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合成了一系列具有高位阻特征的叔丁基膦酸单烷基酯t-C_4H_9P(O)(OR)OH(R分别为n-C_8H_(17),—CH_2CH(C_2H_5)C_4H_9,—CH(CH_3)C_6H_(13),—CH_3CH_2CH(CH_3)CH_2C(CH_3)_3和n-C_(12)H_(25))。初步探讨了它们的结构与萃取重稀土元素Yb(Ⅲ)和Lu(Ⅲ)性能的关系。萃取能力随着酯烷基空间位阻的增大而显著降低。在ph_(1/2)值与酯烷基的Charton空间参数v间存在着近似的直线关系。叔丁基膦酸单烷基酯对Yb、Lu的反萃性能优于2-乙基己基膦酸单2-乙基己酯(P-507)。
A series of t-butylphosphonic acid monoalkyl esters with high steric hindrances were synthesized, including t-C_4H_9P (O) (OR) OH (R are n-C_8H_17, -CH_2CH_C_2H_5, C_4H_9, ) C_6H_ (13), -CH_3CH_2CH (CH_3) CH_2C (CH_3) _3 and n_C_ (12) H_ (25)). The relationship between their structure and extraction of heavy rare earth elements Yb (Ⅲ) and Lu (Ⅲ) was discussed. The extraction ability decreases significantly with increasing steric hindrance of ester alkyl groups. There is an approximate linear relationship between the ph_ (1/2) value and the Charton spatial parameter v of the ester alkyl group. The stripping performance of Yb, Lu from tert-butylphosphonic acid monoalkyl ester is better than that of 2-ethylhexylphosphonic acid mono-2-ethylhexyl ester (P-507).