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  • A nickel complex of a conjugated bis-dithiocarbazate Schiff base for the photocatalytic production of hydrogen.

A nickel complex of a conjugated bis-dithiocarbazate Schiff base for the photocatalytic production of hydrogen.

Dalton transactions (Cambridge, England : 2003) (2015-07-22)
Catherine F Wise, Dan Liu, Kathryn J Mayer, Patrick M Crossland, Carolyn L Hartley, William R McNamara
ABSTRACT

We report a nickel complex containing a conjugated bis-dithiocarbazate ligand that is an active catalyst for the reduction of protons into hydrogen gas. Light-driven hydrogen generation is observed from a system containing this molecular nickel catalyst coupled with a fluorescein photosensitizer and triethylamine sacrificial donor. The photocatalytic system is stable for over 70 hours, achieving 3300 turnovers with respect to catalyst. The complex is also an active electrocatalyst for proton reduction with catalysis occurring at -1.7 V vs. Fc(+)/Fc. The nickel bis-dithiocarbazate complex represents a highly active and stable catalyst for hydrogen generation.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Hydrazine hydrate, reagent grade, N2H4 50-60 %
Sigma-Aldrich
Triethylamine, ≥99.5%
Sigma-Aldrich
Triethylamine, puriss. p.a., ≥99.5% (GC)
Sigma-Aldrich
Triethylamine, for protein sequence analysis, ampule, ≥99.5% (GC)
Sigma-Aldrich
Triethylamine, ≥99%
Sigma-Aldrich
Triethylamine, for amino acid analysis, ≥99.5% (GC)
Sigma-Aldrich
Triethylamine, BioUltra, ≥99.5% (GC)
Sigma-Aldrich
Nickel(II) acetate tetrahydrate, purum p.a., ≥99.0% (KT)
Sigma-Aldrich
Hydrazine monohydrate, N2H4 64-65 %, reagent grade, ≥97%
Sigma-Aldrich
Benzyl chloride, ReagentPlus®, 99%, contains ≤1% propylene oxide as stabilizer
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Fluorescein, for fluorescence, free acid
Sigma-Aldrich
Nickel(II) acetate tetrahydrate, 99.995% trace metals basis
Sigma-Aldrich
Nickel(II) acetate tetrahydrate, 98%
Sigma-Aldrich
Potassium hydroxide, anhydrous, ≥99.95% trace metals basis