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Europium(III) Coordination in a Combined Ligand System: A Luminescence Spectroscopy Study
ChemistrySelect ( IF 1.9 ) Pub Date : 2020-09-15 , DOI: 10.1002/slct.202002046 Alok Rout 1 , Patchapureddy Vinodkumar 2 , Bhavani Shankar Panigrahi 2
ChemistrySelect ( IF 1.9 ) Pub Date : 2020-09-15 , DOI: 10.1002/slct.202002046 Alok Rout 1 , Patchapureddy Vinodkumar 2 , Bhavani Shankar Panigrahi 2
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The coordination of europium(III) in a combined ligand system has been probed by luminescence spectroscopy by extracting it from nitric acid medium. The ligands used in the study are N,N,N′,N′‐tetra‐bis(2‐ethylhexyl)diglycolamide (T2EHDGA) and bis(2‐ethylhexyl)phosphoric acid (D2EHPA). Europium(III) complex with these ligands present in n‐Dodecane (n‐DD) medium and its detailed investigation by luminescence spectroscopy is emphasized in this paper. Various experimental parameters such as aqueous phase acidity, concentration of ligand and initial metal ion, radiation dose, etc. were tuned to find the luminescence behavior of Eu(III) in the extracted phase. The emission intensity of Eu(III) was extremely high in the organic phase after extraction at all nitric acid phases (0.5 M to 3 M HNO3) for T2EHDGA/n‐DD and from 0.01 M to 1 M for D2EHPA/n‐DD) as compared to that of the aqueous phase. The principal driving force for the complexation mechanism of Eu(III) at each nitric acid was ascertained by varying the concentration of D2EHPA in the solution of 0.1 M T2EHDGA/n‐DD. The decay profile of the Eu(III) complex was remarkably high (>1.2 millisecond (ms)) indicating theformation of inner‐sphere complex of Eu(III) with the ligands. The emission profile of Eu(III) was recorded in the irradiated solvent compositions and was compared with respect to unirradiated condition.
中文翻译：
配体系统中的（III）配位：发光光谱研究
combined（III）在组合配体体系中的配位作用已通过发光光谱法从硝酸介质中提取而进行了探测。研究中使用的配体是N，N，N'，N'-四-双（2-乙基己基）二甘醇酰胺（T2EHDGA）和双（2-乙基己基）磷酸（D2EHPA）。本文重点介绍了正十二烷（n-DD）介质中存在的具有这些配体的complex（III）配合物，并通过发光光谱对其进行了详细研究。调节了各种实验参数，如水相酸度，配体浓度和初始金属离子，辐射剂量等，以发现萃取相中Eu（III）的发光行为。在所有硝酸相（0.5 M至3 M HNO 3）萃取后，有机相中Eu（III）的发射强度极高）（对于T2EHDGA / n-DD）和0.01 M到1 M（对于D2EHPA / n-DD）与水相相比。通过改变0.1 M T2EHDGA / n-DD溶液中D2EHPA的浓度，可以确定Eu（III）在每个硝酸中的络合机理的主要驱动力。Eu（III）配合物的衰变曲线非常高（> 1.2毫秒（ms）），表明Eu（III）与配体形成了内球配合物。将Eu（III）的发射曲线记录在辐照的溶剂组合物中，并与未辐照条件进行比较。
更新日期：2020-09-15
中文翻译：
配体系统中的（III）配位：发光光谱研究
combined（III）在组合配体体系中的配位作用已通过发光光谱法从硝酸介质中提取而进行了探测。研究中使用的配体是N，N，N'，N'-四-双（2-乙基己基）二甘醇酰胺（T2EHDGA）和双（2-乙基己基）磷酸（D2EHPA）。本文重点介绍了正十二烷（n-DD）介质中存在的具有这些配体的complex（III）配合物，并通过发光光谱对其进行了详细研究。调节了各种实验参数，如水相酸度，配体浓度和初始金属离子，辐射剂量等，以发现萃取相中Eu（III）的发光行为。在所有硝酸相（0.5 M至3 M HNO 3）萃取后，有机相中Eu（III）的发射强度极高）（对于T2EHDGA / n-DD）和0.01 M到1 M（对于D2EHPA / n-DD）与水相相比。通过改变0.1 M T2EHDGA / n-DD溶液中D2EHPA的浓度，可以确定Eu（III）在每个硝酸中的络合机理的主要驱动力。Eu（III）配合物的衰变曲线非常高（> 1.2毫秒（ms）），表明Eu（III）与配体形成了内球配合物。将Eu（III）的发射曲线记录在辐照的溶剂组合物中，并与未辐照条件进行比较。
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