@article{8617131,
  abstract     = {In this study, we report the synthesis and some new crystal structures of tetrakis lanthanide β-diketonate
complexes throughout the lanthanide series for homonuclear (Pr3+, Nd3+, Sm3+, Eu3+, Tb3+, Dy3+, Er3+ and
Yb3+) as well as for heteronuclear (Eu3+-Tb3+ and Tb3+-Sm3+) complexes. The well-known 1,1,1-trifluoro-2,4-
pentadione (Htfac) ligand has been used in the synthesis. Here, we show that when employing the same synthesis
conditions, we can obtain complexes with different coordination environments of the lanthanide ions. This is
strongly linked to the ionic radius of the lanthanide ion. The luminescence properties of the visible emitting
complexes (Ln3+=Eu3+, Tb3+, Sm3+ and Dy3+) were investigated in solution as well as solid state. The nearinfrared
emitting complexes (Ln3+=Pr3+, Nd3+, Er3+ and Yb3+) were recorded in the solid state. The heteronuclear
complexes ([Eu1-xTbx(tfac)8]2-Na2
+ (x: 0.59 (1) and 0.47 (2), Tb1-ySmy(tfac)8]2-Na2
+ (y: 0.1 (3) and
0.2 (4)) and homonuclear complex [Dy(tfac)4)]−Na+ (DyL4) exhibited temperature-dependent luminescence
properties in the physiological range, with complex DyL4 showing the highest relative sensitivity Sr=3.45%
K−1 (280 K). Complex 2 also showed a high Sr=2.70% K−1 (353 K), which makes them promising for application
as physiological luminescence thermometers. To the best of our knowledge until now no lanthanide β-
diketonate complexes have been reported for use as good luminescence thermometers operating in the physiological
range.},
  author       = {Mara, Dimitrije and Artizzu, Flavia and Laforce, Brecht and Vincze, Laszlo and Van Hecke, Kristof and Van Deun, Rik and Kaczmarek, Anna},
  issn         = {0022-2313},
  journal      = {Journal of Luminescence},
  keywords     = {Lanthanide Tetrakis complexes,β-Diketonate,Photoluminescence,Temperature Sensing},
  language     = {eng},
  pages        = {343--355},
  publisher    = {Elsevier BV},
  title        = {Novel tetrakis lanthanide β-diketonate complexes: Structural study, luminescence properties and temperature sensing},
  url          = {http://dx.doi.org/10.1016/j.jlumin.2019.05.035},
  volume       = {213},
  year         = {2019},
}

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