Tuning the sensitization pathway T15DJ in Eu-based MOF through modification of the antenna ligand. A theoretical approach via multiconfigurational quantum calculations

Yoan Hidalgo-Rosa, Julián Santoyo-Flores, Manuel A. Treto-Suárez, Eduardo Schott, Dayán Páez-Hernández, Ximena Zarate

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

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 T15DJ (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 mechanical tool to guide the development of novel luminescent lanthanide-based MOFs.

Original languageEnglish
Article number119896
JournalJournal of Luminescence
Volume260
DOIs
Publication statusPublished - Aug 2023

Keywords

  • CASSCF
  • Luminescence sensitization
  • Organic ligands

ASJC Scopus subject areas

  • Biophysics
  • Atomic and Molecular Physics, and Optics
  • General Chemistry
  • Biochemistry
  • Condensed Matter Physics

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