydrolysis as Seen by Time-resolved Infrared Spectroscopy

1999 ◽  
Vol 274 (9) ◽  
pp. 5508-5513 ◽  
Author(s):  
Frithjof von Germar ◽  
Asier Galán ◽  
Oscar Llorca ◽  
Jose L. Carrascosa ◽  
Jose M. Valpuesta ◽  
...  
Keyword(s):  
Infrared Spectroscopy ◽  
Conformational Changes ◽  
Atp Hydrolysis ◽  
Time Resolved ◽  
Time Resolved Infrared Spectroscopy
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