TY - JOUR
T1 - Solid state photoluminescence studies of [EuLnH2(NO3)3](H2O)x macrocyclic complexes with Schiff base ligands
AU - de Santana, Ricardo C.
AU - Fuentealba, Pablo A.
AU - Maia, Lauro J.Q.
AU - Paredes-García, Verónica
AU - Aravena, Daniel
AU - Venegas-Yazigi, Diego
AU - Manzur, Jorge
AU - Spodine, Evgenia
N1 - Funding Information:
The authors thank Proyecto FONDECYT 1160106 and Proyecto Anillo CONICYT ACT 1404 grants for financial support. ESS, PFC, VPG, DVY are also members of CEDENNA, Financiamiento Basal, FB0807. PFC also thanks FONDECYT for postdoctoral grant 3170186. The authors also acknowledge CNPq and FAPEG in Brazil. Powered@NLHPC: This research was partially supported by the supercomputing infrastructure of the NLHPC (ECM-02).
Funding Information:
The authors thank Proyecto FONDECYT 1160106 and Proyecto Anillo CONICYT ACT 1404 grants for financial support. ESS, PFC, VPG, DVY are also members of CEDENNA, Financiamiento Basal, FB0807. PFC also thanks FONDECYT for postdoctoral grant 3170186 . The authors also acknowledge CNPq and FAPEG in Brazil. Powered@NLHPC: This research was partially supported by the supercomputing infrastructure of the NLHPC (ECM - 02).
Publisher Copyright:
© 2018 Elsevier B.V.
PY - 2018/11/1
Y1 - 2018/11/1
N2 - Three EuIII macrocyclic complexes [EuLnH2(NO3)3](H2O)x based on the ligands derived from 2-hydroxy-5-methyl-1,3-benzenedicarbaldehyde and three different amines: o-phenylenediamine, Eu-OPDA; ethylenediamine, Eu-EDA; and 1,3-diaminopropane, Eu-DAP have been synthesized via a metal template reaction. Eu-EDA and Eu-DAP showed metal based emission; for the Eu-OPDA complex these luminescent properties were not observed. From the photoluminescence emission measurements from ~13 to 300 K, the R/O = I (5D0 → 7F2)/I (5D0 → 7F1) ratio, together with two intensity parameters (Ω2 and Ω4), radiative lifetimes (τR) and branching ratios (β0 J′) were calculated based on the Judd-Ofelt theory, for Eu-EDA and Eu-DAP. While the behavior of these parameters for the Eu-DAP complex is temperature dependent, these remain constant for Eu-EDA. The temperature dependence observed for the Eu-DAP complex indicates that for temperatures below 120 K, the local symmetry of the EuIII center is modified, as compared to the environment of the same metal center at room temperature.
AB - Three EuIII macrocyclic complexes [EuLnH2(NO3)3](H2O)x based on the ligands derived from 2-hydroxy-5-methyl-1,3-benzenedicarbaldehyde and three different amines: o-phenylenediamine, Eu-OPDA; ethylenediamine, Eu-EDA; and 1,3-diaminopropane, Eu-DAP have been synthesized via a metal template reaction. Eu-EDA and Eu-DAP showed metal based emission; for the Eu-OPDA complex these luminescent properties were not observed. From the photoluminescence emission measurements from ~13 to 300 K, the R/O = I (5D0 → 7F2)/I (5D0 → 7F1) ratio, together with two intensity parameters (Ω2 and Ω4), radiative lifetimes (τR) and branching ratios (β0 J′) were calculated based on the Judd-Ofelt theory, for Eu-EDA and Eu-DAP. While the behavior of these parameters for the Eu-DAP complex is temperature dependent, these remain constant for Eu-EDA. The temperature dependence observed for the Eu-DAP complex indicates that for temperatures below 120 K, the local symmetry of the EuIII center is modified, as compared to the environment of the same metal center at room temperature.
KW - Eu complexes
KW - Judd-Ofelt parameters
KW - Luminescence
KW - Macrocyclic ligands
UR - http://www.scopus.com/inward/record.url?scp=85048473530&partnerID=8YFLogxK
U2 - 10.1016/j.jlumin.2018.06.022
DO - 10.1016/j.jlumin.2018.06.022
M3 - Article
AN - SCOPUS:85048473530
SN - 0022-2313
VL - 203
SP - 7
EP - 15
JO - Journal of Luminescence
JF - Journal of Luminescence
ER -