Spectroscopic Investigation of Bianthryl-Based Metal–Organic Framework Thin Films and Their Photoinduced Topotactic Transformation
Mohammed Hassan, Z. / Weidler, P. G. / Nefedov, A. / Luo, Y. / Heißler, S. / Tsotsalas, M. / Haldar, R. / Wöll, C. (2022)
ADVANCED MATERIALS INTERFACES, 2022, 9, 13, 2102441
- Date: Mai 2022
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.