Conductance Photoswitching of Metal–Organic Frameworks with Embedded Spiropyran

Photoswitching: Metal–organic framework films were loaded with spiropyran, which photoisomerizes under UV light irradiation to the merocyanine form with a larger conjugated electron system. This isomerization results in a remote‐controlled reversible modification of the material conductance by one order of magnitude.

Abstract

Conductive metal–organic frameworks (MOFs) as well as smart, stimuli‐responsive MOF materials have attracted considerable attention with respect to advanced applications in energy harvesting and storage as well as in signal processing. Here, the conductance of MOF films of type UiO‐67 with embedded photoswitchable nitro‐substituted spiropyrans was investigated. Under UV irradiation, the spiropyran (SP) reversibly isomerizes to the open merocyanine (MC) form, a zwitterionic molecule with an extended conjugated π‐system. The light‐induced SP–MC isomerization allows for remote control over the conductance of the SP@UiO‐67 MOF film, and the conductance can be increased by one order of magnitude. This research has the potential to contribute to the development of a new generation of photoelectronic devices based on smart hybrid materials.

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