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Updated: May 23, 2025
Hyperspectral Imaging as a Tool to Study Optical Anisotropy in Lanthanide-Based Molecular Single Crystals
Published on: April 14, 2020
Experimental and theoretical photophysical study of new synthesized highly asymmetric nona-coordinated trivalent Sm
Shradha Verma1, Shabir Ahmad Bhat2, Najmul Hasan3
1Department of Physical Science, Rabindranath Tagore University, Bhopal, M.P., India.
Abstract:
The synthesis and characterizations of two new complexes, [Sm(btfa)3Cl-terp] (SmC45H28F9O6N3Cl) and [Eu(btfa)3Cl-terp] (EuC45H28F9O6N3Cl) were done successfully. The complexes have nona-coordinate Sm and Eu centres coordinated to six oxygen atoms of benzoyltrifluoro acetone (btfa) and three nitrogen atoms of chloro-terpyridine (Cl-terp). The ground state geometry of both complexes was optimized using the sparkle model and the shape analysis was carried out using SHAPE v2.1. The detailed photophysical properties of the complexes were studied in solution, solid and 5 % PMMA thin film. The emission spectra of the complexes are devoid of any ligand fluorescence that marks the utilized organic ligands as efficient sensitizers. The decay time and absolute quantum yield of the Sm complex show 12- and 7-fold increase than its precursor [Sm(btfa)3(H2O)2]. The longer decay time of 93 µs is higher than most of the reported trivalent samarium β-diketonate complexes. The Judd-Ofelt intensity parameters, radiative and non-radiative rate constants, intensity ratio, radiative and experimental lifetime, absolute as well as intrinsic quantum yield and sensitization efficiency were calculated and analysed for Eu complex. The decay time, absolute quantum yield and intrinsic quantum yield of [Eu(btfa)3Cl-terp] are 3-, 15- and 3-times larger than precursor, [Eu(btfa)3(H2O)2]. The energy transfer from organic sensitizers to europium ion and the contribution of individual sensitizers along with the luminescence branching ratio of emitting levels of Eu ion were investigated and analysed.
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