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   https://doi.org/10.1002/mas.21847  

   Gozzo, Theresa A. ; Bush, Matthew F. ( January 2023 , Mass Spectrometry Reviews)

   Havlíček, Vladimír (Ed.)

   Collision cross-section values, which can be determined using ion mobility experiments, are sensitive to the structures of protein ions and useful for applications to structural biology and biophysics. Protein ions with different charge states can exhibit very different collision cross-section values, but a comprehensive understanding of this relationship remains elusive. Here, we review cation-to-anion, proton-transfer reactions (CAPTR), a method for generating a series of charge-reduced protein cations by reacting quadrupole-selected cations with even-electron monoanions. The resulting CAPTR products are analyzed using a combination of ion mobility, mass spectrometry, and collisional activation. We compare CAPTR to other charge-manipulation strategies and review the results of various CAPTR-based experiments, exploring their contribution to a deeper understanding of the relationship between protein ion structure and charge state. 

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2. Stability Effects of Selective Anion Abstraction from Cesium Lead Halide Perovskite Nanocrystals

   https://doi.org/10.1021/acs.jpcc.2c07017  

   Stoffel, Jonathan T. ; Tsui, Emily Y. ( February 2023 , The Journal of Physical Chemistry C)
3. Liquid Structure of CO 2 –Reactive Aprotic Heterocyclic Anion Ionic Liquids from X-ray Scattering and Molecular Dynamics

   https://doi.org/10.1021/acs.jpcb.6b07713  

   Sheridan, Quintin R. ; Oh, Seungmin ; Morales-Collazo, Oscar ; Castner, Edward W. ; Brennecke, Joan F. ; Maginn, Edward J. ( November 2016 , The Journal of Physical Chemistry B)
4. Astronomical Detection of the Interstellar Anion C 10 H − toward TMC-1 from the GOTHAM Large Program on the Green Bank Telescope

   https://doi.org/10.3847/2041-8213/acb648  

   Remijan, Anthony ; Scolati, Haley N. ; Burkhardt, Andrew M. ; Changala, P. Bryan ; Charnley, Steven B. ; Cooke, Ilsa R. ; Cordiner, Martin A. ; Gupta, Harshal ; Herbst, Eric ; Kelvin Lee, Kin Long ; et al ( February 2023 , The Astrophysical Journal Letters)

   Abstract Using data from the Green Bank Telescope (GBT) Observations of TMC-1: Hunting for Aromatic Molecules (GOTHAM) survey, we report the first astronomical detection of the C 10 H − anion. The astronomical observations also provided the necessary data to refine the spectroscopic parameters of C 10 H − . From the velocity stacked data and the matched filter response, C 10 H − is detected at >9 σ confidence level at a column density of 4.04 − 2.23 + 10.67 × 10 11 cm −2 . A dedicated search for the C 10 H radical was also conducted toward TMC-1. In this case, the stacked molecular emission of C 10 H was detected at a ∼3.2 σ confidence interval at a column density of 2.02 − 0.82 + 2.68 × 10 11 cm −2 . However, as the determined confidence level is currently <5 σ , we consider the identification of C 10 H as tentative. The full GOTHAM data set was also used to better characterize the physical parameters including column density, excitation temperature, line width, and source size for the C 4 H, C 6 H, and C 8 H radicals and their respective anions, and the measured column densities were compared to the predictions from a gas/grain chemical formation model and from a machine learning analysis. Given the measured values, the C 10 H − /C 10 H column density ratio is ∼ 2.0 − 1.6 + 5.9 —the highest value measured between an anion and neutral species to date. Such a high ratio is at odds with current theories for interstellar anion chemistry. For the radical species, both models can reproduce the measured abundances found from the survey; however, the machine learning analysis matches the detected anion abundances much better than the gas/grain chemical model, suggesting that the current understanding of the formation chemistry of molecular anions is still highly uncertain. 

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   https://doi.org/10.1016/j.polymer.2022.124811  

   Treichel, Megan ; Gaitor, Jamie C. ; Birch, Chris ; Vinskus, Jessica L. ; Noonan, Kevin J.T. ( May 2022 , Polymer)