Two isotype mononuclear yttrium(III) and erbium(III) complexes, {[Y(HL)(OAc)2(H2O)2]. (H2O)•(NO3)} (1) and {[Er(HL) (OAc)2(H2O)2].(H2O)•(NO3)} (2), where HL is the neutral Schiff base ligand 1-(pyridin-2-yl)-2-(pyridine-2-ylmethylene)hydrazine, and OAc is the acetate anion, have been synthesized and characterized by physicochemical methods and single crystal X-ray determination. Both complexes crystallizes in the triclinic space group Pī with unit cell dimensions for complex of Y(III) a = 7.909

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... (2) Å, b = 11.718 (4) Å, c = 12.497 (3) Å, α = 78.907 (3)°,  = 73.840 (3)°, γ = 72.074 (3)°, V = 1051.26 (6) Å 3 , Z = 2, R1 = 0.051 and wR2 = 0.112 and for complex of Er(III) a = 7.913 (1) Å, b = 11.719 (2) Å, c = 12.487 (2) Å, α = 78.832 (1)°, α = 73.674 (1)°, γ = 72.012 (1)°, V = 1049.64 (3) Å 3 , Z = 2, R1 = 0.028, and wR2 = 0.062. In both complexes, the coordination polyhedra around Ln(III) atoms are best described as a distorted tricapped trigonal prism. Antioxidant activities of the ligand and its Y(III) and Er(III) complexes are studied. KEYWORDS Complex Schiff base Crystal structure NMR spectroscopy Antioxidant activity Magnetic properties Cite this: Eur.