Tetranuclear Copper and Mononuclear Nickel Complex of the Schiff Base of (3Z)-3-Hydrazonobutan-2-One Oxime with Different Aromatic Carbonyl Compounds: Synthesis, Single Crystal X-Ray Structure, Catecholase Activity, Phenoxazinone Synthase Activity, Catalytic Study for the Homocoupling of Benzyl Amines

Synthesis and characterisation of one trinuclear copper complex, ([Cu₃L₃O]ClO₄) (1) and one nickel complex ([Ni(L'H)₂(dmso)₂](ClO₄)₂) (2) with Schiff base ligands: (3Z)-3-((Z)-(1-(thiophen-2-yl)ethylidene)hydrazono)butan-2-one oxime (LH) and 1-(pyridin-2-yl)ethylidene)hydrazono)butan-2-one oxime (L^'H). 1 shows high catecholase activity and has also been tested as a catalyst for the synthesis of benzylimine. 2 shows phenoxazinone synthase activity.