Synthesis, structure and tuneable white-light emission of dinuclear Eu(III),Tb(III)-mixed Schiff base complexes

Amani Al-Bahri, Amina S. Al-Zakwani, Suhaib M. Al-Farsi, Nawal K. Al-Rasbi

Research output: Contribution to journalArticle

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Abstract

A new family of lanthanide-Schiff base complexes have been synthesized and fully characterized from the novel Schiff base ligand: H2L1 (acetic acid 2-hydroxy-benzylidene-hydrazide). The single crystal X-ray structure and mass spectroscopy reveal the isostructural dinuclear complexes: [Ln2L1(HL1)3(NO3)] where Ln = Sm, Eu, Gd and Tb. Upon excitation of the LnIII complexes in solution, their luminescence spectra display the broad ligand centred (LC) band at ∼470 nm as well as the narrow f–f transitions. In EuIII complex, the LC emission is efficiently quenched, because of the better triplet state energy match to the EuIII5D4 excited states. Doping methods of EuIII with TbIII into the complexes: [EuxTb1-x(L1)(HL1)3(NO3)], x = 0.5 (A), 1.0 (B) and 1.5 (C); in MeOH/DCM (1:10), have revealed variable colours. By careful control of the amounts of EuIII and TbIII in the dinuclear mixed EuTb-complexes, white-light emission is obtained from blue LC band, green TbIII luminescence and red EuIII luminescence. Such behaviour is attributed to the efficient sensitization of EuIII by the ligand and the metal to metal energy transfer from TbIII to EuIII excited 4f states.

Original languageEnglish
Pages (from-to)1393-1399
Number of pages7
JournalChemistrySelect
Volume1
Issue number7
DOIs
Publication statusPublished - Jan 1 2016

Fingerprint

Schiff Bases
Light emission
Ligands
Luminescence
Excited states
Metals
Lanthanoid Series Elements
Acetic Acid
Energy transfer
Electron energy levels
Doping (additives)
Single crystals
Spectroscopy
Color
X rays

Keywords

  • Crystal structure
  • Emission
  • Lanthanides
  • Schiff bases
  • White Light

ASJC Scopus subject areas

  • Chemistry(all)

Cite this

Synthesis, structure and tuneable white-light emission of dinuclear Eu(III),Tb(III)-mixed Schiff base complexes. / Al-Bahri, Amani; Al-Zakwani, Amina S.; Al-Farsi, Suhaib M.; Al-Rasbi, Nawal K.

In: ChemistrySelect, Vol. 1, No. 7, 01.01.2016, p. 1393-1399.

Research output: Contribution to journalArticle

Al-Bahri, Amani ; Al-Zakwani, Amina S. ; Al-Farsi, Suhaib M. ; Al-Rasbi, Nawal K. / Synthesis, structure and tuneable white-light emission of dinuclear Eu(III),Tb(III)-mixed Schiff base complexes. In: ChemistrySelect. 2016 ; Vol. 1, No. 7. pp. 1393-1399.
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AB - A new family of lanthanide-Schiff base complexes have been synthesized and fully characterized from the novel Schiff base ligand: H2L1 (acetic acid 2-hydroxy-benzylidene-hydrazide). The single crystal X-ray structure and mass spectroscopy reveal the isostructural dinuclear complexes: [Ln2L1(HL1)3(NO3)] where Ln = Sm, Eu, Gd and Tb. Upon excitation of the LnIII complexes in solution, their luminescence spectra display the broad ligand centred (LC) band at ∼470 nm as well as the narrow f–f transitions. In EuIII complex, the LC emission is efficiently quenched, because of the better triplet state energy match to the EuIII–5D4 excited states. Doping methods of EuIII with TbIII into the complexes: [EuxTb1-x(L1)(HL1)3(NO3)], x = 0.5 (A), 1.0 (B) and 1.5 (C); in MeOH/DCM (1:10), have revealed variable colours. By careful control of the amounts of EuIII and TbIII in the dinuclear mixed EuTb-complexes, white-light emission is obtained from blue LC band, green TbIII luminescence and red EuIII luminescence. Such behaviour is attributed to the efficient sensitization of EuIII by the ligand and the metal to metal energy transfer from TbIII to EuIII excited 4f states.

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