Abstract:

The complex Co(Ⅱ)L¹·H₂O(2)［L¹=N,N′-bis(o-oxy-acetate)benzylethylenediamine(1)］ was synthesized by the reactions of compound 1 and Co(Ⅱ) dichloride in the solvents of water, and Cu(Ⅱ)ClL²·2H₂O(3)［L²=N-(o-oxyacetate)benzylethylene diamine］ was prepared by o-oxy-acetatebenzaldehyde, ethylene diamine and Cu(Ⅱ) dichloride through onestep procedure in water. Complexes 2 and 3 were characterized by elemental analysis, ¹H NMR, FTIR spectroscopy and single crystal X-ray diffraction analysis. There are two independent molecules(host molecule) and two water molecules(guest molecule) in one asymmetric unit of complex 2, the Co(Ⅱ) atom exhibits a distorted trigonal prismatic column geometry. There are one molecule(host molecule) and two water molecules in each unit of complex 3, the Cu(Ⅱ) atom exhibits a distorted square cone geometry. Simultaneously, the effects of different concentration levels of complexes 2 and 3 on germination and seedling growth of soybean seeds were investigated through experiment. It can be concluded that soybean seeds could germinate at all of the four concentrations of complexes 2 and 3. But germination percentage, rate of germination and index of vigor were lower than control, which illustrated that as concentration of complexes 2 and 3 increased, germination and seedling growth of soybean seeds were blocked.

Key words: o-Oxy-acetatebenzaldehyde; Co(Ⅱ) complex; Cu(Ⅱ) complex; Crystal structure; Seed germination