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1. Yb- and Mn-Doped Lead-Free Double Perovskite Cs ₂ AgBiX ₆ (X = Cl ^– , Br ^– ) Nanocrystals

   https://doi.org/10.1021/acsami.9b02367  

   Chen, Na; Cai, Tong; Li, Wenhao; Hills-Kimball, Katie; Yang, Hanjun; Que, Meidan; Nagaoka, Yasutaka; Liu, Zhenyang; Yang, Dong; Dong, Angang; et al (April 2019, ACS Applied Materials & Interfaces)
2. Interactions Between [PdX ₄ ] ²⁻ (X=Cl, Br) Dianions in Presence of Counterions

   https://doi.org/10.1002/cphc.202400712  

   Trzęsowska, Natasza; Wysokiński, Rafał; Hajlaoui, Fadhel; Zouari, Nabil; Michalczyk, Mariusz; Scheiner, Steve; Zierkiewicz, Wiktor (December 2024, ChemPhysChem)

   Abstract The interaction between two square palladium (II) dianions PdX₄²⁻(X=Cl, Br) is evaluated by crystal study and analyzed by quantum chemical means. The arrangement within the crystal between each pair of PdX₄²⁻neighbors is suggestive of a Pd⋅⋅⋅X noncovalent bond, which is verified by a battery of computational protocols. While the potential between these two bare dianions is computed to be highly repulsive, the introduction of even just two counterions makes this interaction attractive, as does the presence of a constellation of point charges. It is concluded that there is indeed a stabilizing Pd⋅⋅⋅X bond, but it is incapable of overcoming the strong coulombic repulsive force between two dianions. While the QTAIM, NBO, and NCI tools can indicate the presence of a noncovalent bond, they are unable to distinguish an attractive from a repulsive interaction. 

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3. Anion⋯anion (MX ₃ ⁻ ) ₂ dimers (M = Zn, Cd, Hg; X = Cl, Br, I) in different environments

   https://doi.org/10.1039/D1CP01502H  

   Wysokiński, Rafał; Zierkiewicz, Wiktor; Michalczyk, Mariusz; Scheiner, Steve (July 2021, Physical Chemistry Chemical Physics)

   The possibility that MX 3 − anions can interact with one another is assessed via ab initio calculations in gas phase as well as in aqueous and ethanol solution. A pair of such anions can engage in two different dimer types. In the bridged configuration, two X atoms engage with two M atoms in a rhomboid structure with four equal M–X bond lengths. The two monomers retain their identity in the stacked geometry which contains a pair of noncovalent M⋯X interactions. The relative stabilities of these two structures depend on the nature of the central M atom, the halogen substituent, and the presence of solvent. The interaction and binding energies are fairly small, generally no more than 10 kcal mol −1 . The large electrostatic repulsion is balanced by a strong attractive polarization energy. 

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4. Rapid Simultaneous Removal of Toxic Anions [HSeO ₃ ] ⁻ , [SeO ₃ ] ^2– , and [SeO ₄ ] ^2– , and Metals Hg ²⁺ , Cu ²⁺ , and Cd ²⁺ by MoS ₄ ^2– Intercalated Layered Double Hydroxide

   https://doi.org/10.1021/jacs.7b07123  

   Ma, Lijiao; Islam, Saiful M.; Xiao, Chengliang; Zhao, Jing; Liu, Hongyun; Yuan, Mengwei; Sun, Genban; Li, Huifeng; Ma, Shulan; Kanatzidis, Mercouri G. (September 2017, Journal of the American Chemical Society)
5. Spinodal Decomposition During Anion Exchange in Colloidal Mn ²⁺ -Doped CsPbX ₃ (X = Cl, Br) Perovskite Nanocrystals

   https://doi.org/10.1021/acs.chemmater.9b02646  

   De Siena, Michael C.; Sommer, David E.; Creutz, Sidney E.; Dunham, Scott T.; Gamelin, Daniel R. (August 2019, Chemistry of Materials)