Issue 33, 2024

Unveiling MOF-808 photocycle and its interaction with luminescent guests

Abstract

The world of metal–organic frameworks (MOFs) has become a hot topic in recent years due to the extreme variety and tunability of their structures. There is evidence of MOFs that exhibit intrinsic luminescence properties that arise directly from their organic components or from the interaction between them and metallic counterparts. A new perspective is to exploit the porous nature of MOFs by encapsulating luminescent guests, such as organic dyes, in order to explore possible changes in the luminescence activity of the combined systems. This work is focused on the optical study of zirconium-based MOF-808 and its interaction with encapsulated rhodamine B molecules. Using a plethora of different techniques, we were able to unravel its photocycle. MOF-808 displays intrinsic luminescence activity that derives from an energy transfer process from the linker to the metal sites occurring in 300 ps. The emission is a singlet–singlet transition in aqueous solution, and it is a triplet transition in powdered form. After exploring the bare MOF, we combined it with rhodamine B molecules, following an easy post-synthetic process. Rhodamine B molecules were found to be encapsulated in MOF pores and interact with the MOF's matrix through nanosecond energy transfer. We created a totally new dual-emitting system and suggested a way, based on the time-resolved studies, to clearly unravel the photocycle of MOFs from the very first photoexcitation.

Graphical abstract: Unveiling MOF-808 photocycle and its interaction with luminescent guests

Supplementary files

Article information

Article type
Paper
Submitted
04 Jun 2024
Accepted
28 Jul 2024
First published
05 Aug 2024

Phys. Chem. Chem. Phys., 2024,26, 22269-22277

Unveiling MOF-808 photocycle and its interaction with luminescent guests

G. Ficarra, A. Sciortino, L. G. Barbata, R. Ettlinger, V. De Michele, E. Marin, M. Cannas, R. E. Morris and G. Buscarino, Phys. Chem. Chem. Phys., 2024, 26, 22269 DOI: 10.1039/D4CP02279C

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