Crystal Structures and Spectroscopic Properties of trans-N,P-[Pt(ppy)(Pmor3)Cl] and trans-N,P-[Pt(tpy)(Pmor3)Cl].CH3CN [ppy = N,C'-chelated 2-phenylpyridinate, tpy = N,C'-Chelated 2-(2'-thienyl)pyridinate, Pmor3 = tris(morpholino)phosphine].

Балашев, К. П.; Engebretsen, Thoralf; Kvam, Per-Inge; Maartmann-Moe, Knut; Puzyk, Michael V.; Songstad, Jon; Homsi, Muhammed Nour; Kuske, Frank K. H.; Haugg, Monika; Trabesinger-Rüf, Nathalie; Weinhold, Elmar G.

doi:10.3891/acta.chem.scand.50-1108

Cited by 13 publications

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“…The results of the search are as follows: the smallest Pt−Pt distance was 3.528 Å and the longest Pt−Pt distance was 8.679 Å . The average Pt−Pt distance was 6.72 Å among the eight found structures. − Thus, complexes 15 and 17 from this investigation possess above average Pt−Pt distances. It appears that Pt−Pt measurement is the simplest test of the bulkiness of the Pt complex.…”

Section: Resultsmentioning

confidence: 70%

Syntheses, Structural Characterization, and First Electroluminescent Properties of Mono-cyclometalated Platinum(II) Complexes with Greater than Classical π−π Stacking and Pt−Pt Distances

2005

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A series of mono-cyclometalated Pt(II) complexes (9, 10, 13, 15, and 17) bearing 2-(3,5-bis(trifluoromethyl)phenyl)-4-methylpyridine (1) as the same chromophoric N∧C cyclometalated ligand and the second nonchromophoric bidenate ligands with increasing bulkiness were synthesized by the following steps. The palladium-catalyzed cross-coupling reaction between 2-chloro-4-methylpyridine (2) and 3,5-bis(trifluoromethyl)phenylboronic acid (3) was used to prepare 2-(3,5-bis(trifluoromethyl)phenyl)-4-methylpyridine (1). Di-tert-butyl(trimethylsilyl)anylmethylphosphine, tert-Bu2P-CH2-SiMe3 (5), was used as a ligand for the Suzuki coupling. The cyclometalation of 1 by K2PtCl4 (7) was carried out in (MeO)3PO (8) with the formation of a chloro-bridged dimer N∧CPt(μ-Cl)2PtC∧N (9). The reactions of 9 with 2,2,6,6-tetramethylheptane-3,5-dionate (11), 1,1,1,3,3,3-hexafluoro-2-pyrazol-1-ylmethylpropan-2-ol (12), 2-[(diphenylphosphanyl)methyl]-1,1,1,3,3,3-hexafluoropropan-2-ol (14), and 2-[(di-tert-butylphosphanyl)methyl]-1,1,1,3,3,3-hexafluoropropan-2-ol (16) afforded square-planar Pt(II) complexes 10, 13, 15, and 17, correspondingly. According to X-ray analyses, the plane-to-plane distances of the π−π stacked complexes (10, 13, 15, and 17) increase from 3.478 Å for 10 to 4.203 Å for 15. The value of 4.203 Å for aromatic−aromatic π−π interaction is greater than the usual range of 3.3−3.8 Å for these phenomena. Pt−Pt distances increase from 5.076 Å for 13 to 8.123 Å for 17. The geometry of complex 17 deviates greatly from square planar and is best described as “bowl-shaped”. The effect of an increased π−π stacking distance on the electroluminescent properties of these Pt compounds is studied. The typical yellow luminescence band associated with the excimers of Pt compounds is absent for complex 15; however, it shows a green 540 nm electroluminesce band instead. An efficient LED constructed using compound 15 shows green electroluminescence with a peak efficiency of 6 cd/A.

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Section: Resultsmentioning

confidence: 70%

Syntheses, Structural Characterization, and First Electroluminescent Properties of Mono-cyclometalated Platinum(II) Complexes with Greater than Classical π−π Stacking and Pt−Pt Distances

2005

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“…(π → π*) that show similar absorption bands in this region. 23,24 The metal-to-ligand charge transfer (MLCT) and ligand-toligand charge transfer (LLCT) transitions are located between 350 nm and 450 nm. 18 The emission of 1-7 is ascribed to a mixed 3 LC-MLCT state and the specific effects of the substituent at the C^N ligands can directly be seen in the emission spectra (Fig.…”

Section: Dalton Transactions Papermentioning

confidence: 99%

Photophysical properties and OLED performance of light-emitting platinum(ii) complexes

et al. 2013

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The synthesis, photophysical properties and application as emitters in solution-processed multi-layer organic light-emitting diodes (OLEDs) of a series of blue-green to red light-emitting phosphorescent platinum(II) complexes are reported. These complexes consist of phenylisoquinoline, substituted phenylpyridines or tetrahydroquinolines as C^N cyclometalating ligands and dipivaloylmethane as an ancillary ligand. Depending on both the structure of the C^N cyclometalating ligands and the dopant concentration in the matrix, these platinum(II) complexes exhibit different aggregation tendencies. This property affects the photoluminescence spectra of the investigated compounds and colour-stability of the fabricated OLEDs. Using the blue-green to yellow-green emitting complexes, the best results were obtained with the 2-(4-trifluoromethylphenyl)-5,6,7,8-tetrahydroquinoline based platinum(II) complex. A maximum luminous efficiency of 4.88 cd A(-1) and a power efficiency of 4.65 lm W(-1), respectively, were achieved. Employing the red emitting phenylisoquinoline based complex as an emitter, colour-stable and efficient (4.71 cd A(-1), 5.12 lm W(-1)) devices were obtained.

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“…12,[30][31][32][33] The strong absorption for all complexes 1-5 at 225-345 nm can be related to spin-allowed ligand-centered transitions (π → π*), which are the expected absorption bands in this region. 18,34,35 Solvatochromatic metal-to-ligand charge transfer (MLCT) and ligand-to-ligand charge transfer (LLCT) transitions are located between 350 and 450 nm. 18,12 The β-diketonato ligand has no detectable influence on the luminescence properties of the excited state.…”

Section: Synthesis and Characterizationmentioning

confidence: 99%

Oxygen and temperature sensitivity of blue to green to yellow light-emitting Pt(ii) complexes

et al. 2012

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Crystal Structures and Spectroscopic Properties of trans-N,P-[Pt(ppy)(Pmor3)Cl] and trans-N,P-[Pt(tpy)(Pmor3)Cl].CH3CN [ppy = N,C'-chelated 2-phenylpyridinate, tpy = N,C'-Chelated 2-(2'-thienyl)pyridinate, Pmor3 = tris(morpholino)phosphine].

Cited by 13 publications

References 0 publications

Syntheses, Structural Characterization, and First Electroluminescent Properties of Mono-cyclometalated Platinum(II) Complexes with Greater than Classical π−π Stacking and Pt−Pt Distances

Syntheses, Structural Characterization, and First Electroluminescent Properties of Mono-cyclometalated Platinum(II) Complexes with Greater than Classical π−π Stacking and Pt−Pt Distances

Photophysical properties and OLED performance of light-emitting platinum(ii) complexes

Oxygen and temperature sensitivity of blue to green to yellow light-emitting Pt(ii) complexes

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