Synthesis, crystal structure and bioactivity of two novel complexes N,N′-bis(o-oxy-acetate)benzylethylenediamine with Co(n) and N-(o-oxy-acetate)benzylethylene diamine with Cu(n)

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) GIL²·2H₂O(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.