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1. Spectroscopic and electrochemical characterization of a Pr ⁴⁺ imidophosphorane complex and the redox chemistry of Nd ³⁺ and Dy ³⁺ complexes

   https://doi.org/10.1039/D2DT00758D  

   Rice, Natalie T.; Popov, Ivan A.; Carlson, Rebecca K.; Greer, Samuel M.; Boggiano, Andrew C.; Stein, Benjamin W.; Bacsa, John; Batista, Enrique R.; Yang, Ping; La Pierre, Henry S. (May 2022, Dalton Transactions)

   The molecular tetravalent oxidation state for praseodymium is observed in solution via oxidation of the anionic trivalent precursor [K][Pr 3+ (NP(1,2-bis- t Bu-diamidoethane)(NEt 2 )) 4 ] (1-Pr(NP*)) with AgI at −35 °C. The Pr 4+ complex is characterized in solution via cyclic voltammetry, UV-vis-NIR electronic absorption spectroscopy, and EPR spectroscopy. Electrochemical analyses of [K][Ln 3+ (NP(1,2-bis- t Bu-diamidoethane)(NEt 2 )) 4 ] (Ln = Nd and Dy) by cyclic voltammetry are reported and, in conjunction with theoretical modeling of electronic structure and oxidation potential, are indicative of principal ligand oxidations in contrast to the metal-centered oxidation observed for 1-Pr(NP*). The identification of a tetravalent praseodymium complex in in situ UV-vis and EPR experiments is further validated by theoretical modeling of the redox chemistry and the UV-vis spectrum. The latter study was performed by extended multistate pair-density functional theory (XMS-PDFT) and implicates a multiconfigurational ground state for the tetravalent praseodymium complex. 

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2. Evaluating mid-IR laser potential of Er ³⁺ vs. Dy ³⁺ in low-maximum-phonon-energy hosts for 4.1-4.8 µm applications

   https://doi.org/10.1364/OME.572481  

   Brown, Ei_Ei; Fleischman, Zackery_D; Merkle, Larry; Hommerich, Uwe; McKay, Jason; Palosz, Witold; Trivedi, Sudhir; Dubinskii, Mark (August 2025, Optical Materials Express)

   A comparative spectroscopic investigation was conducted to evaluate the potential of Dy³⁺and Er³⁺doped Ga₂Ge₅S₁₃chalcogenide glass and CsCdCl3 crystal for suitability as gain media for mid-infrared lasers operating within the 4.1-4.8 (m spectral range. Both rare-earth ions exhibited broad mid-IR emissions at room temperature centered at ∼4.4-4.5 µm, attributed to the Dy³⁺:⁶H_11/2→⁶H_13/2and Er³⁺:⁴I_9/2→⁴I_11/2transitions. The fluorescence lifetimes of these mid-IR transitions varied significantly between these two host materials. Dy³⁺and Er³⁺doped CsCdCl₃crystals exhibited long lifetimes of ∼9-12 ms, while the same ions in Ga₂Ge₅S₁₃glass yielded lifetimes in the range of ∼1 ms. Temperature-dependent lifetime measurements further confirmed the role of multiphonon relaxation in Dy³⁺: Ga₂Ge₅S₁₃, although fitting with the temperature dependence of the multiphonon energy-gap law indicated the presence of additional nonradiative decay channels, likely involving impurity interactions. In contrast, Er³⁺emissions exhibited minimal temperature dependence across both hosts, with measured lifetimes closely matching calculated radiative values. Judd-Ofelt analyses revealed radiative properties and transition probabilities comparable to other low-maximum-phonon-energy rare-earth-doped hosts, with the studied Dy³⁺doped host materials standing out by offering sigma-tau products several times higher than those of Er³⁺in the same hosts. 

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3. Why is it so difficult to realize Dy ⁴⁺ in as‐synthesized BaZrO ₃ ?

   https://doi.org/10.1111/jace.18427  

   Hoang, Khang; Latouche, Camille; Jobic, Stéphane (June 2022, Journal of the American Ceramic Society)
4. Correlation between Cation Distribution and Magnetic and Dielectric Properties of Dy ³⁺ -Substituted Fe-Rich Cobalt Ferrite

   https://doi.org/10.1021/acs.inorgchem.2c03125  

   Kharat, Shahaji P.; Gaikwad, Swati K.; Kambale, Rahul C.; Kolekar, Yesh D.; Ramana, C. V. (December 2022, Inorganic Chemistry)
5. Tuning white light emission using single-component tetrachroic Dy ³⁺ metallacrowns: the role of chromophoric building blocks

   https://doi.org/10.1039/D4SC00389F  

   Salerno, Elvin V; Eliseeva, Svetlana V; Petoud, Stéphane; Pecoraro, Vincent L (May 2024, Chemical Science)

   The fine tuning of CIE coordinates was demonstrated in a series of molecular tetrachroic chromophores, Dy³⁺/Ga³⁺metallacrowns, through modifications of the symmetry around Dy³⁺and the nature of the organic ligands. 

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