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1. Measurements of ¹⁸ O ¹⁸ O and ¹⁷ O ¹⁸ O in the atmosphere and the role of isotope-exchange reactions: ¹⁸ O ¹⁸ O AND ¹⁷ O ¹⁸ O IN THE ATMOSPHERE

   https://doi.org/10.1029/2012JD017992  

   Yeung, Laurence Y.; Young, Edward D.; Schauble, Edwin A. (September 2012, Journal of Geophysical Research: Atmospheres)
2. Synthesis of Ln ^II ‐in‐Cryptand Complexes by Chemical Reduction of Ln ^III ‐in‐Cryptand Precursors: Isolation of a Nd ^II ‐in‐Cryptand Complex

   https://doi.org/10.1002/anie.202006393  

   Huh, Daniel N.; Ciccone, Sierra R.; Bekoe, Samuel; Roy, Saswata; Ziller, Joseph W.; Furche, Filipp; Evans, William J. (June 2020, Angewandte Chemie International Edition)

   Abstract Lanthanide triflates have been used to incorporate Nd^IIIand Sm^IIIions into the 2.2.2‐cryptand ligand (crypt) to explore their reductive chemistry. The Ln(OTf)₃complexes (Ln=Nd, Sm; OTf=SO₃CF₃) react with crypt in THF to form the THF‐soluble complexes [Ln^III(crypt)(OTf)₂][OTf] with two triflates bound to the metal encapsulated in the crypt. Reduction of these Ln^III‐in‐crypt complexes using KC₈in THF forms the neutral Ln^II‐in‐crypt triflate complexes [Ln^II(crypt)(OTf)₂]. DFT calculations on [Nd^II(crypt)]²⁺], the first Nd^IIcryptand complex, assign a 4f⁴electron configuration to this ion. 

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3. Evolution of Yb ³⁺ Speciation in Cl ^– /Br ^– - and Yb ³⁺ /Gd ³⁺ -Alloyed Quantum-Cutting Lead-Halide Perovskite Nanocrystals

   https://doi.org/10.1021/acs.chemmater.3c01475  

   Roh, Joo Yeon; Sommer, David E.; Milstein, Tyler J.; Dunham, Scott T.; Gamelin, Daniel R. (October 2023, Chemistry of Materials)
4. The versatility of 1,4,8,11-tetraazacyclotetradecane (cyclam) in the formation of compounds of Co ²⁺ , Ni ²⁺ , Cu ²⁺ , and Zn ²⁺ with metal ions in and out of the cyclic ligand ring

   https://doi.org/10.1515/zkri-2023-0026  

   Noor, Mah; Chah, Hamza; Tresp, David; Bernal, Ivan; Lalancette, Roger A. (June 2023, Zeitschrift für Kristallographie - Crystalline Materials)

   Herein we report the results of preparing metal compounds (where the metal ions are Co2+, Ni2+, Cu2+, Zn2+) with the cyclic ligand 1,4,8,11-tetraazacyclotetradecane [cyclam] under a variety of conditions of metal-ligand ratios and solvent media. In all cases, we used metal Cl2 . nH2O salts (except for anhydrous CoCl2), as specified. Outcome: we isolated species with a four-coordinate metal in the N4 cavity of the ligand alone, and also with either one or two additional axial ligands. Those axial ligands can be (a) a single chloride, leading to penta-coordinated+ products; (b) two chlorides, leading to octahedral-neutral compounds; (c) two waters, giving rise to hexa-coordinated [(cyclam)metal(H2O)2]2+ species. Finally, in the case of HCl added to the reaction medium, the cyclam can be di-protonated and appears as [(cyclam)H2]2+ in the crystals. With such a variety of products, it is not surprising that since the metal coordination numbers vary, the cyclam ligand stereochemistries are thereby affected. Interestingly, the [(cyclam)metal] species are invariably hydrogen-bonded to one another in infinite strings of two kinds: (1) those for which the crystal’s Z’ = 1 have single strings; (2) when Z’ = 2, there is a pair of homogeneous strings attached to one another by a variety of hydrogen-bonding linkages. Finally, we observed an interesting pair of hydroxonium cations: the first is hydoxonium cations in a pleated 2-D sheet consisting of fused pentagons located between sheets of [(cyclam)metal] moieties; the second one is an infinite string of composition (H3O+)-(H2O)-(H3O+)-(H2O)-(H3O+)-(H2O)-(H3O+). 

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5. Phosphorescence in Mn ⁴⁺ -Doped R ⁺ / R ²⁺ Germanates ( R ⁺ = Na ⁺ or K ⁺ , R ²⁺ = Sr ²⁺ )

   https://doi.org/10.1021/acs.inorgchem.2c01364  

   Novikov, Sergei A.; Lu, Yimin; Zhang, Weiguo; Halasyamani, P. Shiv; Hariyani, Shruti; Brgoch, Jakoah; Klepov, Vladislav V.; zur Loye, Hans-Conrad; Mozharivskyj, Yurij (June 2022, Inorganic Chemistry)