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在乙腈介质中合成了苯并－１２－冠－４（简称Ｂ－１２－Ｃ－４）和单环己基－１２－冠－４（简称Ｃｙ－１２－Ｃ－４）的六种希土配合物：ＲＥ（ＮＯ３）３·Ｂ－１２－Ｃ－４（ＲＥ＝Ｐｒ，Ｇｄ，Ｙｂ，Ｌｕ），ＲＥ（ＮＯ３）３·Ｃｙ－１２－Ｃ－４（ＲＥ＝Ｌａ，Ｌｕ）．研究了它们的ＩＲ及１ＨＮＭＲ性质，并测定了四种单晶的结构．用ＩＮＤＯ法计算了Ｌｕ（ＮＯ３）３·Ｂ－１２－Ｃ－４，Ｌｕ（ＮＯ３）３·Ｃｙ－１２－Ｃ－４的电子结构．结果表明．Ｂ－１２－Ｃ－４与希土的配合物稳定性按Ｐｒ，Ｇｄ，Ｙｂ，Ｌｕ顺序减弱，并且Ｃｙ－１２－Ｃ－４与希土的配位能力大于Ｂ－１２－Ｃ－４．发现冠醚分子通过自身不同程度的扭曲，改变冠醚环空穴的大小，实现与不同大小的希土离子的配位作用．
Six kinds of rare earth complexes of benzo-12-crown-4 (abbreviated as B-12-C-4) and monocyclohexyl-12-crown-4 (abbreviated as Cy-12-C-4) were synthesized in acetonitrile medium RE (NO3) 3. B-12-C-4 (RE = Pr, Gd, Yb, Lu), RE (NO3) 3. Cy-12-C-4 (RE = La, Lu). Their IR and 1H NMR properties were studied and the structures of four single crystals were determined. The electronic structures of Lu (NO3) 3 · B-12-C-4 and Lu (NO3) 3 · Cy-12-C-4 were calculated by INDO method. The results show. The complex stability of B-12-C-4 with rare earth was weakened in Pr, Gd, Yb, Lu order, and the coordination ability of Cy-12-C-4 with rare earth was greater than that of B-12-C-4. It is found that the crown ether molecule changes the size of the hole of the crown ether ring by different degrees of distortion of the crown ether molecule to achieve coordination with the different size of the ion of the earth.