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  • Kuntrapakam, Hema, et al. (author)
  • Guest Encapsulation Alters the Thermodynamic Landscape of a Coordination Host
  • 2023
  • In: Journal of the American Chemical Society. - 1520-5126 .- 0002-7863. ; 145:45, s. 24755-24764
  • Journal article (peer-reviewed)abstract
    • The architecture of self-assembled host molecules can profoundly affect the properties of the encapsulated guests. For example, a rigid cage with small windows can efficiently protect its contents from the environment; in contrast, tube-shaped, flexible hosts with large openings and an easily accessible cavity are ideally suited for catalysis. Here, we report a “Janus” nature of a Pd6L4 coordination host previously reported to exist exclusively as a tube isomer (T). We show that upon encapsulating various tetrahedrally shaped guests, T can reconfigure into a cage-shaped host (C) in quantitative yield. Extracting the guest affords empty C, which is metastable and spontaneously relaxes to T, and the T⇄C interconversion can be repeated for multiple cycles. Reversible toggling between two vastly different isomers paves the way toward controlling functional properties of coordination hosts “on demand”.
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