6533b855fe1ef96bd12b077a

RESEARCH PRODUCT

An unprecedented CuII–Schiff base complex existing as two different trinuclear units with strong antiferromagnetic couplings

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Abstract A new tetradentate N 2 O 2 donor Schiff base ligand [OHC 6 H 4 CH NCH 2 CH 2 CH(CH 2 CH 3 )N CHC 6 H 4 OH =  H 2 L ] was obtained by 1:2 condensation of 1,3-diaminopentane with salicylaldehyde and has been used to synthesise an unusual copper(II) complex whose asymmetric unit presents two structurally different almost linear trinuclear units [Cu 3 (μ- L ) 2 (ClO 4 ) 2 ] [Cu 3 (μ- L ) 2 (H 2 O)(ClO 4 ) 2 ] ( 1 ). The ligand and the complex were characterised by elemental analysis, FT-IR, 1 H NMR and UV–Vis spectroscopy in addition electrochemical and single crystal X-ray diffraction studies were performed for the complex. The magnetic properties of 1 reveal the presence of strong intra-trimer ( J 1  = −202(3) cm −1 and J 2  = −233(3) cm −1 ) as well as very weak inter-trimer ( zJ ′ = −0.11(1) cm −1 ) antiferromagnetic interactions.