Mono(chelato)mono(alkoxo)nickel(II) complexes of the general formula, Ni(OR)(dk) (R = Me, i-Pr and dk = acac, bazac, dbzm and tta) have been synthesized by the reactions of nickel alkoxides, Ni(OR)₂(R = Me and i-Pr) with acetylacetone (Hacac), benzoylacetone (Hbzac), dibenzoylmethane (Hdbzm) and 2-thienoyltrifluoroacetone (Htta). These derivatives interchange their alkoxy groups quantitatively with other alcohols. Molecular weight, i.r., electron spin resonance, electronic reflectance spectral and magnetic susceptibility studies have been carried out.