Hassan, Z.M.; Weidler, P.G.; Nefedov, A.; Luo, Y.; Heißler, S.; Tsotsalas, M.; Haldar, R.; Wöll, C.: Spectroscopic Investigation of Bianthryl-Based Metal-Organic Framework Thin Films and Their Photoinduced Topotactic Transformation. Advanced Materials Interfaces 9 (2022), p. 2102441/1-6
10.1002/admi.202102441
Open Access Version (externer Anbieter)
Abstract:
Metal–organic frameworks (MOFs) have gained a large amount of interest because of their periodic and modular structure. These features allow easy prediction of the physical and chemical properties of an organic chromophore, acting as a linker in the MOF. In the present work, a bianthryl (BA) chromophore, equipped with metal-coordinating carboxylate groups, is studied to construct a photoluminescent Zn-BA surface-anchored MOF (SURMOF) thin film. The Zn-BA SURMOF, in response to prolonged UV light irradiation under ambient conditions, exhibits prominent changes in the ground and excited state optical properties, without losing its crystalline structure. A detailed spectroscopic study using UV–vis, infra-red, Raman, and electron paramagnetic resonance (EPR) reveals that in the presence of O2 a photoinduced topotactic transformation is initiated by the formation of singlet oxygen, which then reacts with the BA linkers to form endoperoxide.