Tuning the sensitization pathway T1→5DJ in Eu-based MOF through modification of the antenna ligand. A theoretical approach via multiconfigurational quantum calculations
Abstract
The current study demonstrates the possibility of improving the efficiency of Eu3+ sensitization in an Eu-based MOF, labelled as EuL-R, by modifying the antenna ligand. The electronic structure of seven antenna ligand derivatives with the form R-4-(pyrimidin-5-yl) benzoic acid (L-R) ligand derivates was thoroughly examined in this research. Also, the most likely energy transfer channels for the sensitization pathway of Eu3+ ions in the EuL-R systems (R: CH3, -OH, -SH and -NH2) was studied. The efficiency in the intersystem crossing (ISC) process from S1 to T1 in the antenna make plausible a subsequent energy transfer to the emissive state in the Eu3+. This process was studied via multireference CASSCF/NEVPT2 calculations due to the multiconfigurational character of Eu3+ ions. Based on Latva and Reindhout's empirical rules, the 4-(2-(thiophen-2-yl)pyrimidin-5-yl)benzoic acid (L6) was chosen as efficient antenna for the sensitization process in this system. In conclusion, it was discovered that including the thiophenyl group at the L antenna (L6), increased the energy gaps S1 -> T1 and T1 -> 5DJ (Eu3+) to an optimal range for the ISC and subsequent energy transfer. Finally, a deeply understanding of the sensitization and emission mechanisms was possible from the excited-state dynamics analysis of the L6 antenna, via fluorescence, inter-system crossing (ISC), phosphorescence, and kF, kISC, and kP, rates calculations. This study therefore highlights the importance of a thorough theoretical procedure via a robust quantum me-chanical tool to guide the development of novel luminescent lanthanide-based MOFs.
Más información
Título según WOS: | ID WOS:000999125400001 Not found in local WOS DB |
Título según SCOPUS: | ID SCOPUS_ID:85154057614 Not found in local SCOPUS DB |
Título de la Revista: | JOURNAL OF LUMINESCENCE |
Volumen: | 260 |
Editorial: | Elsevier |
Fecha de publicación: | 2023 |
DOI: |
10.1016/J.JLUMIN.2023.119896 |
Notas: | ISI, SCOPUS |