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Vibrational quenching in near‐infrared emitting lanthanide complexes : a quantitative experimental study and novel insights

Dimitrije Mara (UGent) , Flavia Artizzu (UGent) , Philippe Smet (UGent) , Anna Kaczmarek (UGent) , Kristof Van Hecke (UGent) and Rik Van Deun (UGent)
(2019) CHEMISTRY-A EUROPEAN JOURNAL. 25(69). p.15944-15956
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Abstract
Two series of novel NIR-emissive complexes of Nd3+, Sm3+, Er3+ and Yb3+ with two different beta-diketonate ligands (L-1=4,4,4-trifluoro-1-phenyl-1,3-butadione and L-2=4,4,4-trifluoro-1-(4-chlorophenyl)-1,3-butadione) are reported. The neutral triphenylphosphine oxide (tppo) ligand was used to replace coordinated water molecules in the first coordination sphere of the as-obtained [Ln(L-1(2))(3)(H2O)(2)] complexes to afford water-free [Ln(L-1(2))(3)(tppo)(2)] molecular species. Upon replacement of water molecules by tppo units, the NIR emission lifetimes of the Nd3+, Er(3+)and Sm(3+)complexes increase by about one order of magnitude up to values of approximate to 9, 8 and 113 ms while Yb3+ complexes reach intrinsic quantum yields as high as to phi(Yb)=6.5 %., which are remarkably high for fully hydrogenated complexes. Vibrational quenching by CH and OH oscillators has been quantitatively assessed by implementing the Forster's model of resonance energy transfer on the basis of experimental data. This study demonstrates that highly efficient NIR-emitting lanthanide complexes can be obtained with facile, cheap and accessible syntheses through a rational design.
Keywords
lanthanides, long lived emission, NIR emission, quenching, BETA-DIKETONE LIGAND, LUMINESCENT HYBRID MATERIALS, C-H, ORGANIC-COMPLEXES, EMISSION, YTTERBIUM, ERBIUM, SENSITIZATION, NEODYMIUM, ER3+

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MLA
Mara, Dimitrije, et al. “Vibrational Quenching in Near‐infrared Emitting Lanthanide Complexes : A Quantitative Experimental Study and Novel Insights.” CHEMISTRY-A EUROPEAN JOURNAL, vol. 25, no. 69, 2019, pp. 15944–56.
APA
Mara, D., Artizzu, F., Smet, P., Kaczmarek, A., Van Hecke, K., & Van Deun, R. (2019). Vibrational quenching in near‐infrared emitting lanthanide complexes : a quantitative experimental study and novel insights. CHEMISTRY-A EUROPEAN JOURNAL, 25(69), 15944–15956.
Chicago author-date
Mara, Dimitrije, Flavia Artizzu, Philippe Smet, Anna Kaczmarek, Kristof Van Hecke, and Rik Van Deun. 2019. “Vibrational Quenching in Near‐infrared Emitting Lanthanide Complexes : A Quantitative Experimental Study and Novel Insights.” CHEMISTRY-A EUROPEAN JOURNAL 25 (69): 15944–56.
Chicago author-date (all authors)
Mara, Dimitrije, Flavia Artizzu, Philippe Smet, Anna Kaczmarek, Kristof Van Hecke, and Rik Van Deun. 2019. “Vibrational Quenching in Near‐infrared Emitting Lanthanide Complexes : A Quantitative Experimental Study and Novel Insights.” CHEMISTRY-A EUROPEAN JOURNAL 25 (69): 15944–15956.
Vancouver
1.
Mara D, Artizzu F, Smet P, Kaczmarek A, Van Hecke K, Van Deun R. Vibrational quenching in near‐infrared emitting lanthanide complexes : a quantitative experimental study and novel insights. CHEMISTRY-A EUROPEAN JOURNAL. 2019;25(69):15944–56.
IEEE
[1]
D. Mara, F. Artizzu, P. Smet, A. Kaczmarek, K. Van Hecke, and R. Van Deun, “Vibrational quenching in near‐infrared emitting lanthanide complexes : a quantitative experimental study and novel insights,” CHEMISTRY-A EUROPEAN JOURNAL, vol. 25, no. 69, pp. 15944–15956, 2019.
@article{8636609,
  abstract     = {Two series of novel NIR-emissive complexes of Nd3+, Sm3+, Er3+ and Yb3+ with two different beta-diketonate ligands (L-1=4,4,4-trifluoro-1-phenyl-1,3-butadione and L-2=4,4,4-trifluoro-1-(4-chlorophenyl)-1,3-butadione) are reported. The neutral triphenylphosphine oxide (tppo) ligand was used to replace coordinated water molecules in the first coordination sphere of the as-obtained [Ln(L-1(2))(3)(H2O)(2)] complexes to afford water-free [Ln(L-1(2))(3)(tppo)(2)] molecular species. Upon replacement of water molecules by tppo units, the NIR emission lifetimes of the Nd3+, Er(3+)and Sm(3+)complexes increase by about one order of magnitude up to values of approximate to 9, 8 and 113 ms while Yb3+ complexes reach intrinsic quantum yields as high as to phi(Yb)=6.5 %., which are remarkably high for fully hydrogenated complexes. Vibrational quenching by CH and OH oscillators has been quantitatively assessed by implementing the Forster's model of resonance energy transfer on the basis of experimental data. This study demonstrates that highly efficient NIR-emitting lanthanide complexes can be obtained with facile, cheap and accessible syntheses through a rational design.},
  author       = {Mara, Dimitrije and Artizzu, Flavia and Smet, Philippe and Kaczmarek, Anna and Van Hecke, Kristof and Van Deun, Rik},
  issn         = {0947-6539},
  journal      = {CHEMISTRY-A EUROPEAN JOURNAL},
  keywords     = {lanthanides,long lived emission,NIR emission,quenching,BETA-DIKETONE LIGAND,LUMINESCENT HYBRID MATERIALS,C-H,ORGANIC-COMPLEXES,EMISSION,YTTERBIUM,ERBIUM,SENSITIZATION,NEODYMIUM,ER3+},
  language     = {eng},
  number       = {69},
  pages        = {15944--15956},
  title        = {Vibrational quenching in near‐infrared emitting lanthanide complexes : a quantitative experimental study and novel insights},
  url          = {http://dx.doi.org/10.1002/chem.201904320},
  volume       = {25},
  year         = {2019},
}

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