Versatile non-luminescent color palette based on guest exchange dynamics in paramagnetic cavitands

Elad Goren, Liat Avram and Amnon Bar-Shir ()
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Elad Goren: Faculty of Chemistry, Weizmann Institute of Science
Liat Avram: Faculty of Chemistry, Weizmann Institute of Science
Amnon Bar-Shir: Faculty of Chemistry, Weizmann Institute of Science

Nature Communications, 2021, vol. 12, issue 1, 1-8

Abstract: Abstract Multicolor luminescent portrayal of complexed arrays is indispensable for many aspects of science and technology. Nevertheless, challenges such as inaccessible readouts from opaque objects, a limited visible-light spectrum and restricted spectral resolution call for alternative approaches for multicolor representation. Here, we present a strategy for spatial COlor Display by Exploiting Host-guest Dynamics (CODE-HD), comprising a paramagnetic cavitand library and various guests. First, a set of lanthanide-cradled α-cyclodextrins (Ln-CDs) is designed to induce pseudo-contact shifts in the 19F-NMR spectrum of Ln-CD-bound guest. Then, capitalizing on reversible host-guest binding dynamics and using magnetization-transfer 19F-MRI, pseudo-colored maps of complexed arrays are acquired and applied in molecular-steganography scenarios, showing CODE-HD’s ability to generate versatile outputs for information encoding. By exploiting the widely shifted resonances induced by Ln-CDs, the guest versatility and supramolecular systems' reversibility, CODE-HD provides a switchable, polychromatic palette, as an advanced strategy for light-free, multicolor-mapping.

Date: 2021
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DOI: 10.1038/s41467-021-23179-9

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