The Schiff base N,NЈ-bis(salicylidene)-1,5-diamino-3-oxapentane (H 2 L) and its lanthanide(III) complexes, PrL(NO 3 )(DMF)(H 2 O) (1) and Ho 2 L 2 (NO 3 ) 2 ·2H 2 O (2), were synthesized and characterized by physicochemical and spectroscopic methods. Single crystal X-ray structure analysis revealed that complex 1 is a discrete mononuclear species. The Pr III ion is nine-coordinate, forming a distorted capped square antiprismatic arrangement. Complex 2 is a centrosymmetric dinuclear neutral entity in which the Ho III ion is eight-coordinate with distorted square antiprismatic arrangement. The DNA-binding proper-

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An erbium (III) complex of a pentadentate Schiff base ligand [(NO 3 )Er(µ-L) 2 Er(NO 3 )].2H 2 O [H 2 L=bis(N-salicylidene)-3oxapentane-1,5-diamine] has been synthesised, characterised and its structure confirmed by X-ray crystallography. H 2 L and the Er(III) complex both bind to DNA via a groove binding mode, and the Er(III) complex binds to DNA more strongly than H 2 L. The complex shows strong scavenging effects for hydroxyl radicals (OH·) and superoxide radicals (O 2 −· ).

V-shaped ligand bis(2-benzimidazolylmethyl)amine containing three copper(II) ternary complexes: synthesis, structure, DNA-binding properties and antioxidant activity †