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Two isotype mononuclear yttrium(III) and erbium(III) complexes, {[Y(HL)(OAc) 2 (H 2 O) 2 ]. (H 2 O)∙(NO 3 )} (1) and {[Er(HL) (OAc) 2 (H 2 O) 2 ].(H 2 O)∙(NO 3 )} (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 (2) A, b = 11.718 (4) A, c = 12.497 (3) A,    α = 78.907 (3)°, b = 73.840 (3)°, γ = 72.074 (3)°, V = 1051.26 (6) A 3 , Z = 2, R 1 = 0.051 and    w R 2 = 0.112 and for complex of Er(III)a = 7.913 (1) A, b = 11.719 (2) A, c = 12.487 (2) A, α = 78.832 (1)°, α = 73.674 (1)°, γ = 72.012 (1)°, V = 1049.64 (3) A 3 , Z = 2, R 1 = 0.028, and   w R 2 = 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.

european journal of chemistry

Synthesis, physical studies and crystal structure determination of Y(III) and Er(III) complexes of 1-(pyridin-2-yl)-2-(pyridine-2-ylmethylene)hydrazine