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采用前体二胺1,3-二(3-胺基苯基)脲(1)和二醛1,3-二(2-甲酰基苯氧基)-2-丙醇(2)进行缩合作用得到[1+1]Schiff碱大环3.用~1H NMR、FT-IR、FABMS和元素分析等对大环组成进行了表征,并通过X射线单晶衍射技术解析了大环3的晶体结构.采用UV-vis光谱滴定技术对大环与系列阴离子的键合作用进行了考察,结果表明,Schiff碱大环3对AcO~-离子有明显的选择性识别作用,并用紫外-可见吸收光谱、核磁和等温量热滴定等技术分别对大环3与AcO~-阴离子的识别反应进行了考察,获得了识别反应的配位比、平衡常数(K)及Δ_rH_m、Δ_rS_m、Δ_rG_m等热力学参数信息.
The condensation of 1,3-bis (3-aminophenyl) urea (1) and dialdehyde 1,3-bis (2-formylphenoxy) -2-propanol (2) The [1 + 1] Schiff base macrocycle was obtained. The macrocyclic composition was characterized by ~ 1H NMR, FT-IR, FABMS and elemental analysis. The crystal structure of macrocyclic ring 3 was analyzed by X-ray single crystal diffraction The bonding between the macrocyclic ring and the series of anions was investigated by UV-vis spectrophotometry. The results showed that the Schiff base macrocycle 3 has obvious selectivity to AcO ~ - ions, The recognition reactions of macrocyclic ring 3 with AcO ~ - anions were investigated by NMR and isothermal calorimetry respectively. The coordination parameters, equilibrium constants (K) and thermodynamic parameters such as Δ_rH_m, Δ_rS_m and Δ_rG_m were obtained.