Binuclear complexes of lanthanide pivalates with triethanolamine demonstrate a step-wise ligand loss and switching of photoluminescence propertiesстатья
Статья опубликована в высокорейтинговом журнале
Информация о цитировании статьи получена из
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 1 октября 2025 г.
Аннотация:New mixed-ligand binuclear complexes [Ln2(TeaH2)(TeaH3)(Piv)5]∙H2O∙CH3CN (Eu∙CH3CN∙H2O) and [Ln2(TeaH2)2(Piv)4] (Gd, Tb) were synthesized by direct reaction of lanthanide pivalates (Piv–, 2,2-dimethylpropanoate) with triethanolamine (TeaH3) and characterized by single crystal and powder XRD, FTIR, TGA and luminescence spectroscopy. Triethanolamine appears as chelating-bridging anionic (TeaH2–) and as chelating neutral (TeaH3) ligand. Two types of mixed-metal solid solutions [(Eu1-xTbx)2(TeaH2)(TeaH3)(Piv)5]∙H2O∙CH3CN (x=0.02) and [(Eu1-xTbx)2(TeaH2)2(Piv)4] (x=0.19-0.95) form depending on the Eu/Tb ratio. The TGA and VT-PXRD reveal a loss of ethyl pivalate fragment upon heating at 200°C. Transformation of binuclear [(Eu1-xTbx)2(TeaH2)2(Piv)4] into intermediate [(Eu1-xTbx)2(TeaH2)(Piv)3(TeaH2-C2H5)]n at 200°C leads to ‘switching off’ of Tb-centered photoluminescence, sharp increase of LIR and relative temperature sensitivity Sr as high as 722%/°C for x = 0.68.