The title complexes ½Co II 2 L 1 2 and ½Co II Co IIIðOAc)L 2 2 have been synthesized in excellent yields by reacting Co(OAc) 2 Á4H 2 O with H 2 L 1 and H 2 L 2 , respectively, in acetonitrile solution. Here, [L 1 ] 2-and [L 2 ] 2-are the deprotonated forms of N,N-bis(2-hydroxybenzyl)-N 0 ,N 0 -dimethylethylenediamine and N,N-bis(2-hydroxybenzyl)-2-picolylamine, respectively. The crystal structures of ½Co II 2 L 1 2 and ½Co II Co III ðOAc)L 2 2 ÁH 2 OÁCH 2 Cl 2 were determined by x-ray crystallography. In ½Co II 2 L 1 2 , each cobalt atom has distorted trigonal bipyramid geometry, while in ½Co II Co III ðOAc)L 2 2 , each cobalt atom has distorted octahedral geometry. Variable temperature magnetic moment measurements show weak antiferromagnetic interaction in ½Co II 2 L 1 2 . The magnetic characterization for ½Co II Co III ðOAc)L 2 2 is in agreement with the presence of Co(II) and Co(III) centers.