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1. H ₂ evolution from H ₂ O via O–H oxidative addition across a 9,10-diboraanthracene

   https://doi.org/10.1039/D0CC05261B  

   Taylor, Jordan W.; Harman, W. Hill (November 2020, Chemical Communications)

   null (Ed.)

   The water reactivity of the boroauride complex ([Au(B 2 P 2 )][K(18-c-6)]; (B 2 P 2 , 9,10-bis(2-(diisopropylphosphino)-phenyl)-9,10-dihydroboranthrene) and its corresponding two-electron oxidized complex, Au(B 2 P 2 )Cl, are presented. Au(B 2 P 2 )Cl is tolerant to H 2 O and forms the hydroxide complex Au(B 2 P 2 )OH in the presence of H 2 O and triethylamine. [Au(B 2 P 2 )]Cl and [Au(B 2 P 2 )]OH are poor Lewis acids as judged by the Gutmann–Becket method, with [Au(B 2 P 2 )]OH displaying facile hydroxide exchange between B atoms of the DBA ring as evidenced by variable temperature NMR spectroscopy. The reduced boroauride complex [Au(B 2 P 2 )] − reacts with 1 equivalent of H 2 O to produce a hydride/hydroxide product, [Au(B 2 P 2 )(H)(OH)] − , that rapidly evolves H 2 upon further H 2 O reaction to yield the dihydroxide compound, [Au(B 2 P 2 )(OH) 2 ] − . [Au(B 2 P 2 )]Cl can be regenerated from [Au(B 2 P 2 )(OH) 2 ] − via HCl·Et 2 O, providing a synthetic cycle for H 2 evolution from H 2 O enabled by O–H oxidative addition at a diboraanthracene unit. 

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2. Mixed norm H ₂ / H _∞ and entropy covariance control: a convex optimisation approach

   https://doi.org/10.1080/00207179.2020.1833251  

   Haddad, Wassim M.; Lanchares, Manuel; Chen, Yongxin (January 2020, International Journal of Control)

   null (Ed.)
3. Probing the Conditions for the H i-to-H ₂ Transition in the Interstellar Medium

   https://doi.org/10.3847/1538-4357/ace164  

   Park, Gyueun; Lee, Min-Young; Bialy, Shmuel; Burkhart, Blakesley; Dawson, J R; Heiles, Carl; Li, Di; Murray, Claire; Nguyen, Hiep; Hafner, Anita; et al (September 2023, The Astrophysical Journal)

   Abstract We investigate the conditions for the Hi-to-H₂transition in the solar neighborhood by analyzing Hiemission and absorption measurements toward 58 Galactic lines of sight (LOSs) along with¹²CO(1–0) (CO) and dust data. Based on the accurate column densities of the cold and warm neutral medium (CNM and WNM), we first perform a decomposition of gas into atomic and molecular phases, and show that the observed LOSs are mostly Hi-dominated. In addition, we find that the CO-dark H₂, not the optically thick Hi, is a major ingredient of the dark gas in the solar neighborhood. To examine the conditions for the formation of CO-bright molecular gas, we analyze the kinematic association between Hiand CO, and find that the CNM is kinematically more closely associated with CO than the WNM. When CNM components within CO line widths are isolated, we find the following characteristics: spin temperature < 200 K, peak optical depth > 0.1, CNM fraction of ∼0.6, andV-band dust extinction > 0.5 mag. These results suggest that CO-bright molecular gas preferentially forms in environments with high column densities where the CNM becomes colder and more abundant. Finally, we confront the observed CNM properties with the steady-state H₂formation model of Sternberg et al. and infer that the CNM must be clumpy with a small volume filling factor. Another possibility would be that missing processes in the model, such as cosmic-rays and gas dynamics, play an important role in the Hi-to-H₂transition. 

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4. Phase Behavior and Superprotonic Conductivity in the System (1– x )CsH ₂ PO ₄ – x H ₃ PO ₄ : Discovery of Off-Stoichiometric α-[Cs _1–x H _x ]H ₂ PO ₄

   https://doi.org/10.1021/acs.chemmater.1c04061  

   Wang, Louis S.; Patel, Sawankumar V.; Truong, Erica; Hu, Yan-Yan; Haile, Sossina M. (February 2022, Chemistry of Materials)
5. Improved Performance and Efficiency of Lanthanum–Strontium–Manganese Perovskites Undergoing Isothermal Redox Cycling under Controlled p H ₂ O/ p H ₂

   https://doi.org/10.1021/acs.energyfuels.0c02872  

   Lee, Kangjae; McCord, Dylan C.; Carrillo, Richard J.; Guyll, Bella; Scheffe, Jonathan R. (December 2020, Energy & Fuels)

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