The effect of structures of the derivatives of [2-(diphenylphosphorylmethoxy)phenyl]-diphenylphosphine oxide (L1) on the complexation properties toward rare-earth elements (REE) was studied. A new structural analogue of L1, isopropyl 2-(diphenylphosphorylmethoxy)benzoate (L3), was synthesized. The extraction of REE by the carboxylated podand L3 in a 1,1,7-trihydrododecafluoroheptanol—water system with the HNO3 concentration varied in a range from 1 to 6 mol L−1 was studied. The stability constants of the neodymium(iii) and erbium(iii) nitrate complexes with L3 and 1-(methoxydiphenylphosphoryl)-2-diphenylphosphoryl-4-ethylbenzene (L2) and of lutetium(iii) nitrate and chloride complexes with L2 in 1,1,7-trihydrododecafluorheptanol were determined. The properties of the membranes of the ion-selective electrodes based on L1, L2, and L3 toward REE cations were tested. The crystal structures of L3 and [NdL3(NO3)3(DMSO)2] were determined by X-ray diffraction analysis.

中文翻译：

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[2-(二苯基磷酰基甲氧基)苯基]二苯基氧化膦衍生物结构对稀土元素萃取和离子选择性的影响

研究了[2-(二苯基磷酰基甲氧基)苯基]-二苯基氧化膦(L1)衍生物的结构对稀土元素(REE)络合特性的影响。合成了 L1 的新结构类似物 2-(二苯基磷酰基甲氧基) 苯甲酸异丙酯 (L3)。研究了在 HNO3 浓度在 1 到 6 mol L-1 范围内变化的 1,1,7-三氢十二氟庚醇-水系统中，通过羧基化的 podand L3 提取 REE。硝酸钕 (iii) 和铒 (iii) 与 L3 和 1-(甲氧基二苯基磷酰基)-2-二苯基磷酰基-4-乙苯 (L2) 的配合物以及硝酸镥 (iii) 和氯化物与 L2 形成 1 的配合物的稳定性常数，测定了 1,7-三氢十二氟庚醇。基于 L1、L2、和 L3 对 REE 阳离子进行了测试。L3和[NdL3(NO3)3(DMSO)2]的晶体结构通过X射线衍射分析确定。