Mainz 2017 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 31: Poster: Quantum Optics and Photonics I

Q 31.94: Poster

Tuesday, March 7, 2017, 17:00–19:00, P OG1+2

Loading Chromophores into Thin Film Metal Organic Frameworks: Guest-Born Carboxylic Groups Facilitate Dye Incorporation. — •Nicolò Baroni¹, Andrey Turshatov¹, Michael Oldenburg¹, Michael Adams¹, Alexander Welle², Engelbert Redel², Christof Wöll², Bryce S. Richards^1,3, and Ian A. Howard¹ — ¹IMT, KIT, Eggenstein-Leopoldshafen — ²IFG, KIT, Eggenstein-Leopoldshafen — ³LTI, KIT, Karlsruhe

Imparting optoelectronic function to surface-anchored metal-organic framework (SURMOF) thin films by loading guest molecules into their porous structures expands the portfolio of applications for which these materials are relevant. In this study, we examine the loading behavior of porphyrin dyes in the SURMOF-2 structures based on Zn metal centers and 1,4-benzenedicarboxylate linkers. Loading is attempted for porphyrin dyes metallated with Pd, Pt, and Zn. For each metalation, the loading behavior of dyes with and without carboxylic pendant groups is compared. The loading procedure is a simple drop-casting, followed by rinse after drying to remove surface-deposited dyes. Using time of flight second ion mass spectroscopy, we demonstrate that the dyes with carboxylic pendant groups penetrate through the whole SURMOF film. We also present a study of the optical properties of the SURMOFs incorporating the guest porphyrin dyes. Examining the steadystate, timeresolved, absorption and emission properties of the system, we find that the guest molecules can interact within the pores leading aggregate behavior to dominate the optical properties. Also,a longlived emission from the unloaded SURMOF itself is observed.