New iridium cyclometallated complexes with potential application in OLED

Salinas, S; Soto-Arriaza, Marco; Loeb, Bárbara

doi:10.1016/j.poly.2011.08.010

Cited by 16 publications

(11 citation statements)

References 26 publications

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“…57,58 The [Ru( phen) 3 ](BF 4 ) 2 complex was prepared according to the method of Ellis et al 30 The complexes [Ru( phen) 2 The ionization process by electrospray was developed at 4000 V with N 2 at 300°C, 10 psi and a flow of 5 L min −1 . The acquisition of spectra is at positive and negative polarity.…”

Section: Synthesis Of the Complexesmentioning

confidence: 99%

Effect of free rotation in polypyridinic ligands of Ru(ii) complexes applied in light-emitting electrochemical cells

et al. 2013

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In the present work we report the synthesis and the electrochemical, photoluminescent and electroluminescent properties of two new Ru(II) complexes described by the general formula [Ru(phen)2X](2+), where phen is 1,10-phenanthroline. The X ligand consists of a 2,2'-bipyridine (bpy) unit substituted with two phenyl rings connected to the bpy core through a saturated (Lhydro = 4,4'-diphenylethyl-2,2'-bipyridine) or a conjugated (LH = 4,4'-bis(α-styrene)-2,2'-bipyridine) carbon-carbon bridge. The photoluminescent spectra indicate that, both in solution and solid state, the complex bearing the aliphatic substitution bridges exhibits a higher quantum yield and a longer excited state lifetime than the fully conjugated complex. The new complexes were used in light-emitting electrochemical cells (LECs) showing red emission for the complex with the Lhydro ligand and no light emission for the complex incorporating the LH ligand. This and the photophysical properties make it plausible that for these complexes the degree of freedom increases with aliphatic substitution. As a consequence, the negative effect of the auto-quenching processes taking place in solid LEC devices due to the close molecular packing is limited. When compared with the archetype [Ru(phen)3](2+) complex, the complex with aliphatic substitution shows better performance in the device supporting the beneficial effect of the bulky substitution.

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Section: Synthesis Of the Complexesmentioning

confidence: 99%

Effect of free rotation in polypyridinic ligands of Ru(ii) complexes applied in light-emitting electrochemical cells

et al. 2013

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“…27 As it has already been reported, in this type of compounds the HOMO is composed of a mixture of Ir(III) dπ orbitals and phenyl π orbitals of the cyclometalating ligands, and the LUMO correspond to the π* orbitals of the ancillary tBuB ligand. [21][22][23] The electrochemical gaps obtained from Table 1 are 2.31 V (1) and 2.72 V (2). According to these data, it would be expected that the photoluminescent maximum of complex 1 to appear red shifted in comparison with the spectrum of complex 2.…”

Section: Electrochemical and Photophysical Propertiesmentioning

confidence: 97%

“…The electrochemical and electronic spectroscopy properties of complex 1 were reported in a previous work. 21 Table 1 summarizes the corresponding data, as well as the equivalent information for complex 2 taken from literature. 22,23 In both cases, all data were obtained from measurements at room temperature in acetonitrile (ACN) solutions.…”

Section: Electrochemical and Photophysical Propertiesmentioning

confidence: 99%

“…20 Some years ago, our group reported the synthesis and, electrochemical and spectroscopic characterization of a new bis-cyclometalated Ir(III) complex, of general formula [Ir(bzq) 2 (tBuB)](PF 6 ), where bzq = 7,8-benzoquinoline and tBuB = 4,4´-diterbutyl-2,2´-bipyridine. 21 In this work, the fabrication of a LEC device with this complex, and the evaluation of the electroluminescent properties are reported and discussed in comparison with the analogue complex with 2-phenylpyridine (ppy).…”

Section: Introductionmentioning

confidence: 99%

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ANOMALOUS BEHAVIOR OF Ir(III) CYCLOMETALATED COMPLEXES: APPLICATION IN LIGHT-EMITTING ELECTROCHEMICAL CELLS

Dreyse

Loeb

Barrera

et al. 2014

J. Chil. Chem. Soc.

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The cationic Ir(III) complex with 7,8-benzoquinoline (bzq) as cyclometalating ligand and 4,4´-diterbutyl-2,2´-bipyridine (tBuB) as ancillary ligand, [Ir(bzq) 2 (tBuB)](PF 6 ) (1), was utilized in the fabrication of a light-emitting electrochemical cell (LEC). The photophysical properties and the characterization of the LEC device with this complex was compared with literature data for the analogous complex with 2-phenylpyridine (ppy), [Ir(ppy) 2 (tBuB)](PF 6 ) (2). Complex 1 showed blue shifted emission compared to complex 2. Surprisingly, complex 1 shows lower luminance, efficiency and stability in regard to 2. This behavior correlated well with the low values of quantum yield and lifetime, registered for complex 1 in solution. The performance observed is unexpected, taking into account the emission wavelengths recorded for each complex, and the lesser non radiative deactivation processes expected for a complex with a more rigid ligand as bzq. A possible explanation of this behavior is given in terms of the predominance of a fluorescent emission in the case of the complex 1 instead of a phosphorescent emission, as observed for complex 2.

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“…Since then numerous heteroleptic Ir(III)-7,8-benzoquinoline complexes were reported with very same coordination mode. [12][13][14][15][16][17][18] The Ir-benzoquinoline complexation could be viewed as the formation of initial Ir-N(quinoline) bond, which selectively induces the C10-H bond activation and leads to Ir-C10 coordination. This results in a stable vemembered chelation by 7,8-benzoquinoline.…”

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confidence: 99%

Unexpected ortho C–H bond activation in coordinated 7,8-benzoquinoline: synthesis and characterisation of heteroleptic Ir(iii)-7,8-benzoquinoline complexes

2021

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New iridium cyclometallated complexes with potential application in OLED

Cited by 16 publications

References 26 publications

Effect of free rotation in polypyridinic ligands of Ru(ii) complexes applied in light-emitting electrochemical cells

Effect of free rotation in polypyridinic ligands of Ru(ii) complexes applied in light-emitting electrochemical cells

ANOMALOUS BEHAVIOR OF Ir(III) CYCLOMETALATED COMPLEXES: APPLICATION IN LIGHT-EMITTING ELECTROCHEMICAL CELLS

Unexpected ortho C–H bond activation in coordinated 7,8-benzoquinoline: synthesis and characterisation of heteroleptic Ir(iii)-7,8-benzoquinoline complexes

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