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1. Vitamin B ₁₂ Derivative Enables Cobalt-Catalyzed Atom Transfer Radical Polymerization

   https://doi.org/10.1021/jacs.3c06783  

   Dadashi-Silab, Sajjad; Preston-Herrera, Cristina; Stache, Erin E (September 2023, Journal of the American Chemical Society)
2. Vitamin B ₁₂ -dependent biosynthesis ties amplified 2-methylhopanoid production during oceanic anoxic events to nitrification

   https://doi.org/10.1073/pnas.2012357117  

   Elling, Felix J.; Hemingway, Jordon D.; Evans, Thomas W.; Kharbush, Jenan J.; Spieck, Eva; Summons, Roger E.; Pearson, Ann (December 2020, Proceedings of the National Academy of Sciences)

   Bacterial hopanoid lipids are ubiquitous in the geologic record and serve as biomarkers for reconstructing Earth’s climatic and biogeochemical evolution. Specifically, the abundance of 2-methylhopanoids deposited during Mesozoic ocean anoxic events (OAEs) and other intervals has been interpreted to reflect proliferation of nitrogen-fixing marine cyanobacteria. However, there currently is no conclusive evidence for 2-methylhopanoid production by extant marine cyanobacteria. As an alternative explanation, here we report 2-methylhopanoid production by bacteria of the genusNitrobacter, cosmopolitan nitrite oxidizers that inhabit nutrient-rich freshwater, brackish, and marine environments. The model organismNitrobacter vulgarisproduced only trace amounts of 2-methylhopanoids when grown in minimal medium or with added methionine, the presumed biosynthetic methyl donor. Supplementation of cultures with cobalamin (vitamin B₁₂) increased nitrite oxidation rates and stimulated a 33-fold increase of 2-methylhopanoid abundance, indicating that the biosynthetic reaction mechanism is cobalamin dependent. BecauseNitrobacterspp. cannot synthesize cobalamin, we postulate that they acquire it from organisms inhabiting a shared ecological niche—for example, ammonia-oxidizing archaea. We propose that during nutrient-rich conditions, cobalamin-based mutualism intensifies upper water column nitrification, thus promoting 2-methylhopanoid deposition. In contrast, anoxia underlying oligotrophic surface ocean conditions in restricted basins would prompt shoaling of anaerobic ammonium oxidation, leading to low observed 2-methylhopanoid abundances. The first scenario is consistent with hypotheses of enhanced nutrient loading during OAEs, while the second is consistent with the sedimentary record of Pliocene–Pleistocene Mediterranean sapropel events. We thus hypothesize that nitrogen cycling in the Pliocene–Pleistocene Mediterranean resembled modern, highly stratified basins, whereas no modern analog exists for OAEs. 

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3. Ultrafast Excited State Dynamics and Fluorescence from Vitamin B ₁₂ and Organometallic [Co]–C≡C–R Cobalamins

   https://doi.org/10.1021/acs.jpcb.0c04886  

   Salerno, Elvin V.; Miller, Nicholas A.; Konar, Arkaprabha; Li, Yan; Kieninger, Christoph; Kräutler, Bernhard; Sension, Roseanne J. (July 2020, The Journal of Physical Chemistry B)

   null (Ed.)
4. Solvation Environment and Interface Dynamics of Li ₂ B ₁₂ H ₁₂ and Li ₂ B ₁₂ F ₁₂ Electrolytes Uncovered by Theory and Operando Optical and FTIR Spectroelectrochemistry

   https://doi.org/10.1021/acsami.4c14485  

   Simonyan, Hovnan; Zhong, Linda; Green, Matthew_M; Movsesyan, Khoren; Fraire, Andrew; Ward, Patrick_A; Lau, Kah_Chun; Teprovich, Jr., Joseph_A (December 2024, ACS Applied Materials & Interfaces)
5. Sn _4−δ B ₁₂ Se ₁₂ [Q _x ], Q = Se, Te, a B ₁₂ Cluster Tunnel Framework Hosting Neutral Chalcogen Chains

   https://doi.org/10.1021/acs.chemmater.0c04503  

   Chica, Daniel G.; Spanopoulos, Ioannis; Hao, Shiqiang; Wolverton, Chris; Kanatzidis, Mercouri G. (March 2021, Chemistry of Materials)

   null (Ed.)