Functional materials (e) (f) (g) S. Klokic1, B. Marmiroli2, G. Birarda3, F. Lackner4, P.Holzer2, B. Sartori2, B. Abbasgholi-NA5, S.Dal Zilio5, R. Kargl4, K. S. Kleinschek4, C. Stani1, L. Vaccari3, H. Amenitsch2 1 CERIC-ERIC, Trieste, Italy 2 Institute of Inorganic Chemistry, Graz University of Technology, Graz, Austria 3 Elettra - Sincrotrone Trieste S.C.p.A., Trieste, Italy 4 Institute of Chemistry and Technology of Bio-Based Systems, Graz University of Technology, Graz, Austria 5 CNR-IOM, TASC Laboratory, Trieste, Italy e-mail: sumea.klokic@elettra.eu; heinz.amentisch@tugraz.at Acknowledgments This study was carried out in the frame of the INCITE project, funded by CERIC-ERIC consortium. The authors want to thank CERICERIC for the access to the facilities. In particular, S.K. is very grateful to CERIC-ERIC for the postdoctoral position granted through this internal project. Data at the SAXS and SISSI beamlines were collected both during the experiments 20232161 and 20222149. Original paper S. Klokic et al., Nat. Commun. 16, 7135 (2025), DOI: 10.1038/s41467-025-60027-6. Fig. 1 Figure 1. Device schematics to track low-pressure CO2 uptake and release. (a) Grazing-Incidence Wide-Angle X-ray Scattering (GIWAXS) setup to monitor crystallographic changes in Zn-MOF films during CO₂ uptake/release. (b) IR-spectromicroscopy for observing CO₂ ad-/desorption under mild conditions. (c) Quartz crystal microbalance with dissipation (QCM-D) using a custom-built measurement cell with integrated LEDs for photo-switching studies and CO₂ quantification. (d) Schematic of heteroepitaxial growth of Zn₂L₂DABCO films with two crystallographic planes aligning in-plane (orange) and out-of-plane (green), parallel to the substrate. Two planes align in-plane (orange) and out-of-plane (green highlighted area). (e) GIWAXS data of Zn₂MeBDC₂DABCO films (L = Me-BDC) during CO₂ uptake/release (295 K), showing expansion along the (100)OP reflection, while (001)IP remains unchanged. (f) Photo-triggered CO₂ uptake/release cycles tracked via relative CO₂ mass changes under 365 nm and 450 nm irradiation. (g) Zn₂Me-BDC₂DABCO/AB before (solid line) and during (dotted line) CO₂ loading, showing vibrational modes of azobenzene (vAB) and adsorbed CO₂ (vCO₂-ad). Elettra Highlights 2024–2025 27
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