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1. Unusual single crystal to single crystal phase transition of a nicotine salt monitored using temperature dependent single crystal X-ray diffraction

   https://doi.org/10.1039/D3CE00042G  

   Angevine, Devin J.; Mitchell, Travis; Zhang, Xiaotong; Benedict, Jason B. (April 2023, CrystEngComm)

   The organic salt ( S )-nicotinium 2,6-dihydroxybenzoate undergoes reversible single crystal to single crystal phase transition at 104 K. The phase transition was monitored using temperature dependent single crystal X-ray diffraction and was attributed to symmetry breaking translations and rotations of the crystal components. 

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2. Structural flexibility of halogen bonds showed in a single-crystal-to-single-crystal [2+2] photodimerization

   https://doi.org/10.1107/S2052252518007583  

   Sinnwell, Michael A.; Blad, Jared N.; Thomas, Logan R.; MacGillivray, Leonard R. (July 2018, IUCrJ)

   Halogen bonds have emerged as noncovalent forces that govern the assembly of molecules in organic solids with a degree of reliability akin to hydrogen bonds. Although the structure-directing roles of halogen bonds are often compared to hydrogen bonds, general knowledge concerning the fundamental structural behavior of halogen bonds has had limited opportunity to develop. Following an investigation of solid-state reactions involving organic syntheses and the development of photoresponsive materials, this work demonstrates the ability of the components of intermolecular N...I halogen bonding – a `workhorse' interaction for the crystal engineer – to support a single-crystal-to-single-crystal [2+2] photodimerization. A comparison is provided of the geometric changes experienced by the halogen-bonded components in the single-crystal reaction to the current crystal landscape of N...I halogen bonds, as derived from the Cambridge Structural Database. Specifically, a linear-to-bent type of deformation of the halogen-bonded components was observed, which is expected to support the development of functional halogen-bonded materials containing molecules that can undergo movements in close-packed crystal environments. 

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3. Color-Tunable Upconversion-Emission Switch Based on Cocrystal-to-Cocrystal Transformation

   https://doi.org/10.1021/jacs.2c11425  

   Wang, Yu; Wu, Huang; Jones, Leighton O.; Mosquera, Martín A.; Stern, Charlotte L.; Schatz, George C.; Stoddart, J. Fraser (January 2023, Journal of the American Chemical Society)
4. 4f-orbital covalency enables a single-crystal-to-single-crystal ring-opening isomerization in a CeIV–cyclopropenyl complex

   https://doi.org/10.1038/s41557-025-01791-2  

   Vincenzini, Brett D; Yu, Xiaojuan; Paloc, Sébastien; Smith, Patrick W; Gupta, Himanshu; Pandey, Pragati; Kent, Greggory T; Ordonez, Osvaldo; Keller, Taylor; Gau, Michael R; et al (June 2025, Nature Chemistry)
5. Single-Crystal-to-Single-Crystal [2 + 2] Photodimerization Involving B←N Coordination with Generation of a Thiophene Host

   https://doi.org/10.1021/acs.organomet.0c00258  

   Campillo-Alvarado, Gonzalo; Li, Changan; Feng, Zhiting; Hutchins, Kristin M.; Swenson, Dale C.; Höpfl, Herbert; Morales-Rojas, Hugo; MacGillivray, Leonard R. (June 2020, Organometallics)

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