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Heterogeneous Catalysis

Heterogeneous Catalysis

Heterogeneous catalysis involves a catalyst in a different phase from the reactants. It is a process where the catalyst and the reactants are in distinct phases, typically solid and gas or liquid.Most heterogeneous catalysts are metals, metal oxides, or acids. The list includes transition metals like iron (Fe), cobalt (Co), nickel (Ni), palladium (Pd), platinum (Pt), chromium (Cr), manganese (Mn), tungsten (W), silver (Ag), and copper (Cu). These metals possess partially vacant d orbitals that...

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Photochemical Oxidative Growth of Iridium Oxide Nanoparticles on CdSe@CdS Nanorods

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Wavelength dependent photocatalytic H2 generation using iridium-Pt/Pd complexes.

Suraj Soman¹, Gurmeet Singh Bindra, Avishek Paul

¹SRC for Solar Energy Conversion, School of Chemical Sciences, Dublin City University, Dublin 9, Dublin, Ireland.

Dalton Transactions (Cambridge, England : 2003)

|September 19, 2012

Summary

Novel iridium-platinum/palladium complexes efficiently produce hydrogen. Visible light irradiation yielded higher turnover numbers than UV light, suggesting specific excited states drive efficient H(2) production.

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Area of Science:

Organometallic Chemistry
Photocatalysis
Hydrogen Production

Background:

Cyclometallated dinuclear complexes offer unique photophysical properties.
Iridium complexes are known for their catalytic activity in hydrogen evolution.
Bridging ligands like 2,2':5',2''-terpyridine (BPP) can modulate metal center interactions.

Purpose of the Study:

To synthesize and characterize novel cyclometallated iridium-platinum/palladium dinuclear complexes.
To investigate the hydrogen production capabilities of these complexes under visible and UV irradiation.
To understand the excited state dynamics influencing photocatalytic efficiency.

Main Methods:

Synthesis of dinuclear iridium-Pt/Pd complexes featuring BPP and phenylpyridine (ppy) ligands.
Photocatalytic hydrogen evolution experiments under visible (470 nm) and UV (350 nm) light.
Spectroscopic analysis to probe excited state properties and reaction mechanisms.

Main Results:

The synthesized dinuclear complexes successfully produced hydrogen under both visible and UV light.
Significantly higher turnover numbers were observed with visible light irradiation compared to UV light.
Evidence suggests an interplay between two independent excited states, with one state being more efficient for H(2) production.

Conclusions:

Novel cyclometallated iridium-Pt/Pd dinuclear complexes are effective photocatalysts for hydrogen production.
Visible light photocatalysis is more efficient, highlighting the importance of specific excited state pathways.
These findings provide insights into designing advanced photocatalytic systems for sustainable hydrogen generation.