Electrodeposited Films of Nickel -Complexes in Alkaline Solution

Electrodeposited Films of Nickel N4-Complexes in Alkaline Solution 

The typical electrodeposition process observed with nickel derivatives was first investigated by Milczarek using a Ni(II) tetrakis(3-methoxy-4-hydroxyphenyl) porphyrin as a monomer. The resulting conductive film was used for the electro-catalytic oxidation of methanol and other simple alcohols , nitric oxide, formaldehyde , or ascorbic acid and NADH. Later, [Ni(II)-69], [Ni(II)-70] and [Ni(II)-71] were shown to provide a large benefit in the electrochemical determination of nitric oxide in aqueous solution or for the electrocatalytic 

This fundamental observation confirms the one reported by Cataldi and coworkers in the case of polyNi(II)-tetramethyldibenzo-teraaza[14]annulene formed in dichloromethane and transformed in alkaline aqueous solution. It tends to show that upon the electrochemical polymerization of the nickel complex in 

As specified above, it has also been shown that tetraaza[14]annulene 74 (5,7,12,14-tetramethyl-dibenzo-l,4,8,ll-tetraaza[14]annulene) can be electrode-posited on common conducting substrates and electrochemically treated so as to display a nickel-based catalytic deposit towards the oxidation of carbohydrates in alkaline solutions which shows strong similarities to the nickel hydroxide electrode. Similar observations were reported for Ni complex 75 although they were rather oriented towards the oxidation of hydrogen peroxide and for Ni curcumin films towards the electrocatalytic oxidation of aliphatic alcohols.  

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