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1. Probing the electronic structure of the CoB ₁₆ ⁻ drum complex: Unusual oxidation state of Co ⁻¹

   https://doi.org/10.1063/1674-0068/cjcp1903050  

   Li, Wan-Lu; Chen, Teng-Teng; Jiang, Zhi-Yu; Chen, Wei-Jia; Hu, Han-Shi; Wang, Lai-Sheng; Li, Jun (April 2019, Chinese Journal of Chemical Physics)
2. Crystallographic characterization of rare-earth cyanotriphenylborate complexes and the cyanoborates [NCBPh ₃ ] ¹⁻ , [NCBPh ₂ Me] ¹⁻ , and [NCBPh ₂ (μ-O)BPh ₂ ] ¹⁻

   https://doi.org/10.1107/S2056989021006861  

   Dumas, Megan T.; White, Jessica R.; Ziller, Joseph W.; Evans, William J. (August 2021, Acta Crystallographica Section E Crystallographic Communications)

   The investigation of the coordination chemistry of rare-earth metal complexes with cyanide ligands led to the isolation and crystallographic characterization of the Ln III cyanotriphenylborate complexes dichlorido(cyanotriphenylborato-κ N )tetrakis(tetrahydrofuran-κ O )lanthanide(III), [ Ln Cl 2 (C 19 H 15 BN)(C 4 H 8 O) 4 ] [lanthanide ( Ln ) = dysprosium (Dy) and yttrium Y)] from reactions of LnCl 3 , KCN, and NaBPh 4 . Attempts to independently synthesize the tetraethylammonium salt of (NCBPh 3 ) − from BPh 3 and [NEt 4 ][CN] in THF yielded crystals of the phenyl-substituted cyclic borate, tetraethylazanium 2,2,4,6-tetraphenyl-1,3,5,2λ 4 ,4,6-trioxatriborinan-2-ide, C 8 H 20 N + ·C 24 H 20 B 3 O 3 − or [NEt 4 ][B 3 (μ-O) 3 (C 6 H 5 ) 4 ]. The mechanochemical reaction of BPh 3 and [NEt 4 ][CN] without solvent produced crystals of tetraethylazanium cyanodiphenyl-λ 4 -boranyl diphenylborinate, C 8 H 20 N + ·C 25 H 20 B 2 NO − or [NEt 4 ][NCBPh 2 (μ-O)BPh 2 ]. Reaction of BPh 3 and KCN in THF in the presence of 2.2.2-cryptand (crypt) led to a crystal of bis[(2.2.2-cryptand)potassium] 2,2,4,6-tetraphenyl-1,3,5,2λ 4 ,4,6-trioxatriborinan-2-ide cyanomethyldiphenylborate tetrahydrofuran disolvate, 2C 18 H 36 KN 2 O 6 + ·C 24 H 20 B 3 O 3 − ·C 14 H 13 BN − ·2C 4 H 8 O or [K(crypt)] 2 [B 3 (μ-O) 3 (C 6 H 5 ) 4 ][NCBPh 2 Me]·2THF. The [NCBPh 2 (μ-O)BPh 2 ] 1− and (NCBPh 2 Me) 1− anions have not been structurally characterized previously. The structure of 1-Y was refined as a two-component twin with occupancy factors 0.513 (1) and 0.487 (1). In 4 , one solvent molecule was disordered and included using multiple components with partial site-occupancy factors. 

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3. Ultraviolet Excitation of M-O ₂ (M = Phenalenone, Fluorenone, Pyridine, & Acridine) Complexes Resulting in ¹ O ₂

   https://doi.org/10.1021/acs.jpca.4c00143  

   Parsons, Bradley F.; Hulce, Martin R.; Ackerman, John R.; Reardon, Kylie A.; Pappas, Emerson S.; Kettler, Lauren E. (April 2024, The Journal of Physical Chemistry A)

   In our experiment, a trace amount of an organic molecule (M = 1H-phenalen-1-one, 9-fluorenone, pyridine, or acridine) was seeded into a gas mix consisting of 3% O₂ with a rare gas buffer (He or Ar) and then supersonically expanded. We excited the resulting molecular beam with ultraviolet light at either 355 nm (1H-phenalen-1-one, 9-fluorenone, or acridine) or 266 nm (pyridine) and used resonance enhanced multiphoton ionization (REMPI) spectroscopy to probe for formation of O₂ in the a ¹Δ_g state, ¹O₂. For all systems, the REMPI spectra demonstrates that ultraviolet excitation results in formation of ¹O₂ and the oxygen product is confirmed to be in the ground vibrational state and with an effective rotational temperature below 80 K. We then recorded the velocity map ion image of the ¹O₂ product. From the ion images we determined the center-of-mass translational energy distribution, P(E_T), assuming photodissociation of a bimolecular M-O₂ complex. We also report results from electronic structure calculations that allow for a determination of the M-O₂ ground state binding energy. We use the complex binding energy, the energy to form ¹O₂, and the adiabatic triplet energy for each organic molecule to determine the available energy following photodissociation. For dissociation of a bimolecular complex, this available energy may be partitioned into either center-of-mass recoil or internal degrees of freedom of the organic moiety. We use the available energy to generate a Prior distribution, which predicts statistical energy partitioning during dissociation. For low available energies, less than 0.2 eV, we find the statistical prediction is in reasonable agreement with the experimental observations. However, at higher available energies the experimental distribution is biased to lower center-of-mass kinetic energies compared with the statistical prediction, which suggests the complex undergoes vibrational predissociation. 

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4. Quantum-state-specific reaction rate measurements for the photo-induced reaction Ca ⁺ + O ₂ → CaO ⁺ + O

   https://doi.org/10.1080/00268976.2019.1622811  

   Schmid, Philipp C.; Miller, Mikhail I.; Greenberg, James; Nguyen, Thanh L.; Stanton, John F.; Lewandowski, H. J. (May 2019, Molecular Physics)
5. Gas-Phase Preparation of 1-Germavinylidene (H ₂ CGe; X ¹ A ₁ ), the Isovalent Counterpart of Vinylidene (H ₂ CC; X ¹ A ₁ ), via Non-adiabatic Dynamics through the Elementary Reaction of Ground State Atomic Carbon (C; ³ P) with Germane (GeH ₄ ; X ¹ A ₁ )

   https://doi.org/10.1021/acs.jpclett.2c03749  

   Yang, Zhenghai; Sun, Bing-Jian; He, Chao; Li, Jin-Qi; Chang, Agnes H.; Kaiser, Ralf I. (January 2023, The Journal of Physical Chemistry Letters)