TY - JOUR

T1 - Photophysical processes for phenanthroline-menthol ligand and its Eu(III) and Tb(III) complexes in solution

AU - Plyusnin, Victor F.

AU - Mikheylis, Aleksandr V.

AU - Kupryakov, Arkady S.

AU - Shubin, Aleksandr A.

AU - Grivin, Vyacheslav P.

AU - Bryleva, Julia A.

AU - Larionov, Stanislav V.

N1 - Publisher Copyright: © 2019 Elsevier B.V. Copyright: Copyright 2019 Elsevier B.V., All rights reserved.

PY - 2019/10/1

Y1 - 2019/10/1

N2 - Time resolved luminescence, nanosecond laser flash photolysis, and quantum chemical calculations were used to study the photophysical processes for new chiral ligand (L) containing phenanthroline (Phen) and menthol moiety and EuL2(NO3)3 and TbL2(NO3)3 complexes. The absorption and luminescence spectra of free L in acetonitrile are shifted to the red at 10 nm with respect to Phen. The lifetime and quantum yield of luminescence of L are significantly increased (τ = 2.5 ns φf = 0.059) as compared with Phen (τ = 0.51 ns φf = 0.0087 [1]). As a result of intersystem crossing (ISC) ligand L goes to the triplet state (quantum yield φT = 0.092). The triplet-triplet absorption spectrum of L is a broad band with maximum at 450 nm. The protonation of L leads to the appearance of LH+ form which has a broad luminescence band with a maximum at 482 nm and a lifetime of 38 ns. The EuL2(NO3)3 complex exists in solution at a high concentration and exhibits a characteristic red luminescence. However, as the concentration of EuL2(NO3)3 decreases, the complex dissociates and the bands of free L ligand and protonated LH+ form appear in the absorption and luminescence spectra. Quantum-chemical calculations allow to calculate the geometry and absorption spectra of free and protonated ligands and EuL2(NO3)3 complex.

AB - Time resolved luminescence, nanosecond laser flash photolysis, and quantum chemical calculations were used to study the photophysical processes for new chiral ligand (L) containing phenanthroline (Phen) and menthol moiety and EuL2(NO3)3 and TbL2(NO3)3 complexes. The absorption and luminescence spectra of free L in acetonitrile are shifted to the red at 10 nm with respect to Phen. The lifetime and quantum yield of luminescence of L are significantly increased (τ = 2.5 ns φf = 0.059) as compared with Phen (τ = 0.51 ns φf = 0.0087 [1]). As a result of intersystem crossing (ISC) ligand L goes to the triplet state (quantum yield φT = 0.092). The triplet-triplet absorption spectrum of L is a broad band with maximum at 450 nm. The protonation of L leads to the appearance of LH+ form which has a broad luminescence band with a maximum at 482 nm and a lifetime of 38 ns. The EuL2(NO3)3 complex exists in solution at a high concentration and exhibits a characteristic red luminescence. However, as the concentration of EuL2(NO3)3 decreases, the complex dissociates and the bands of free L ligand and protonated LH+ form appear in the absorption and luminescence spectra. Quantum-chemical calculations allow to calculate the geometry and absorption spectra of free and protonated ligands and EuL2(NO3)3 complex.

KW - Chiral substituted phenanthroline

KW - Complexes

KW - Laser flash photolysis

KW - Photophysical processes for free ligand and eu(III) and tb(III) complexes

KW - Quantum-chemical calculations

KW - Timeresolved luminescence

KW - 1,10-PHENANTHROLINE

KW - LN

KW - LUMINESCENCE PROPERTIES

KW - EU

KW - ENERGY-TRANSFER

KW - ABSORPTION

KW - DENSITY-FUNCTIONAL THEORY

KW - EXCHANGE

KW - SPECTRA

KW - GD

UR - http://www.scopus.com/inward/record.url?scp=85067487213&partnerID=8YFLogxK

U2 - 10.1016/j.jlumin.2019.116548

DO - 10.1016/j.jlumin.2019.116548

M3 - Article

AN - SCOPUS:85067487213

VL - 214

JO - Journal of Luminescence

JF - Journal of Luminescence

SN - 0022-2313

M1 - 116548

ER -