60864-26-8Relevant academic research and scientific papers
Spectroscopic peculiarities of CsCaI3:Tm2+ single crystals examined through one-photon and excited state excitation spectroscopy
Karbowiak, Miros?aw,Lisiecki, Rados?aw,Solarz, Piotr,Komar, Jaros?aw,Ryba-Romanowski, Witold
, p. 1165 - 1171 (2018)
The CsCaI3 single crystals doped with Tm2+ were grown by Bridgman technique. Divalent thulium luminescence related to the 4f13-4f13 intra-configurational and 4f125d1-4f13 inter-configurational transitions were analyzed as a function of temperature. Excited state excitation spectroscopy has been applied within a wide spectral range to examine peculiarities of transitions between different 4f125d1 excited states of Tm2+. This two-color excitation experiment was useful to assess d-d photon-absorption processes that are relevant to observed up-conversion phenomena attributed to effective anti-Stokes green luminescence around 550 nm. Furthermore, activation energy of 4f125d1 → 4f13 luminescence quenching was estimated and high value of 2F5/2 → 2F7/2 emission cross-section was determined in CsCaI3:Tm2+. Our spectroscopic study was performed to complement and verify the previous investigation in this field.
Synthesis and characterization of isopropylamine complexes of lanthanide(II) diiodides: Molecular structure of TmI2(PriNH2)4 and EuI2(PriNH2)4
Bochkarev, Mikhail N.,Khoroshenkov, Georgy V.,Kuzyaev, Dmitry M.,Fagin, Anatoly A.,Burin, Mikhail E.,Fukin, Georgy K.,Baranov, Eugeny V.,Maleev, Alexander A.
, p. 3315 - 3320 (2008/10/09)
It was found that the lanthanide diiodides LnI2 (1) (Ln = Nd, Sm, Eu, Dy, Tm, Yb) are dissolved in isopropylamine (IPA) without redox transformations. Stability of the formed solutions decreases in a row Eu ≈ Yb > Sm > Tm > Dy > Nd. Removing of a solvent in vacuum leaves complexes LnI2(IPA)x (2) (Nd, x = 5; Sm, Eu, Dy, Tm, Yb, x = 4) as crystalline colored solids. Stability of 2-Nd,Dy,Tm is higher than that of known THF or DME coordinated salts. Divalent state of metal in the products is confirmed by data of UV-Vis spectroscopy, magnetic measurements and their chemical behavior. Structure of 2-Eu and 2-Tm was established by X-ray diffraction analysis. Oxidation of 2-Nd,Dy in IPA affords amine-amides (PriNH)Ln(IPA)y (3) (Nd, y = 4; Dy, x = 3). n-Propylamine also dissolves the iodides 1-Sm,Eu,Dy,Tm,Yb but stability of the solutions is significantly lower. 1-Nd vigorously reacts with PrnNH2 even at -30 °C which hampers the formation of the solution.
Reduction of azobenzene by neodymium(II), dysprosium(II), and thulium(II) diiodides
Katkova, Marina A.,Fukin, Georgy K.,Fagin, Anatolii A.,Bochkarev, Mikhail N.
, p. 218 - 223 (2007/10/03)
The diiodides of divalent neodymium (1), dysprosium (2), and thulium (3) LnI2 readily reduce azobenzene under ambient conditions to give binuclear complexes [LnI(THF)2]2(N2Ph2) 2 (Ln=Nd (4)
Knudsen-cell measurements of TmI3(s) and TmI2(s) sublimation enthalpies and of the TmI2(g) disproportionation enthalpy
Struck,Feuersanger
, p. 173 - 192 (2008/10/08)
The enthalpy of sublimation of TmI3(s) to the monomer is measured at 246.3 ± 2.1 kJ/mol at 828 K and to the dimer at 314.7 ± 2.7 kJ/mol at 841 K. The enthalpy of the disproportionation reaction from diiodide to monoiodide and triiodide is measured as + 110.6 ± 6.6 kJ/mol at 967 K. The enthalpy of vaporization of TmI2(s) is measured as 264.5 ± 2.8 kJ/mol at 967 K. The appearance potential curves for the several ions are given, and appearance potentials are extracted using H2O+ and CO2+ as standards. A discussion of the structure of these curves is given in terms of a fitting function. The fit allows assigning the structure to the electronic states of the molecular ion, and affords a first measurement of the energies of these electronic states.
