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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. Phototriggered Guest Release from a Nonporous Organic Crystal: Remarkable Single-Crystal-to-Single-Crystal Transformation of a Binary Cocrystal Solvate to a Ternary Cocrystal

   https://doi.org/10.1021/jacs.0c09732  

   Yelgaonkar, Shweta P.; Campillo-Alvarado, Gonzalo; MacGillivray, Leonard R. (December 2020, Journal of the American Chemical Society)

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3. 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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4. 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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5. Telecommunication-wavelength two-dimensional photonic crystal cavities in a thin single-crystal diamond membrane

   https://doi.org/10.1063/5.0061778  

   Kuruma, Kazuhiro; Piracha, Afaq Habib; Renaud, Dylan; Chia, Cleaven; Sinclair, Neil; Nadarajah, Athavan; Stacey, Alastair; Prawer, Steven; Lončar, Marko (October 2021, Applied Physics Letters)