Energy Transfer Dynamics in Metal-Organic Frameworks

Journal Article · Wed Sep 22 04:00:00 EDT 2010 · Journal of the American Chemical Society

DOI:https://doi.org/10.1021/ja102804s· OSTI ID:1385333

Kent, Caleb A.; Mehl, Brian P.; Ma, Liqing; Papanikolas, John M.; Meyer, Thomas J.; Lin, Wenbin

Isomorphous metal-organic frameworks (MOFs) based on {M[4,4'-(HO2C)2-bpy]2bpy}2+ building blocks (where M = Ru or Os) were designed and synthesized to study the classic Ru to Os energy transfer process that has potential applications in light-harvesting with supramolecular assemblies. The crystalline nature of the MOFs allows precise determination of the distances between metal centers by X-ray diffraction, thereby facilitating the study of the Ru→Os energy transfer process. The mixed-metal MOFs with 0.3, 0.6, 1.4, and 2.6 mol % Os doping were also synthesized in order to study the energy transfer dynamics with a two-photon excitation at 850 nm. The Ru lifetime at 620 nm decreases from 171 ns in the pure Ru MOF to 29 ns in the sample with 2.6 mol % Os doping. In the mixed-metal samples, energy transfer was observed with an initial growth in Os emission corresponding with the rate of decay of the Ru excited state. These results demonstrate rapid, efficient energy migration and long distance transfer in isomorphous MOFs.

• Research Organization: Energy Frontier Research Centers (EFRC) (United States). Center for Solar Fuels (UNC EFRC)
• Sponsoring Organization: USDOE SC Office of Basic Energy Sciences (SC-22)
• DOE Contract Number: SC0001011
• OSTI ID: 1385333
• Journal Information: Journal of the American Chemical Society, Journal Name: Journal of the American Chemical Society Journal Issue: 37 Vol. 132; ISSN 0002-7863
• Publisher: American Chemical Society (ACS)
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
catalysis (heterogeneous)
catalysis (homogeneous)
charge transport
electrodes - solar
hydrogen and fuel cells
materials and chemistry by design
photosynthesis (natural and artificial)
solar (fuels)
solar (photovoltaic)
synthesis (novel materials)
synthesis (self-assembly)