| Autor: |
Henkelis SE; Nanoscale Sciences Department, Sandia National Laboratories, Albuquerque, New Mexico 87185, United States., Rademacher D; Nanoscale Sciences Department, Sandia National Laboratories, Albuquerque, New Mexico 87185, United States., Vogel DJ; Nanoscale Sciences Department, Sandia National Laboratories, Albuquerque, New Mexico 87185, United States., Valdez NR; Materials Characterization and Performance Department, Sandia National Laboratories, Albuquerque, New Mexico 87185, United States., Rodriguez MA; Materials Characterization and Performance Department, Sandia National Laboratories, Albuquerque, New Mexico 87185, United States., Rohwer LES; Microsystems Integration Department, Sandia National Laboratories, Albuquerque, New Mexico 87185, United States., Nenoff TM; Material, Physical, and Chemical Sciences Center, Sandia National Laboratories, Albuquerque, New Mexico 87185, United States. |
| Abstrakt: |
A novel metal-organic framework (MOF), Mn-DOBDC, has been synthesized in an effort to investigate the role of both the metal center and presence of free linker hydroxyls on the luminescent properties of DOBDC (2,5-dihydroxyterephthalic acid) containing MOFs. Co-MOF-74, RE-DOBDC (RE-Eu and Tb), and Mn-DOBDC have been synthesized and analyzed by powder X-ray diffraction (PXRD) and the fluorescent properties probed by UV-Vis spectroscopy and density functional theory (DFT). Mn-DOBDC has been synthesized by a new method involving a concurrent facile reflux synthesis and slow crystallization, resulting in yellow single crystals in monoclinic space group C 2/ c . Mn-DOBDC was further analyzed by single-crystal X-ray diffraction (SCXRD), scanning electron microscopy-energy-dispersive spectroscopy (SEM-EDS), and photoluminescent emission. Results indicate that the luminescent properties of the DOBDC linker are transferred to the three-dimensional structures of both the RE-DOBDC and Mn-DOBDC, which contain free hydroxyls on the linker. In Co-MOF-74 however, luminescence is quenched in the solid state due to binding of the phenolic hydroxyls within the MOF structure. Mn-DOBDC exhibits a ligand-based tunable emission that can be controlled in solution by the use of different solvents. |
