Shedding Light on Eu(III) β‐Diketonate Compounds with 1,2‐Bis(diphenylphosphino)ethane Oxide Ligand: an Optical Study

Author:

Santos Paulo R. S.1,Jesus Ashley A. S. S.1,Lima William B.1,Arruda Joaldo G.1ORCID,Faustino Wagner M.1,Felinto Maria C. F. C.2,Sabino José R.3,Brito Hermi F.4,Costa Israel F.4,Moura Renaldo T.5,Carneiro Neto Albano N.6,Malta Oscar L.7,Terraschke Huayna8,Teotonio Ercules E. S.1ORCID

Affiliation:

1. Departamento de Química Universidade Federal da Paraíba 58051-970 João Pessoa PB Brasil

2. Instituto de Pesquisas Energéticas e Nucleares-IPEN/CNEN São Paulo SP, 05508-000 Brasil

3. Instituto de Física – Universidade Federal de Goiás 74690-900 Goiânia GO Brasil

4. Instituto de Química Universidade de São Paulo 05508-900 São Paulo SP Brasil

5. Departmento de Química e Física Universidade Federal da Paraíba Areia PB, 58397-000 Brasil

6. Physics Department and CICECO – Aveiro Institute of Materials University of Aveiro Aveiro 3810-193 Portugal

7. Departamento de Química Fundamental Universidade Federal de Pernambuco Recife PE-50740-560 Brazil

8. Institute of Inorganic Chemistry Christian-Albrechts-Universität zu Kiel Max-Eyth-Str. 2 24118 Kiel Germany

Abstract

AbstractA series of novel lanthanide β‐diketonate coordination compounds containing the ancillary ligand bis(diphenylphosphino) oxide (dppeO2) have been synthesized, characterized, and studied spectroscopically. The compounds of formulas Ln(β‐dik)3(dppeO2), where Ln: Eu and Gd and β‐dik ligands as tta (Ln‐1), btf (Ln‐2), bzac (Ln‐5) and tfac (Ln‐4), and Ln2(β‐dik)6(dppeO2) with ligand dbm (Ln‐3) and fod (Ln‐6). Their photophysical properties were investigated from the Judd‐Ofelt intensity parameters ( ), radiative ( ) and non‐radiative ( ) rates, intrinsic ( ) and overall ( ) quantum yields, and CIE (x,y) color coordinates. The Eu‐5 and Eu‐6 compounds have the first excited triplet states T1 (around 18802 and 18976 cm−1, respectively) almost resonant with the Eu3+ 5D0 emission level, whereas the complexes Eu‐1, Eu‐2, Eu‐3, and Eu‐4 exhibited higher T1 energies. The values were predominantly driven by the intensity parameter , suggesting more pronounced angular changes in the first coordination sphere of the Eu3+ ion. The values also exhibited significant changes with the β‐diketonate ligands. Eu‐1 showed the highest value of (60 %), indicating a more efficient intramolecular energy transfer process. On the other hand, Eu‐5 and Eu‐6 compounds showed values equal to 18.7 % and 16.5 %, respectively, which indicates the presence of luminescence quencher channels.

Publisher

Wiley

Subject

Inorganic Chemistry

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