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FM: Fachverband Funktionsmaterialien

FM 15: Nanoscale Probing of Functional Properties

FM 15.2: Vortrag

Mittwoch, 11. März 2026, 15:15–15:30, BEY/0E40

Photoluminescence Spectroscopy of Platinum (II) and Palladium (II) Dimers in Organic Molecular Single Crystals Under Pressure — Paul Steeger¹, Tobias Theiss², Dominik Schwab³, Ivan Maisuls², •Vedhanth Senthiappan Vellaiappan Uthayasurian¹, Robert Schmidt¹, Ilya Kupenko⁴, Carmen Sanchez Valle⁴, Steffen Michaelis de Vasconcellos¹, Nikos L. Doltsinis³, Cristian A. Strassert², and Rudolf Bratschitsch¹ — ¹Institute of Physics, University of Münster — ²Institut für Anorganische und Analytische Chemie, University of Münster — ³Institute of Solid State Theory, University of Münster — ⁴Institute of Mineralogy, University of Münster

Cyclometalated transition-metal complexes are promising for applications ranging from bioimaging to light-emitting diodes. We investigate two tailored biscyclometalated Pd(II) and Pt(II) complexes, which feature ligands that promote head-to-tail dimer formation to enable interactions between their metal centers [1]. We prepare molecular single crystals and apply hydrostatic pressure with a diamond anvil cell in the GPa range [2]. The photoluminescence shows a prominent redshift under pressure. Density functional theory calculations link this effect to a reduced metal-metal distance. Importantly, the observed mechanochromism is reversible, which holds the promise for pressure sensing and optical storage applications. References: [1] T. Theiss et al., J. Am. Chem. Soc. 145, 3937 (2023), [2] P. Steeger et al., Nano Lett. 25, 2628 (2025)

Keywords: High Pressure Experiment; Photoluminescence Spectroscopy; Transition Metal Complexes; Diamond Anvil Cell; Molecular Single Crystal