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以三-[1,1,1,2,2,3,3-七氟-7,7-二甲基-辛二酮-(4,6)]铕(Ⅲ)[Eu(fod)_3]在角鲨烷中的溶液作为气相色谱固定相,研究了电子效应和位阻效应对不同醚类与Eu(fod)_3络合作用的影响。我们发现饱和脂肪醚与Eu(fod)_3络合,位阻效应是主要因素。位阻越大,络合作用越弱,生成的络合物越不稳定。α-位不饱和脂肪醚及芳香醚,由于π键的共轭效应大大降低了氧原子的电子云密度,以致不易与Eu(fod)_3络合,这时电子效应是主要因素。这些结果与酮、醇和Eu(fod)_3的络合作用有所不同。
(Ⅲ) [Eu (fod) _3] with tris- [1,1,1,2,2,3,3-heptafluoro-7,7-dimethyl- octanedione- (4,6) The effects of electron and steric effects on the complexation of different ethers with Eu (fod) _3 were studied by using the solution in squalane as stationary phase of gas chromatography. We found that saturated aliphatic ethers complex with Eu (fod) _3, steric effect is the main factor. The larger the steric hindrance, the weaker the complexation is and the more unstable the complex formed. α-unsaturated fatty ethers and aromatic ethers, the electron effect is the main factor because the conjugation effect of the π bond greatly reduces the electron cloud density of the oxygen atoms, which makes it difficult to complex with Eu (fod) _3. These results differ from the complexation of ketones, alcohols and Eu (fod) 3.