Synthèse électrochimique de complexes Ni(O)-diazabutadiène

✍ Scribed by José Coulombeix; Franz-Peter Emmenegger

• Publisher: John Wiley and Sons
• Year: 1985
• Tongue: German
• Weight: 342 KB
• Volume: 68
• Category: Article
• ISSN: 0018-019X
• DOI: 10.1002/hlca.19850680131

✦ Synopsis

Electrochemical Synthesis of the Ni(O)‐Diazabutadiene Complexes

The electrochemical reduction of Ni salts in the presence of diazabutadiene ligands (DAB = RNCHCHNR, R = t‐Bu, o‐xylyl, p‐anisoyl, p‐tolyl) has been studied in DMF by cyclic voltammetry and rotating disc polarography. In solutions containing DAB and halide X^−^, Ni(II) can be reduced to Ni(DAB)~2~, and the features of this reduction agree with a mechanism where the second DAB replaces X^−^ in the coordination sphere of Ni only after its reduction to Ni(O). Rather concentrated (≃ 0.1M) solutions of NiBr~2~ · DME and DAB in DMF have been electrolyzed without a supporting electrolyte, making the isolation of the product Ni(DAB)~2~ particularly easy. Thus, gram quantities of Ni(DAB)~2~ can be conveniently prepared within a few hours.