Structural and optical properties of praseodymium ions post-functionalized metal-organic framework
Abstract
The aim of this work is to synthesise a new class of lanthanide metal organic framework. A three dimensional (3D) framework of aluminium Pyromellitate (MIL-121) or (Al(OH) (H2btec).H2O), (H4btec=Pyromellitic acid) is used as metal organic framework. The uncoordinated carbonyl groups in the aluminium Pyromellitate (MIL-121) make it a very good candidate to bind with Pr3+ ions. As a result, a new type of lanthanide MOFs is obtained by inserting Pr3+ into metal organic framework crystals. Traditional techniques such as x-ray diffraction (XRD), FTIR, UV-visible spectroscopy and photoluminescence spectroscopy are used to characterize of the samples. XRD data analysis confirmed the single phase nature with monoclinic crystal symmetry and the average crystallite size decreases with the doping of Pr+3 ions. XRD patterns also confirmed that, Pr3+ ions are located in the channels of MIL-121 not on its framework. FTIR analysis confirmed the purity and the formation of MIL-121. Optical band gap is determined using Tauc's relation, is found to decrease after binding to Pr3+ ions. Photoluminescence spectra recorded in emission mode, exhibit an increase in intensity on Pr3+ binding.
- Publication:
-
American Institute of Physics Conference Series
- Pub Date:
- May 2020
- DOI:
- 10.1063/5.0001667
- Bibcode:
- 2020AIPC.2220g0001A