Photoluminescence properties of new dinuclear [Eu(μ2-OC2H5)(btfa)(NO3)(phen)]2phen and mononuclear Eu(TTA)3(Ph3PO)2 complexes

V. I. Verlan; I. P. Culeac; Olga Bordian; M. S. Iovu; A. I. Bulhac; V. E. Zubareva; Alina Semchenko

doi:10.1117/12.2644859

2 March 2023 Photoluminescence properties of new dinuclear [Eu(μ₂-OC₂H₅)(btfa)(NO₃)(phen)]₂phen and mononuclear Eu(TTA)₃(Ph₃PO)₂ complexes

V. I. Verlan, I. P. Culeac, Olga Bordian, M. S. Iovu, A. I. Bulhac, V. E. Zubareva, Alina Semchenko

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Proceedings Volume 12493, Advanced Topics in Optoelectronics, Microelectronics, and Nanotechnologies XI; 1249305 (2023) https://doi.org/10.1117/12.2644859
Event: Advanced Topics in Optoelectronics, Microelectronics and Nanotechnologies 2022, 2022, Constanta, Romania

Abstract

A new dinuclear complex Europium(III) bis[(μ2-ethoxy)(benzoyl trifluoroacetonato)(nitrate) (1,10-phenanthroline) europium(III)]2 1,10-phenanthroline, here after [Eu(μ2-OC₂H₅)(btfa)(NO₃)(phen)]₂·phen)(1) (Figure 1a) and the mononuclear complex Eu(TTA)₃(Ph₃PO)₂(2) (Figure 2a) were synthesized and characterized by photoluminescence (PL) spectroscopy. The PL emission spectra of the powder samples of the compounds were recorded in the temperature range 10.7 – 300 K. Both complexes show rare metal-centered luminescence in the energy range characteristic of the Eu³⁺ ion (580 – 710 nm) with emission bands according to ion selection rule. The emission bands in the PL are attributed to the internal 4f → 4f radiative transitions of the Eu³⁺ ion ⁵D₀ → ⁷Fi (i = 0→4) and, in addition, to the splitting of each level caused by the influence of the electric field of the ligands of the complex. Due to the splittings, each level is divided into 2i+1 sublevels, which are well observed in the mononuclear compound 2 centered at 580, 595, 615, 650, and 698 nm. However, in the PL spectrum of the dinuclear compound, the splits show a double number of splits (2(2i + 1)), which indicates the presence of two positions of the Eu3+ ion in the molecule and which are not optically equivalent.

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V. I. Verlan, I. P. Culeac, Olga Bordian, M. S. Iovu, A. I. Bulhac, V. E. Zubareva, and Alina Semchenko "Photoluminescence properties of new dinuclear [Eu(μ₂-OC₂H₅)(btfa)(NO₃)(phen)]₂phen and mononuclear Eu(TTA)₃(Ph₃PO)₂ complexes", Proc. SPIE 12493, Advanced Topics in Optoelectronics, Microelectronics, and Nanotechnologies XI, 1249305 (2 March 2023); https://doi.org/10.1117/12.2644859

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