Novel ruthenium based electrocatalyst for the convenient reduction of nitrogen-nitrogen bonds in azide to ammonia in aqueous solution |
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Authors: | Gadde Ramachandraiah |
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Institution: | (1) Reactive Polymers, Central Salt and Marine Chemicals Research Institute, Gijubhai Badheka Marg, 364002 Bhavnagar, India |
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Abstract: | The interaction of azide (N
3
−
) ion, at pH 5.3 with RuIII(EDTA) (H2O)]− (EDTA = ethylenediaminetetraacetate) was studied in aqueous solution by polarography and cyclic voltammetry. The product,
RuIII(EDTA)(N3)]2− showed a multi-electron reduction step, which is polarographically reversible but, cyclic voltammetrically irreversible,
in the potential range − 0.1 to − 0.2 V vs SCE. This reduction step, which was different from the one-electron reduction step
of RuIII(EDTA)(H2O)]; (E1/2 = −0.113V vs SCE) was assigned to the reduction of the coordinated azide ion to ammonia by the irreversible transfer of electrons
from Hg-electrode via ruthenium metal. Azide, at pH 5.3, was reduced, electrolytically, for the first time, to ammonia at
Hg-pool cathode mediated by RuIII(EDTA) (N3)]2−. The turnover number with respect to the formation of ammonia (moles of ammonia per mole of ruthenium per hour) was obtained
from the constant potential electrolysis data. On the basis of experimental observations, a probable mechanism has been proposed
for the electrocatalytic reduction of azide to ammonia in aqueous solution. |
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Keywords: | Azide ion coordination reduction ammonia electrocatalysis |
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