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

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...

A photoprogrammable electronic nose with switchable selectivity for VOCs using MOF films

“…We are convinced that such photoprogrammable active sensing materials can also be applied in other sensor setups, in particular in applications where MOFs are already found. 23,24,78,79 While the focus of our work has been on azobenzenes, the concept can also be applied to MOF lms with other photoresponsive groups such as spiropyrans, 80,81 diarylethenes 82,83 or fulgides. 84 In addition to reversible photoisomerization, irreversible light-induced processes in MOFs can also be used.…”

Efficient solid-state photoswitching of methoxyazobenzene in a metal–organic framework for thermal energy storage

“…Using this approach, solid-state photoswitching has been demonstrated for AB derivatives [13][14][15][16][17][18][19][20][21][22] as well as other molecules including dithienylethenes, [23][24][25][26][27] 2-phenylazopyridine, 28 and spiropyrans. [29][30][31][32][33][34][35] In addition to spatial considerations, another requirement for solid-state MOST materials is to ensure a high degree of photoconversion to the metastable state. For AB, overlap of the p-p* absorption bands for the E and Z isomers means that the photostationary state (PSS) is limited to approximately 78% Z isomer under 365 nm irradiation.…”

“…Using this approach, solid-state photoswitching has been demonstrated for AB derivatives 13–22 as well as other molecules including dithienylethenes, 23–27 2-phenylazopyridine, 28 and spiropyrans. 29–35…”

Photoswitchable Zirconium MOF for Light-Driven Hydrogen Storage

“…Visible light initiates a reverse process [16]. Generally, DAE molecules can be incorporated into the MOF scaffold in two ways: as parts of linker molecules [17][18][19] or as guests in the pores [20,21].…”