TY - JOUR

T1 - Luminescent properties of Ln(III) complexes with 2-[(phenylamino)methylene]-5,5-dimethyl-cyclohexane-1,3-dione as an antenna

AU - Smirnova, K. S.

AU - Ivanova, E. A.

AU - Sukhikh, T. S.

AU - Pozdnyakov, I. P.

AU - Dotsenko, V. V.

AU - Lider, E. V.

N1 - Funding Information: This work was supported by the Russian Science Foundation (Project № 20-73-10207). The authors thank to workers from Nikolaev Institute of Inorganic Chemistry, namely Anna P. Zubareva for the elemental analysis, Liliya A. Sheludyakova for the IR spectroscopy data, Ilya V. Korolkov for the X-ray phase analysis data, Alexey S. Berezin for quantum yields measurements and Marianna I. Rakhmanova for phosphorescence measurements. Funding Information: This work was supported by the Russian Science Foundation (Project № 20-73-10207). Publisher Copyright: © 2021 Elsevier B.V. Copyright: Copyright 2021 Elsevier B.V., All rights reserved.

PY - 2021/9/24

Y1 - 2021/9/24

N2 - Seven lanthanide-based coordination compounds with 2-[(phenylamino)methylene]-5,5-dimethyl-cyclohexane-1,3-dione were synthesized: [Eu(HL)2(NO3)3] (1), [Sm(HL)2(NO3)3] (2), [Ce(HL)2(NO3)3] (3), [Tm(HL)2Cl3]·H2O (4), [Tb(HL)2Cl3]·H2O (5), [Dy(HL)2(H2O)(NO3)3] (6) and [Gd(HL)2Cl3]·H2O (7). The obtained Eu(III), Sm(III) and Ce(III) nitrate complexes was established to be isostructural just like Tm(III), Tb(III) and Gd(III) chloride ones. Using X-ray diffraction analysis, the structures of cerium and samarium were determined, which occurred to be polymer chains. On the contrary, the dysprosium compound was mononuclear. Ligand was shown to emit in blue region with quantum yield near 12%. For lanthanide complexes of Eu(III), Sm(III), and Tb(III), during the energy transfer from the ligand triplet state to the central atom, characteristic bands of the metal ion are observed in the emission spectra. The lifetimes and quantum yields of luminescence for these complexes were also determined. For other compounds, no energy transfer is observed due to lower energy of ligand triplet state than corresponding emitting state of the lanthanide ions.

AB - Seven lanthanide-based coordination compounds with 2-[(phenylamino)methylene]-5,5-dimethyl-cyclohexane-1,3-dione were synthesized: [Eu(HL)2(NO3)3] (1), [Sm(HL)2(NO3)3] (2), [Ce(HL)2(NO3)3] (3), [Tm(HL)2Cl3]·H2O (4), [Tb(HL)2Cl3]·H2O (5), [Dy(HL)2(H2O)(NO3)3] (6) and [Gd(HL)2Cl3]·H2O (7). The obtained Eu(III), Sm(III) and Ce(III) nitrate complexes was established to be isostructural just like Tm(III), Tb(III) and Gd(III) chloride ones. Using X-ray diffraction analysis, the structures of cerium and samarium were determined, which occurred to be polymer chains. On the contrary, the dysprosium compound was mononuclear. Ligand was shown to emit in blue region with quantum yield near 12%. For lanthanide complexes of Eu(III), Sm(III), and Tb(III), during the energy transfer from the ligand triplet state to the central atom, characteristic bands of the metal ion are observed in the emission spectra. The lifetimes and quantum yields of luminescence for these complexes were also determined. For other compounds, no energy transfer is observed due to lower energy of ligand triplet state than corresponding emitting state of the lanthanide ions.

KW - Crystal structures

KW - Enaminone

KW - Lanthanide complexes

KW - Photoluminescence

KW - β-Diketonate

UR - http://www.scopus.com/inward/record.url?scp=85107748477&partnerID=8YFLogxK

U2 - 10.1016/j.ica.2021.120490

DO - 10.1016/j.ica.2021.120490

M3 - Article

AN - SCOPUS:85107748477

VL - 525

JO - Inorganica Chimica Acta

JF - Inorganica Chimica Acta

SN - 0020-1693

M1 - 120490

ER -