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本文用核磁共振法研究了位移试剂 Eu(fod)_3与二苯并-18-冠-6的相互作用.根据观察化学位移的数据求得了逐级平衡常数值和各纯组分的化学位移值.着重分析了 OCH_2质子 NMR 峰在[R_o]/[S_]>1.3时发生分裂现象,指出分裂原因是在 R_2S 配合物中,在 AA′位配位的几率与 BB′位配位几率不同.
In this paper, the interaction between the displacement reagent Eu (fod) _3 and dibenzo-18-crown-6 was studied by using NMR.According to the observed chemical shift data, the equilibrium constant value and the chemical shift value of each pure component It is emphatically analyzed that the proton NMR peak of OCH_2 is splitted at [R_o] / [S_]> 1.3, and the reason of splitting is pointed out that the probability of coordination at the AA ’site is different from that of the BB’ site in the R_2S complex.