Utilization of a Pt(II) di-yne Chromophore incorporating a 2,2ʹ-bipyridine-5,5ʹ-diyl spacer as a Chelate to Synthesize a Green and Red Emitting d-f-d Heterotrinuclear Complex

Idris Juma Al-Busaidi, Rashid Ilmi, José D.L. Dutra, Willyan Oliveira, Ashanul Haque, Nawal K. Al-Rasbi, Frank Marken, Paul Raithby, Muhammad Khan

Research output: Contribution to journalArticlepeer-review

Abstract

A new heterotrinuclear (d-f-d) complex [Eu(btfa)31c] (btfa = 4,4,4-trifluoro-1-phenyl-1,3-butanedione and 1c = [(Ph)(Et3P)2Pt–C≡C–R–C≡C–Pt(Et3P)2(Ph)] (R = 2,2’-bipyridine-5,5’-diyl) has been synthesized by utilizing the N,N-donor sites of the organometallic chromophore. The complex was characterized by analytical and spectroscopic methods. Photophysical properties of the complex were analysed in detail using both steady-state and time-resolved emission and excitation spectroscopy. The optical absorption spectrum of the complex is dominated by the spin allowed π–π* transitions of the btfa and 1c units in the UV-visible region (200 – 418 nm) and thus is excitable over a wide range of wavelengths across the UV into the visible region of the electromagnetic spectrum. The complex displays typical red Eu(III) emission when excited at 345 nm. However, it also shows green emission when excited at 464 nm and, thus could be an interesting candidate for full colour display applications. The change in the colour could be a result of the high value of the energy back-transfer rate (6.73  105 s–1) from the triplet state of the organometallic chromophore to the 5D1 state of Eu(III). Judd-Ofelt (J-O) intensity parameters ( and ), radiative (AR), non-radiative (AR) decay rates and intrinsic quantum yield ( ) have been calculated.
Original languageEnglish
Pages (from-to)1465-1477
JournalDalton Transactions
Volume50
Issue number4
Early online date28 Dec 2020
DOIs
Publication statusPublished - 28 Jan 2021

Keywords

  • Platinum(II)
  • Europium(III)
  • Beta-diketonate
  • X-ray crystal structures
  • energy transfer process

ASJC Scopus subject areas

  • Chemistry(all)

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