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   https://doi.org/10.1039/c6cp02649d  

   Chen, Hanjiao; Maryasov, Alexander G.; Rogozhnikova, Olga Yu.; Trukhin, Dmitry V.; Tormyshev, Victor M.; Bowman, Michael K. (January 2016, Phys. Chem. Chem. Phys.)
2. Excitation Energy Transfer and Exchange‐Mediated Quartet State Formation in Porphyrin‐Trityl Systems

   https://doi.org/10.1002/chem.202002805  

   Nolden, Oliver; Fleck, Nico; Lorenzo, Emmaline R.; Wasielewski, Michael R.; Schiemann, Olav; Gilch, Peter; Richert, Sabine (February 2021, Chemistry – A European Journal)

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3. Cleavage-Resistant Protein Labeling With Hydrophilic Trityl Enables Distance Measurements In-Cell

   https://doi.org/10.1021/acs.jpcb.1c02371  

   Hasanbasri, Zikri; Singewald, Kevin; Gluth, Teresa D.; Driesschaert, Benoit; Saxena, Sunil (April 2021, The Journal of Physical Chemistry B)

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   Sensitive in-cell distance measurements in proteins using pulsed-Electron Spin Resonance (ESR) require reduction-resistant and cleavage-resistant spin-labels. Among the reduction-resistant moieties, the hydrophilic trityl core known as OX063 is promising due to its long phase-memory relaxation time (T_m). This property leads to a sufficiently intense ESR signal for reliable distance measurements. Furthermore, the T_m of OX063 remains sufficiently long at higher temperatures, opening the possibility for measurements at temperatures above 50 K. In this work, we synthesized deuterated OX063 with a maleimide linker (mOX063-d24). We show that the combination of the hydrophilicity of the label and the maleimide linker enables high protein labeling that is cleavage-resistant in-cells. Distance measurements performed at 150 K using this label are more sensitive than the measurements at 80 K. The sensitivity gain is due to the significantly short longitudinal relaxation time (T_1) at higher temperatures, which enables more data collection per unit of time. In addition to in vitro experiments, we perform distance measurements in Xenopus laevis oocytes. Interestingly, the T_m of mOX063-d24 is sufficiently long even in the crowded environment of the cell, leading to signals of appreciable intensity. Overall, mOX063-d24 provides highly sensitive distance measurements both in vitro and in-cells. 

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4. A new 13C trityl-based spin label enables the use of DEER for distance measurements

   https://doi.org/10.1016/j.jmr.2022.107363  

   Hasanbasri, Zikri; Poncelet, Martin; Hunter, Hannah; Driesschaert, Benoit; Saxena, Sunil (February 2023, Journal of Magnetic Resonance)
5. Synthesis and X-Ray crystallography of a substituted trityl fluoride: Ordering power of a C-F bond

   https://doi.org/10.1016/j.jfluchem.2019.109377  

   York, Gabriel D.; Siegler, Maxime A.; Patel, Dhaval D.; Lectka, Thomas (December 2019, Journal of Fluorine Chemistry)