Synthesis and Opto-electronic features of 5,5′-bis(3,4-(ethylenedioxy)thien-2-yl)-2,2′-bipyridine

Dalal, Anuj; Nehra, Kapeesha; Hooda, Anjli; Singh, Devender; Malik, Rajender Singh; Kumar, Sumit

doi:10.1016/j.ijleo.2021.167942

Cited by 53 publications

(13 citation statements)

References 35 publications

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“…Two peaks in 685–720 cm −1 were ascribed to the symmetrical and antisymmetrical vibrational modes of the C–S–C unit in Eu3 and Eu4. [ 24 ] FTIR spectra of all complexes evidenced the peaks at 485–495 cm −1 and 515–525 cm −1 corresponding to the Eu–O and Eu–N bands respectively. The peak at ~1145 cm −1 was attributed to an alkyl C–F bond.…”

Section: Resultsmentioning

confidence: 99%

“…Chemical shift values of ligands have been reported previously. [ 24 ] Bonding of ligands and europium ions was analyzed by comparative spectral studies of both ligands and complexes. NMR data of complexes were found to be supportive for the isostructural complex formation.…”

Section: Resultsmentioning

confidence: 99%

“…[ 38 ] The absorption spectra of 2,2′‐bipyridine derivatives exhibited bands in the range 220–365 nm. [ 24 ] Electronic spectra of all complexes showed a broad band in the 250–350 nm range. It was observed that an absorption maximum in complexes shifted to a longer wavelength compared with the diketone ligand.…”

Section: Resultsmentioning

confidence: 99%

“…Cyclovoltammograms of ancillary moieties have already been reported. [ 24 ] The Eu4 complex has different values for the oxidation and reduction potentials in comparison with DD. These modified values indicated the formation of the expected metal complex.…”

Section: Resultsmentioning

confidence: 99%

“…The neutral ligands used for the synthesis were 2,2 0 -bipyridine (bpy) and its derivatives such as 5,5 0 -dibromo-2,2 0 -bipyridine (DBr), 5-bromo-5 0 - (3,4-[ethylenedioxy]thien-2yl)-2,2 0bipyridine (MD), and 5,5 0 -bis (3,4-[ethylenedioxy]thien-2-yl)-2,2 0bipyridine (DD). [24] The fundamental purpose of our work was to study the electronic effects of mono and di-substituted 2,2 0 -bipyridine derivatives on the optoelectronic and photoluminescence features of the prepared complexes. Ternary Eu(III) complexes have been used as red phosphors in the fabrication of white LEDs due to their wide excitation bands, large quantum yield, and high colour purity.…”

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confidence: 99%

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Red emissive ternary europium complexes: synthesis, optical, and luminescence characteristics

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Solid ternary europium complexes consisting of fluorinated β‐diketone (thenoyltrifluoroacetone, TTFA) and heteroaromatic bidentate auxiliary ligands were synthesized. The luminescence features of the complexes were estimated using various spectral measurements and clearly proved that the Eu3+ ion is efficiently sensitized by ligands by an antenna effect. Photoluminescence excitation spectra have shown that Eu(III) complexes are excited effectively in the ultraviolet (UV) region and the corresponding emission spectra consist of characteristic peaks attributed to the 5D0→7FJ transitions of the europium ion with the strongest emission peak at 611 nm (5D0→7F2). From photoluminescence (PL) data, decay time, Judd–Ofelt parameters, transition rates, and quantum efficiency of the complexes were also determined. The Commission Internationale de l'éclairage (CIE) colour coordinates indicated the bright red emission of ternary europium complexes. Correlated colour temperature values indicated the utilization of these complexes in display devices. Judd–Ofelt and photophysical parameters were also estimated theoretically using LUMPAC software. Various frontier molecular orbitals and their respective energy were determined. These red emissive europium complexes could be utilized for fabricating solid‐state lighting systems.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

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Red emissive ternary europium complexes: synthesis, optical, and luminescence characteristics

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Fluorinated β‐diketone‐based Sm(III) complexes: spectroscopic and optoelectronic characteristics

et al. 2022

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The synthesis and characterization of a series of octa‐coordinated Sm(III) complexes with 4,4,4‐trifluoro‐1‐(2‐naphthyl)‐1,3‐butanedione (TFNB) and 2,2′‐bipyridine (Bpy) derivatives as ancillary ligand are described here. The complexes were analyzed by elemental, spectroscopic such as infrared spectroscopy, 1H NMR, and thermogravimetric analyses. The fluorinated TFNB ligand absorbs in the range from 200 to 400 nm. The complexes show the sharp and structured Sm‐based emissions in visible region upon irradiation in UV range. Excitation spectra of complexes show similarity to the absorption spectra of ligands suggesting that excitation energy is transferred from ligands to Sm(III) centre by the antenna effect. Photoluminescence emission spectra and colour parameters affirmed that the complexes show luminescence in orange–red region. These luminous Sm(III) complexes might be applied as emissive layer in organic electroluminescent devices.

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Mononuclear luminous β‐diketonate Ln(III) complexes with heteroaromatic auxiliary ligands: synthesis and luminescence characteristics

et al. 2022

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A series of lanthanide (samarium and terbium) β‐diketonates with heteroaromatic auxiliary ligands was synthesized. The prepared complexes were characterized through electrochemical, thermal, and spectroscopic analyses. Infrared analysis revealed the binding of the respective metal ion to oxygen and nitrogen atoms of diketone and ancillary ligands. Thermogravimetry/differential thermogravimetry profiles provided thermal information and specified the high thermal stability of the prepared complexes. The complexes exhibited the sharp and structured Ln‐based emission in the visible region upon irradiation in the ultraviolet range. Photophysical analysis demonstrated the green and orange‐red emission due to the respective characteristic transitions of Tb3+ and Sm3+ ions. Photophysical properties affirmed the luminous behaviour of the synthesized complexes. These luminous lanthanide complexes could be used as emitting materials in the design of organic light‐emitting diodes.

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Synthesis and Opto-electronic features of 5,5′-bis(3,4-(ethylenedioxy)thien-2-yl)-2,2′-bipyridine

Cited by 53 publications

References 35 publications

Red emissive ternary europium complexes: synthesis, optical, and luminescence characteristics

Red emissive ternary europium complexes: synthesis, optical, and luminescence characteristics

Fluorinated β‐diketone‐based Sm(III) complexes: spectroscopic and optoelectronic characteristics

Mononuclear luminous β‐diketonate Ln(III) complexes with heteroaromatic auxiliary ligands: synthesis and luminescence characteristics

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