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Issue 10, 2020
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Tracking the light-induced isomerization processes and the photostability of spiropyrans embedded in the pores of crystalline nanoporous MOFs via IR spectroscopy

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Abstract

The embedment of photochromic dyes into porous host matrices has attracted increasing interest in recent years. Especially the class of spiropyrans has been considered because of its outstanding photochromic and solvatochromic response. We herein present a comprehensive infrared spectroscopic characterization of the photoresponse and photostability of a nitro-substituted spiropyran “SP-Nitro” (namely 1,3,3-trimethylindolino-6′-nitrobenzopyrylospiran) non-covalently attached to different crystalline nanoporous MOF (metal–organic framework) host lattices. The TTC mesomeric form of SP-Nitro has been found to be preferably generated upon UV light exposure inside the different MOF hosts. Additionally, the excited isomer was found to be stable for prolonged irradiation times of 1–1.5 h.

Graphical abstract: Tracking the light-induced isomerization processes and the photostability of spiropyrans embedded in the pores of crystalline nanoporous MOFs via IR spectroscopy

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Article information


Submitted
10 Aug 2020
Accepted
22 Sep 2020
First published
23 Sep 2020

Photochem. Photobiol. Sci., 2020,19, 1433-1441
Article type
Paper

Tracking the light-induced isomerization processes and the photostability of spiropyrans embedded in the pores of crystalline nanoporous MOFs via IR spectroscopy

H. A. Schwartz, D. Schaniel and U. Ruschewitz, Photochem. Photobiol. Sci., 2020, 19, 1433
DOI: 10.1039/D0PP00267D

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