Liquid crystal polymers as luminescent coatings: Single-component white-light photoluminescence and corrosion inhibition

Younis, Osama; Abdel-Hakim, Mohamed; Sayed, Marwa M.; Tsutsumi, Osamu; Aly, Kamal I.

doi:10.1016/j.jlumin.2021.118361

Cited by 18 publications

(9 citation statements)

References 65 publications

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“…On the other hand, Schiff bases are perfect candidates for photovoltaic solar cell, sensor, and organic light-emitting diode (OLED) applications; they can emit in a specific range. , Recently, we have reported some simple Schiff bases as luminescent coatings with white luminescence from a single chromophore . Moreover, studying the excited state and its correlation with the molecular structure or molecular aggregation can help us to specify the optical properties of the organic materials. − Some indole derivatives and other heterocyclic compounds have been designed and showed aggregation-induced emission properties. ,− Thus, Schiff bases with indole moieties may have some interesting optical properties. However, limited studies have exclusively examined such materials.…”

Section: Introductionmentioning

confidence: 99%

Base-Free Synthesis and Photophysical Properties of New Schiff Bases Containing Indole Moiety

et al. 2022

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Schiff bases represent an essential class in organic chemistry with antitumor, antiviral, antifungal, and antibacterial activities. The synthesis of Schiff bases requires the presence of an organic base as a catalyst such as piperidine. Base-free synthesis of organic compounds using a heterogeneous catalyst has recently attracted more interest due to the facile procedure, high yield, and reusability of the used catalyst. Herein, we present a comparative study to synthesize new Schiff bases containing indole moieties using piperidine as an organic base catalyst and Au@TiO 2 as a heterogeneous catalyst. In both methods, the products were isolated in high yields and fully characterized using different spectral analysis techniques. The catalyst was reusable four times, and the activity was slightly decreased. The presence of Au increases the number of acidic sites of TiO 2 , resulting in C=O polarization. Yields of the prepared Schiff bases in the presence of Au@TiO 2 and piperidine were comparable. However, Au@TiO 2 is an easily separable and recyclable catalyst, which would facilitate the synthesis of organic compounds without applying any hazardous materials. Furthermore, the luminescence behavior of the synthesized Schiff bases exhibited spectral shape dependence on the substituent group. Interestingly, the compounds also displayed deep-blue fluorescence with Commission Internationale de l’Éclairage (CIE) coordinates of y < 0.1. Thus, these materials may contribute to decreasing the energy consumption of the emitting devices.

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Section: Introductionmentioning

confidence: 99%

Base-Free Synthesis and Photophysical Properties of New Schiff Bases Containing Indole Moiety

et al. 2022

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“…The reaction-based damage detecting mechanisms are linked to material-specific or numerous components. Aggregation-induced emission (AIE) agents have been widely used in visual damage under specific laser irradiation. , Yao and co-workers synthesized an intelligent epoxy fluorescent resin with AIEgen TPE-2CH 2 Br. The obtained modified epoxy resin showed a strong fluorescence under UV light.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Smart Nanofiber Coatings with Autonomous Self-Warning and Self-Healing Functions

Cao

Wang

et al. 2022

ACS Appl. Mater. Interfaces

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Organic protective coatings are widely used to protect metal structures from corrosion but they are vulnerable to undetectable damage. Without timely detection and repair, it could lead to severe consequences. How to warn and heal damaged areas simultaneously and automatically has become a challenging problem. Herein, we report an intelligent protective coating with self-warning and self-healing functions. This strategy was achieved by embedding bifunctional nanofibers containing 1,10-phenanthroline (Phen) in organic coatings. The nanofibers with Phen as a core and a poly(vinyl alcohol) (PVA)chitosan (CS) blend solution as a shell were synthesized by coaxial electrospinning. The PVA/CS@Phen nanofiber-embedded coating displayed self-healing and high contrast indication function of the damaged area on coatings. Prominent red could warn microdamage and macrosurface damage, which occurred rapidly and healed permanently. The intelligent coating exhibited high healing performance under artificial injury with self-warning characteristics, and the cure rate was about 98.4% without external intervention. In the healing process, free amino groups of CS in the shell of nanofibers enhanced the sustained release of Phen. This convenient, economical, and efficient strategy with cooperative functions of self-warning and self-healing delivers an effective solution for prolonging the service life of protective coatings. This multifunctional coating exhibits excellent potential in the field of marine engineering applications.

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“…Single-molecular systems emitting white light have various benefits over multi-fluorescent molecule systems: Single-molecular systems eliminate the drawbacks of degradation, color aging, and phase separation; they also result in increased reproducibility and stability, as well as simplified device fabrication 12 – 14 . Recently, we have developed several single-component light-emitting materials 15 – 19 . Nevertheless, designing pure organic molecules with a dual emission that is appropriate for useful WOLEDs needs a clear understanding of the dual emission mechanism.…”

Section: Introductionmentioning

confidence: 99%

Combined experimental and TD-DFT/DMOl3 investigations, optical properties, and photoluminescence behavior of a thiazolopyrimidine derivative

Abozeed

Younis

Al‐Hossainy

et al. 2022

Sci Rep

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We present here the FT-IR, DFT computation, XRD, optical, and photophysical characterization of a heterocyclic compound with thienopyrimidine and pyran moieties. TD-DFT/DMOl3 and TD-DFT/CASTEP computations were used to study the geometry of isolated and dimer molecules and their optical behavior. The indirect (3.93 eV) and direct (3.29 eV) optical energy bandgaps, HOMO–LUMO energy gap (3.02 eV), and wavelength of maximum absorption (353 nm) were determined in the gas phase with M062X/6-31+G (d, p). A thin film of the studied molecule was studied using XRD, FT-IR, and UV–Vis spectroscopy. The average crystallite size was found as 74.95 nm. Also, the photoluminescence spectroscopy revealed that the compound exhibited different emission bands at the visible range with different intensities depending on the degree of molecular aggregation. For instance, solutions with different concentrations emitted blue, cyan, and green light. On the other hand, the solid-state material produced a dual emission with comparable intensities at λmax = 455, 505, and 621 nm to cover the entire visible range and produce white emission from a single material with CIE coordinates of (0.34, 0.32) that are very similar to the ideal pure white light. Consequently, these findings could lead to the development of more attractive new luminous materials.

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Liquid crystal polymers as luminescent coatings: Single-component white-light photoluminescence and corrosion inhibition

Cited by 18 publications

References 65 publications

Base-Free Synthesis and Photophysical Properties of New Schiff Bases Containing Indole Moiety

Base-Free Synthesis and Photophysical Properties of New Schiff Bases Containing Indole Moiety

Synthesis of Smart Nanofiber Coatings with Autonomous Self-Warning and Self-Healing Functions

Combined experimental and TD-DFT/DMOl3 investigations, optical properties, and photoluminescence behavior of a thiazolopyrimidine derivative

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