Ortho-platinated metallomesogens based on rod mesogenic unit of 2-phenylpyridine derivatives: synthesis, high linearly polarised and phase-state-dependent luminescence

Guo, Zou; Luo, Kongjia; Zhao, Ling; Ni, Hai‐Liang; Wang, Haifeng; Li, Quan

doi:10.1080/02678292.2017.1365384

Cited by 12 publications

(7 citation statements)

References 39 publications

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“…Although the mesophase could not be definitely assigned based on these XRD data, we assume a Col h phase with p6mm symmetry ( (Figure 13b, Table 5). Neither emission intensity nor Stokes shift were affected by the chain lengths, which is in good agreement with previous results by Li 88 and Goncalves. 89 However, the number of alkoxy chains in the periphery of the diazafluorenones considerably influenced absorption and emission spectra, as shown for DAF(OC12) m (m = 2,4,6) ( Figure 13c,d).…”

Section: Studies On Mesomorphism Mesomorphic Properties Of Diazafluosupporting

confidence: 93%

“…A pronounced orange luminescence emission band at λ = 575 nm was observed, resulting in a large Stokes shift of 10620 cm −1 (Figure 13b, Table 5). Neither emission intensity nor Stokes shift were affected by the chain lengths, which is in good agreement with previous results by Li et al 88 and Goncalves et al 89 However, the number of alkoxy chains in the periphery of the diazafluorenones considerably influenced absorption and emission spectra, as shown for DAF(OC12) m (m = 2, 4, 6) (Figure 13c,d). The absorption maximum was only slightly red-shifted with increasing number of side chains from 358 nm for DAF(OC12) 2 to 364 and 359 nm for DAF(OC12) 4 and DAF(OC12) 6 , respectively, along with minor changes of the relative intensities (Figure 13c).…”

Section: ■ Introductionmentioning

confidence: 99%

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Novel Luminescent Diazafluorenone Liquid Crystals

Bader

Baro

Ehni

et al. 2019

Crystal Growth & Design

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In this work, the synthesis, X-ray crystal structure analysis, studies on mesomorphism and luminescence spectroscopy of 2,7-diphenyl-4,5-diazafluorenones carrying 2, 4 or 6 peripheral alkoxy side chains of different lengths in the mesogenic unit are reported. The latter was attached to starting 2,7-dibromo-4,5-diazafluoren-9-one via Suzuki cross coupling of the respective 2-(alkoxyphenyl)-tetramethyl-1,2,3-borolane. The liquid crystalline properties were found to depend on both the number of side chains and their lengths. Derivatives with two short alkoxy chains (C6-C8) in the periphery formed nematic (N) and smectic C (SmC) mesophases while for the higher homologues only SmC mesophases were observed. Compounds carrying six alkoxy side chains with a minimum length of C8 assembled into columnar hexagonal phases. Homologues with C14 and C16 chain length displayed additionally two columnar rectangular mesophases. Four peripheral alkoxy chains, however, led to the loss of mesomorphism. Crystal structure data of a series of rod-shaped diazafluorenones helped to rationalize their liquid crystalline self-assembly and to understand geometry and thermal stability. Temperature-dependent luminescence spectra of diazafluorenone with two C12 chains revealed aggregation-induced emission (AIE) depending on the supramolecular order of the bulk phase. These studies suggested that AIE requires a lower degree of aggregation as compared to mesophase formation.

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Section: Studies On Mesomorphism Mesomorphic Properties Of Diazafluosupporting

confidence: 93%

Section: ■ Introductionmentioning

confidence: 99%

Novel Luminescent Diazafluorenone Liquid Crystals

Bader

Baro

Ehni

et al. 2019

Crystal Growth & Design

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“…Zou et al then reported a series of Pt complexes (14 and 15) in which the 2-phenylpyridine moiety was functionalised with a hexadecyloxy chain on the pyridine ring and flexibly linked cyanobiphenyl on the phenyl ring with either an acac (14) or a picolinato (15) co-ligand. 59 The complexes were liquid-crystalline and for complexes 14 with one cyanobiphenyl group, a SmA phase was observed while for 15 with R3 = Rn, a nematic phase was seen. The complexes were emissive in solution with the lum = 0.1 to 0.30, but the nature of the emission depended on the state of organisation, with a bathochromic shift, most likely arising from direct Pt … Pt interactions, in the solid state when compared with the liquid crystal phase.…”

Section: Cyclometallated Pt Complexes With Bidentate C^n Ligandsmentioning

confidence: 96%

An overview of phosphorescent metallomesogens based on platinum and iridium

Zhu

Bruce

et al. 2018

J. Mater. Chem. C

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“…Some few Pt(II) metallomesogens with improved polarized emission properties or hole mobility were reported shortly after. − The compounds form columnar, smectic, and nematic mesophases and display polarized emission with dichroic ratios of up to 3, 6–7, or 24, respectively. It is interesting to note that this behavior seems to be directly related to the supramolecular organization in the mesophase.…”

Section: Phosphorescent Pt(ii) and Ir(iii) Metallomesogensmentioning

confidence: 99%

Advanced Functional Luminescent Metallomesogens: The Key Role of the Metal Center

2021

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The use of liquid crystals for the fabrication of displays incorporated in technological devices (TVs, calculators, screens of eBook’s, tablets, watches) demonstrates the relevance that these materials have had in our way of living. However, society evolves, and improved devices are looked for as we create a more efficient and safe technology. In this context, metallomesogens can behave as multifunctional materials because they can combine the fluidic state of the mesophases with properties such as photo and electroluminescence, which offers new exciting possibilities in the field of optoelectronics, energy, environment, and even biomedicine. Herein, it has been established the role of the molecular geometry induced by the metal center in metallomesogens to achieve the self-assembly required in the liquid-crystalline mesophase. Likewise, the effect of the coordination environment in metallomesogens has been further analyzed because of its importance to induce mesomorphism. The structural analysis has been combined with an in-depth discussion of the properties of these materials, including their current and potential future applications. This review will provide a solid background to stimulate the development of novel and attractive metallomesogens that allow designing improved optoelectronic and microelectronic components. Additionally, nanoscience and nanotechnology could be used as a tool to approach the design of nanosystems based on luminescent metallomesogens for use in bioimaging or drug delivery.

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Ortho-platinated metallomesogens based on rod mesogenic unit of 2-phenylpyridine derivatives: synthesis, high linearly polarised and phase-state-dependent luminescence

Cited by 12 publications

References 39 publications

Novel Luminescent Diazafluorenone Liquid Crystals

Novel Luminescent Diazafluorenone Liquid Crystals

An overview of phosphorescent metallomesogens based on platinum and iridium

Advanced Functional Luminescent Metallomesogens: The Key Role of the Metal Center

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