Abstract
The mononuclear copper(II) complexes, [CuL 1](ClO 4) ( 1), and [CuL 2](ClO 4) ( 2) with unsymmetrical quadridentate Schiff base ligands derived from the 1:1:1 condensation of 2,4-pentanedione, pyridine-2-carboxaldehyde and 1,2-ethanediamine (HL 1) or 1,3-propanediamine (HL 2) have been prepared and characterised. Complex 2 undergoes Cu(II)/H + catalysed rearrangement to [CuL 3](ClO 4) 2 ( 3) where L 3 is a symmetrical tetradentate Schiff base involving 1,3-propanediamine and pyridine-2-carboxaldehyde. Structures of all the three compounds have been verified by single crystal X-ray analysis. The geometry around Cu(II) is square-planar in 1 and 2 whereas that in 3 is distorted octahedral with two axially coordinated perchlorate ions.
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