17829-83-3Relevant articles and documents
Ready Access to Anhydrous Anionic Lanthanide Acetates by Using Imidazolium Acetate Ionic Liquids as the Reaction Medium
Bousrez, Guillaume,Renier, Olivier,Kelley, Steven P.,Adranno, Brando,Tahavori, Elnaz,Titi, Hatem M.,Smetana, Volodymyr,Tang, Si-Fu,Mudring, Anja-Verena,Rogers, Robin D.
, p. 13181 - 13189 (2021/08/16)
Access to lanthanide acetate coordination compounds is challenged by the tendency of lanthanides to coordinate water and the plethora of acetate coordination modes. A straightforward, reproducible synthetic procedure by treating lanthanide chloride hydrates with defined ratios of the ionic liquid (IL) 1-ethyl-3-methylimidazolium acetate ([C2mim][OAc]) has been developed. This reaction pathway leads to two isostructural crystalline anhydrous coordination complexes, the polymeric [C2mim]n[{Ln2(OAc)7}n] and the dimeric [C2mim]2[Ln2(OAc)8], based on the ion size and the ratio of IL used. A reaction with an IL : Ln-salt ratio of 5 : 1, where Ln=Nd, Sm, and Gd, led exclusively to the polymer, whilst for the heaviest lanthanides (Dy?Lu) the dimer was observed. Reaction with Eu and Tb resulted in a mixture of both polymeric and dimeric forms. When the amount of IL and/or the size of the cation was increased, the reaction led to only the dimeric compound for all the lanthanide series. Crystallographic analyses of the resulting salts revealed three different types of metal-acetate coordination modes where η2μκ2 is the most represented in both structure types.
Synthesis and spectroscopic properties of praseodymium(III) acetate hydrate
Hehlen, Markus P.,Riesen, Hans,Güdel, Hans U.
, p. 2273 - 2277 (2008/10/08)
A new synthesis for the quasi-one-dimensional compound Pr(CH3COO)3·H2O and its deuterated analogue Pr(CD3COO)3·D2O is reported. Well-resolved absorption, luminescence, and Raman measurements on single crystals of these compounds as well as the diluted system Ce(CH3COO)3·H2O:1% Pr3+ down to 5 K are reported and analyzed. Due to high-energy O-H stretching vibrations of the directly coordinated water molecule, excited states are efficiently depopulated by nonradiative multiphonon relaxation. In the concentrated crystal, the relaxation rate of the 3P0 excited state at 5 K is ～2 × 108 s-1 and > 109 s-1 for the deuterated and nondeuterated compound, respectively. In addition, cross relaxation contributes to the nonradiative depopulation of the 1D2 excited state. It is thus likely that energy migration along the chain is not important. The 3H4 → 3P0 absorption has a relatively intense sideband, 65% and 20% of the total intensity for Pr(CH3COO)3·H2O and Ce(CH3COO)3·H2O:1% Pr3+, respectively. Double excitations involving nearest neighbors in the chain contribute two-thirds of the sideband intensity of the undiluted compound, one-third being vibronic.
