Synthesis and optical properties of quinoxaline-containing poly(aryl ether)s

Barberis, Vasilis P.; Mikroyannidis, John A.; Spiliopoulos, Ioakim K.

doi:10.1016/j.synthmet.2007.05.002

Cited by 5 publications

(1 citation statement)

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“…The red or blue shifting depends on the number of cyano groups and also on the orthoposition, metaposition, or paraposition on the benzene rings [22]. Photodiodes based on fluorescent organic compounds have been seen as a viable alternative to artificial lighting [23,24]. Our approach is to design a series of liquid crystal cyanoterphenyls harnessing their spontaneous alignment to potentially improve their luminescent properties.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Study of Chemical, Thermal, Mesomorphic, and Optical Properties of Terphenyls Modified with Nitrile Groups

González

Carrillo-Castillo

Ambrosio

et al. 2017

Journal of Chemistry

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We report the synthesis, characterization, and the thermotropic and photoluminescence properties of dialkoxyterphenyls with (T12-CN and T12-2CN) and without (T12) nitrile groups. These terphenyls were prepared through the Suzuki-Miyaura crosscoupling reaction using a palladium-based catalyst. The products obtained were analyzed as powders or after being drop-casted or spin-coated on glass. Nuclear Magnetic Resonance ( 1 H NMR) and Fourier Transform Infrared (FTIR) spectroscopy techniques confirmed the structure and purity of the synthesized terphenyls. The mesomorphic behavior was studied by differential scanning calorimetry (DSC), polarizing optical microscopy (POM), and X-ray diffraction (XRD). T12 developed various mesophases, whereas T12-CN and T12-2CN displayed one single mesophase of low order over a wide temperature range. The films topology was studied by AFM and the optical properties were determined by ultraviolet-visible (UV-Vis) spectroscopy and spectrofluorometry. Higher roughness was found for the films prepared with the asymmetric terphenyl (T12-CN). The photoluminescence (PL) spectrum obtained for the asymmetric terphenyl (T12-CN) exhibited the expected characteristics with an emission band centered at 381 nm and an overtone around 760 nm.

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Section: Introductionmentioning

confidence: 99%

Synthesis and Study of Chemical, Thermal, Mesomorphic, and Optical Properties of Terphenyls Modified with Nitrile Groups

González

Carrillo-Castillo

Ambrosio

et al. 2017

Journal of Chemistry

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Preparation and Electrochemical Behavior of Quinoxaline‐Bridged Diphenylamines

2021

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N-Phenylindroquinoxalines (PhIQs), which have a bridged diphenylamine structure, were synthesized and their physical and chemical properties were investigated. Syntheses of the materials were carried out by dehydration condensation between 4,5-disubstituted-1,2-phenylenediamine derivatives and N-phenylisatin. PhIQs showed fluorescent solvatochromism. PhIQs contain a diphenylamine moiety, but exhibit n-type properties due to the introduction of an electronegative quinoxaline unit. Introduction of substituents at the 2-and 3positions of PhIQ can regulate the reduction-oxidation potentials of the compound. The first reduction potential and fluorescent λ max vs. Hammett's σ p value has a good linear correlation.

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