Stimuli-Mediated Structural Interchange Between Pd6 and Pd12 Architectures: Selective Recognition of E-Stilbene by the Pd6 Architecture and its Photoprotection

Aggarwal, M and Banerjee, R and Hickey, N and Mukherjee, PS (2024) Stimuli-Mediated Structural Interchange Between Pd6 and Pd12 Architectures: Selective Recognition of E-Stilbene by the Pd6 Architecture and its Photoprotection. In: Angewandte Chemie - International Edition .

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Abstract

The dynamic behaviour of metal-ligand bonding cultivates stimuli-mediated structural transformations in self-assembled molecular architectures. The propensity of synthetically designed self-assembled systems to interchange between higher-order architectures is increased multi-fold when the building blocks have higher conformational degrees of freedom. Herein, we report a new ligand, (2,7-bis(di(pyridin-4-yl)amino)-9H-fluoren-9-one) (L), which, upon self-assembly with a cis-(ethylene-1,2-diamine)Pd(NO3)2 acceptor (M), resulted in the formation of a M6L3 trifacial barrel (C1) in water. Interestingly, during crystallization, a rare M12L6 triangular orthobicupola architecture (C2) was generated along with C1. C2 could also be generated in solution via the application of several stimuli. C1 in aqueous media could stabilize one trans-stilbene (tS) or cis-stilbene (cS) molecule in its cavity, with a selectivity for the former from their mixture. Moreover, C1 acted as an effective host to prevent the otherwise facile photoisomerization of tS to cS inside its hydrophobic cavity under UV irradiation. Conversely, the visible-light-induced reverse isomerization of encapsulated cS to encapsulated tS could be achieved readily due to the better stabilization of tS within the cavity of C1 and its transparency to visible light. A multi-functional system was therefore designed, which at the same time is stimuli-responsive, shows isomer selectivity, and photo-protects trans-stilbene. © 2024 Wiley-VCH GmbH.

Item Type:	Journal Article
Publication:	Angewandte Chemie - International Edition
Publisher:	John Wiley and Sons Inc
Additional Information:	The copyright for this article belongs to publisher.
Keywords:	Architecture; Isomers; Photoisomerization; Self assembly, Cis-stilbene; Coordination cage; Hostguest chemistry; Photoprotection; Responsive behaviour; Selective recognition; Stimuli-responsive; Stimulus-responsive behavior; Structural transformation; Trans-stilbene, Ligands
Department/Centre:	Division of Chemical Sciences > Inorganic & Physical Chemistry
Date Deposited:	09 Nov 2024 17:48
Last Modified:	09 Nov 2024 17:48
URI:	http://eprints.iisc.ac.in/id/eprint/86672

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