关键词：crystal structure hydrazone 

摘要：Aryloxyacetic acid and its derivatives often possess many important biological activities.Some of them are used as herbicides and plant-growth regulators. In continuation of our previous work on synthesis and biological activities1,2,3, we decided to design series of compounds containing the aryloxyacetyl group and crown ether to study the variation of bioactivities and the effect of the substituents on the ability of the crown ether to bind metal ions4,5. Recently, we determined related crystal structures6,7,8 , in order to study both bioactivities and coordination behaviour. In view of these encouraging results, the structure of the title compound (Figure 1), was obtained and is reported here.Figure 1 The molecule configuration and atom-numbering schem for the title compound,showing ellipsoids at the 50% probability level.Crystals of the ritle compound, C28H32N2O7, is monoclinic, space group P2(1)/c, a = 8.808(3), b =24.579(7), c =11.984(4), α = 90.00, β = 97.248(6), γ = 90.00, Z = 4, Dx= 1. 313 Mg m-3 ,Mo K α, λ =0.71073 , = 9.5mm-1 , F(000) = 1080, T =293(2) K, R = 0.0594, wR=0.1184 for 2575reflections [I＞2 σ (Ⅰ) ] .The title compound adopts a syn-anti conformation, which enables N2-H...O6 intermolecule hydrogen bonds to be formed between centrosymmetrically related molecules. The resulting eight-membered rings join these molecules together as characteristic dimmers.

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