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Microfluidic Pneumatic Cages: A Novel Approach for In-chip Crystal Trapping, Manipulation and Controlled Chemical Treatment

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Generating and stabilizing Co(I) in a nanocage environment.

Jingmei Shen¹, Mayfair C Kung, Zhongliang Shen

¹Department of Chemical & Biological Engineering, ‡Department of Chemistry, Northwestern University , 2145 Sheridan Road, Evanston, Illinois 60208, United States.

Journal of the American Chemical Society

|March 29, 2014

Summary

A novel nanocage stabilizes a cobalt(I)-carbon monoxide species, enabling controlled oxidation to cobalt(II) and hydrogen peroxide formation. This demonstrates unique reactivity within confined nanospace.

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Area of Science:

Nanotechnology
Inorganic Chemistry
Catalysis

Background:

Core-shell nanocages offer unique environments for stabilizing reactive species.
Cobalt complexes are known for their catalytic activity and redox properties.

Purpose of the Study:

To synthesize and characterize a novel Co(I)-CO species within a functionalized nanocage.
To investigate the redox behavior and reactivity of the entrapped cobalt species.

Main Methods:

Synthesis of a core-shell nanocage with carboxylic acid and silanol groups.
Reaction with dicobalt octacarbonyl (Co2(CO)8) to form the cobalt species.
Characterization using infrared spectroscopy and magnetic susceptibility measurements.
Oxidation studies using oxygen, organoazide, and water, monitored by EPR spectroscopy.

Main Results:

Formation and stabilization of a unique Co(I)-CO species within the nanocage.
Spectroscopic and magnetic data confirmed the Co(I) oxidation state.
The Co(I) species was oxidized to EPR-active Co(II) upon exposure to O2, forming H2O2.
Oxidation also occurred with organoazide and water.
Size-selective oxidation and inability to access the cobalt species by electrode confirmed its entrapment.

Conclusions:

The core-shell nanocage effectively stabilizes a reactive Co(I)-CO species.
The confined environment facilitates controlled redox transformations, including oxidation to Co(II) and H2O2 generation.
This system presents a novel platform for studying and utilizing encapsulated catalytic metal species.