Synthesis and photophysical properties of hetero trinuclear complexes of tris β-diketonate Europium with organoplatinum chromophore

Rashid Ilmi, Ashanul Haque, Idris Juma Al-Busaidi, Nawal Al-Rasbi, Muhammad Khan

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Two hetero-trinuclear complexes of the type [Eu(btfa)3Pt2-bpy] and [Eu(nta)3Pt2-bpy] (where btfa and nta is the anion of 4,4,4-trifluoro-1-phenyl-1,3-butanedione; 4,4,4-trifluoro-1-(2-naphthyl)-1,3-butanedione, respectively and Pt2bpy = trans-[(Ph)(Et3P)2Pt–C≡C-R-C≡C–Pt(PEt3)2(Ph)] (R = 2,2‘-Bipyridine-6,6‘-diyl) have been synthesized by the reaction between [Eu(β-diketonate)3(H2O)2] (β-diketone = btfa and nta) and Pt2bpy complexes in 1:1 M ratio in THF at room temperature. The complexes have been characterized by analytical and spectroscopic methods. The complexes are soluble in common organic solvents. The photophysical properties of the novel hetero-trinuclear complexes have been analyzed by steady-state and time-resolved emission spectroscopy. The complexes exhibit typical red emission of Eu(III). The absence of any residual ligand emission in the 400–550 nm region clearly attests the efficient energy transfer from the triplet state (T1 = 20,408 cm−1) of Pt2bpy chromophore. The quantum efficiency (ϕEu) of [Eu(btfa)3Pt2-bpy] (ФEu∼53.95%) is 1.88 times higher than [Eu(nta)3Pt2-bpy] (ФEu∼28.63%), which could be due the larger value of the non-radiative decay rate (Anrad) ∼ 1754.41 s−1 for [Eu(nta)3Pt2-bpy] compared to Anrad ∼ 779.24 s−1 for [Eu(btfa)3Pt2-bpy]. Photometric characteristics of the complexes such as color correlated temperature (CCT) and luminous efficiency of the radiation (LER) suggest that the new materials may find potential application in high performance optoelectronic devices.

Original languageEnglish
Pages (from-to)59-66
Number of pages8
JournalDyes and Pigments
Volume162
DOIs
Publication statusPublished - Mar 1 2019

Fingerprint

Europium
Chromophores
Emission spectroscopy
Quantum efficiency
Optoelectronic devices
Energy transfer
Organic solvents
Anions
Negative ions
Ligands
Color
Radiation
Temperature
4,4,4 trifluoro-1-(2-naphthyl)1,3-butanedione
4,4,4-trifluoro-1-phenyl-1,3-butanedione

Keywords

  • Color correlated temperature
  • Eu(III)
  • Fluorinated β-diketone: Organoplatinum chromophore
  • Hetero-trinuclear (d-f-d) complexes
  • Luminous efficiency of the radiation

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Process Chemistry and Technology

Cite this

Synthesis and photophysical properties of hetero trinuclear complexes of tris β-diketonate Europium with organoplatinum chromophore. / Ilmi, Rashid; Haque, Ashanul; Al-Busaidi, Idris Juma; Al-Rasbi, Nawal; Khan, Muhammad.

In: Dyes and Pigments, Vol. 162, 01.03.2019, p. 59-66.

Research output: Contribution to journalArticle

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AU - Al-Rasbi, Nawal

AU - Khan, Muhammad

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N2 - Two hetero-trinuclear complexes of the type [Eu(btfa)3Pt2-bpy] and [Eu(nta)3Pt2-bpy] (where btfa and nta is the anion of 4,4,4-trifluoro-1-phenyl-1,3-butanedione; 4,4,4-trifluoro-1-(2-naphthyl)-1,3-butanedione, respectively and Pt2bpy = trans-[(Ph)(Et3P)2Pt–C≡C-R-C≡C–Pt(PEt3)2(Ph)] (R = 2,2‘-Bipyridine-6,6‘-diyl) have been synthesized by the reaction between [Eu(β-diketonate)3(H2O)2] (β-diketone = btfa and nta) and Pt2bpy complexes in 1:1 M ratio in THF at room temperature. The complexes have been characterized by analytical and spectroscopic methods. The complexes are soluble in common organic solvents. The photophysical properties of the novel hetero-trinuclear complexes have been analyzed by steady-state and time-resolved emission spectroscopy. The complexes exhibit typical red emission of Eu(III). The absence of any residual ligand emission in the 400–550 nm region clearly attests the efficient energy transfer from the triplet state (T1 = 20,408 cm−1) of Pt2bpy chromophore. The quantum efficiency (ϕEu) of [Eu(btfa)3Pt2-bpy] (ФEu∼53.95%) is 1.88 times higher than [Eu(nta)3Pt2-bpy] (ФEu∼28.63%), which could be due the larger value of the non-radiative decay rate (Anrad) ∼ 1754.41 s−1 for [Eu(nta)3Pt2-bpy] compared to Anrad ∼ 779.24 s−1 for [Eu(btfa)3Pt2-bpy]. Photometric characteristics of the complexes such as color correlated temperature (CCT) and luminous efficiency of the radiation (LER) suggest that the new materials may find potential application in high performance optoelectronic devices.

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