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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. Different Rise Times of Atomic Br M _4,5 3d _3/2,5/2 Core Level Absorptions during Br ₂ C ¹ Π _u 1 _u State Dissociation via Extreme Ultraviolet Transient Absorption Spectroscopy

   https://doi.org/10.1021/acs.jpca.5c06776  

   Beetar, John E; Ou, Jen-Hao; Kobayashi, Yuki; Leone, Stephen R (December 2025, The Journal of Physical Chemistry A)

   The reported “dissociation times” for the Br2 C (1Πu 1u) state by various measurement methods differ widely across the literature (30 to 340 fs). We consider this issue by investigating attosecond extreme ultraviolet (XUV) transient absorption spectroscopy at the Br M4,5 3d3/2,5/2 edges (66 to 80 eV), tracking core-to-valence (3d → 4p) and core-to-Rydberg (3d → ns, np, n ≥ 5) transitions from the molecular to atomic limit. The progress of dissociation can be ascertained by the buildup of the atomic absorption in time. Notably, the measured rise times of the 3d5/2, 3/2 → 4p transitions depend on the probed core level final state, 38 ± 1 and 20 ± 5 fs for 2D5/2 and 2D3/2 at 64.31 and 65.34 eV, respectively. Simulations by the nuclear time-dependent Schrödinger equation reproduce the rise-time difference of the 3d → 4p transitions, and the theory suggests several important factors. One is the transition dipole moments of each probe transition have different molecular and atomic values for 2D5/2 versus 2D3/2 that depend on the bond length. The other is the merger of multiple molecular absorptions into the same atomic absorption, creating multiple timescales even for a single probe transition. Unfortunately, the core-to-Rydberg absorptions did not allow accurate atomic Br buildup times to be extracted due to spectral overlaps with ground state bleaching, otherwise an even more comprehensive picture of the role of the probe state transition would be possible. This work shows that the measured probe signals accurately contain the dissociative wavepacket dynamics but also reveal how the specific probe transition affects the apparent progress toward dissociation with bond length. Such potential probe-transition-dependent effects need to be considered when interpreting measured signals and their timescales. 

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