Novel Photoactive Spirooxazine Based Switch@MOF Composite Materials.

Schwartz, Heidi A.; Werker, Melanie; Tobeck, Christian; Christoffels, Ronja; Schaniel, Dominik; Olthof, Selina; Meerholz, Klaus; Kopacka, Holger; Huppertz, Hubert; Ruschewitz, Uwe

Molecules, which reversibly transform between two structural configurations upon excitation with electromagnetic radiation, are attractive candidates for the design of smart materials e. g. memory devices. A possible approach for the development of such smart materials is the construction of hybrid systems that contain these photochromic molecules as well as a porous host matrix, which enables their switching process in the solid state. We herein present the first light‐responsive materials consisting of the photoswitchable spirooxazine 1,3,3‐trimethyl indolinonaphthospirooxazine (SP−O) and crystalline porous MOF (metal–organic framework) hosts, namely MOF‐5, MIL‐68(In), MIL‐68(Ga), and MIL‐53(Al), which were combined to form hybrid SP−O@MOF composites. These systems show a reversible photochromic response and host‐dependent absorption maxima of the incorporated guest molecules. Most remarkably, SP−O is extremely photostable upon repetitive and prolonged UV light exposure especially inside MOF‐5, making these composite materials attractive candidates for potential applications in data storage devices.

COMPOSITE materials; PHOTOCHROMIC materials; SMART materials; COMPUTER storage devices; POROUS metals; METAL-organic frameworks; ELECTROMAGNETIC radiation

ChemPhotoChem, 2020, Vol 4, Issue 3, p195

2367-0932

Academic Journal

10.1002/cptc.201900193