[NiFe] hydrogenases: how close do structural and functional mimics approach the active site?

Area of Science:

• Biochemistry
• Bioinorganic Chemistry
• Catalysis

Background:

• Hydrogen is a promising alternative fuel due to rising energy demands and oil prices.
• Hydrogenases (H2ases) are biological catalysts essential for hydrogen production, with [NiFe] H2ase being a unique enzyme.
• Bioinspired and biomimetic complexes are being explored as potential catalysts mimicking the [NiFe] H2ase active site.

Purpose of the Study:

• To review recent model complexes that mimic the [NiFe] hydrogenase active site.
• To analyze the structural and functional aspects of these biomimetic complexes.
• To assess their potential as catalysts for hydrogen-related reactions.

Main Methods:

• Literature review of recently reported model complexes.
• Analysis of structural and functional data from synthesized complexes.
• Comparison of biomimetic complexes with native [NiFe] hydrogenase.

Main Results:

• Few reported complexes exhibit catalytic activity.
• Most studies focus on proton reduction, not dihydrogen oxidation.
• Recent models show promise in mimicking [NiFe] H2ase structure or function.

Conclusions:

• Developing active and selective [NiFe] hydrogenase mimics remains a challenge.
• Further research is needed to optimize biomimetic complexes for efficient hydrogen production and oxidation.
• Understanding structure-function relationships is key to designing advanced catalysts.