Wydział Chemii

Ewa Kasprzycka

Victor A. Trush

Lucjan B. Jerzykiewicz

Vladimir M. Amirkhanov

Adam Watras

Jerzy Sokolnicki

Oscar L. Malta

Paula Gawryszewska

2019

Dyes and Pigments

160

439-449

10.1016/j.dyepig.2018.08.015

Naukowa

Angielski

Artykuł

The lanthanide complexes of the type Na[Ln(L)₄] (LnL1) (Ln = Nd³⁺, Eu³⁺, Tb³⁺, Yb³⁺), with di(4-methylphenyl) (2-naphthyl)sulfonylamidophosphate (HL¹), as well as sodium salt (NaL), were synthesized. Single-crystal X-ray diffraction, IR, absorption and emission spectroscopies at 300, 77 and 4 K were used to characterize the compounds. The ligand-to-metal energy transfer processes were analyzed. The dominant role of the ligand singlet state in intramolecular energy transfer processes was discussed and the main channels of the ligand-to-metal energy transfer for EuL1 are proposed as S₁→ ⁵G₃, ⁵G₆, ⁵D_4,⁵L₆ with a fast contribution and S₁ → T₁ → ⁵D₁ with a slow contribution. The calculations of nonradiative rates of energy transfer covered the higher lying excited levels of Eu³⁺ (⁵D_J, ⁵L_J, ⁵G_J).

The participation of both the multipolar and exchange mechanisms was considered. The number of parameters determined for LnL1 such as: experimental intensity parameters (Ω_λ), radiative (A_rad) and non-radiative (A_nrad) decay rates, emission lifetimes (τ), theoretical and experimental quantum yields were compared with the data for lanthanide complexes with dimethyl (2-naphthyl)sulfonylamidophosphate (LnL2). The strong temperature dependence of the excited ⁵D₄ level lifetime of TbL1 was recorded in the range of 30 μs – 2 ms, in the temperature range 300–77 K. This phenomenon could be used in chemical thermometry.

Lanthanide, Phosphorylated sulfonamides, energy transfer, spectroscopy, crystal structure, Judd–Ofelt theory

https://doi.org/10.1016/j.dyepig.2018.08.015

http://www.elsevier.com