Dyes and Pigments

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ISSN / EISSN : 0143-7208 / 1873-3743
Published by: Elsevier BV (10.1016)
Total articles ≅ 9,742
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Meng-Qi Wang, Qian Wang, Meng Chen,
Published: 21 September 2021
Abstract:
Regulating the luminescence color of single fluorescent component via non-covalent interactions has attracted considerable attentions in recent years, as its dynamic and controllable nature is favorable to develop smart luminescent materials. Herein, a supramolecular photoluminescence system with tunable fluorescence emissions ranging from yellow to green was successfully fabricated by assembling a simple fluorescent molecule, 4-(pyren-1-yl)-1-(4-vinylbenzyl)pyridin-1-ium chloride (PPD), and cucurbit[n]uril (CB[n], n = 7, 8) via host-guest interactions. Upon this assembly, PPD possessed a dramatically enhanced emission efficiency as well as a longer fluorescence lifetime. Such dynamically controllable properties with tunable fluorescence emissions enabled PPD-based assembly to be applied as fluorescent ink and have a potential in information encryption material.
Lu Yang, Hao Lu, Ting Zhang, Shengyu Zhou, Xiaoyan Yang, Zhiwen Luo, Wei Huang, Yijun Shen, Guangbo Wang, Yingshuai Liu, et al.
Published: 21 September 2021
Abstract:
Levofloxacin (LVFX) is a fluoroquinolone antibacterial agent and widely used in the treatment of bacterial infections. However, the abuse of LVFX will do great harm to human being, and alkaline urine (pH > 7.0) with decreased solubility of LVFX will further cause adverse side effects. There is an urgent demand and great challenge to construct a mutlifunctional nano-system for the detection of LVFX and pH. We report a novel water-dispersible europium (Eu)-grafted covalent organic framework nanoplates ([email protected]) with luminescent characteristics of Eu3+. [email protected] shows high selective and sensitive luminescence sensing for LVFX with a limit of detection (LOD) at 0.51 μM. A visual test strip has been further designed and fabricated for on-site and rapid pH measurement with a detection range from 1 to 4 and 11 to 14. This proof-of-concept study not only reports a new type of luminescent LVFX and pH sensor, but also provides a promising strategy for the design of water-dispersible lanthanide-grafted luminescent CONs to further extends its application in chemo-biosensing.
Published: 21 September 2021
Abstract:
This work proposed to develop a portable, accessible, and objective solution for the reproduction of colors in medical-grade silicone elastomer by means of genetic algorithm and smartphones. The smartphones' application for color recipe prediction followed the two-constant Kubelka-Munk theory with corrections of internal and external reflection by Duntley, Saunderson and Richmond. The calculation of the composition of the mixture of pigments (n = 9) and flocking (n = 11) was performed by applying the genetic algorithm. Then, an intuitive application was developed for clinical use. The user sets the thickness and weight of the prosthesis and chooses a background option. The results screen displays the top five formulations generated by the genetic algorithm and their respective estimated color differences based on the CIELAB (ΔΕ) system under two illuminants (average sunlight and incandescent light). Simulations of color formulation were carried out and the estimated means of color difference were below the thresholds accepted clinically (ΔΕ < 3), but above the threshold of human visual perception for incandescent light (ΔΕ ≥ 1.1). So, different modifications on the algorithm were tested and the mean color difference was significantly improved (ΔΕ < 1.1). Though the mean value under average sunlight increased, it remained under the perceptive threshold. The methodology showed encouraging results and points out the potential use of smartphones to assist the clinician during the color formulation and to reduce costs.
Lihua Ma, Ping Wang, , , Zhi-Ming Zhang, , Tong-Bu Lu
Published: 20 September 2021
Abstract:
In natural photosynthetic system, sunlight is harvested by chlorophyll, subsequent funneling of the excitation energy to redox centers to trigger redox reaction. In contrast, the functions of light absorption, intersystem crossing and redox reaction were integrated into a single species (i.e. Ru(bpy)32+) in traditional catalytic system. Inspired by nature, we explore a strategy to introduce the strong absorbing dyes into Ru redox center and regulate their excited states by increasing the π-conjugation of dyes to afford a series of Ru(II) complexes-chromophore dyads (Ru-1 – Ru-5). Experimental and theoretical investigations reveal a forward singlet energy transfer following a backward triplet energy transfer between chromophore/Ru center in Ru-5, presenting a bidirectional sensitization, which not only achieve the functional separation among components in photosensitizer but also promote the efficient collaboration between Ru(II) center and chromophore. Remarkably, Ru-5 exhibited a strong visible light absorption at 463 nm (ε = 50500 M−1cm−1) and its triplet lifetime reached to 122.5 μs, over 400 times longer than the single component complex Ru-1. These advantages enable Ru-5 a significantly higher catalytic activity than the typical Ru(bpy)32+ for both energy- and electron-transfer reactions. This work opens up a new avenue to improve photosensitization for efficient photosynthesis by learning from nature.
Xiaoxia Chen, Xiaoqin Huang, Gang Liu, Yayi Tu, , Shouzhi Pu
Published: 20 September 2021
Abstract:
Here, a coumarin-based probe 4-chloro-3-formyl-2-oxo-2H-chromen-7-yl acrylate (named CFCA), which performed high efficient and specific recognition for cysteine (Cys), was successfully synthesized and characterized by NMR and MS. The CFCA probe showed colorimetric and “turn-on” fluorescent signals to Cys, and its color changes could be recognized by naked-eye. CFCA responded to Cys with the characteristics of rapid response time (less than 40 s), high selectivity, and excellent anti-interference. Among all kinds of samples, only Cys could significantly enhance the fluorescence intensity of the solution, which was not affected by the presence of other interferences. At the same time, within a certain concentration range, there was a good linear relationship between relative intensity of fluorescence and Cys concentration. The detection limit has been calculated to be as low as 0.33 μM. And the sensing mechanism of CFCA with Cys has been well confirmed by 1H NMR and HR-MS spectra. Moreover, the fluorescence probe CFCA was successfully used for imaging Cys in living cells and processed into test strips for on-site analysis and testing.
Quanyong Yi, Junhao He, Xiangxiang Fu, Jianing Ying, Luhang Gong, ,
Published: 20 September 2021
Dyes and Pigments, Volume 196; https://doi.org/10.1016/j.dyepig.2021.109816

Abstract:
Hydrazine (N2H4) is a widely used propellent in spacecraft propulsion, a chemical catalyst, a common precursor to several pharmaceuticals, and a big threat to human and animal health. Overexposure to it can cause a series of diseases, which underlies the importance of developing an effective probe for monitoring its levels. Herein, a carbazole-based novel ratiometric and colorimetric chemosensor, PCC-EC, was successfully developed and well-characterized. PCC-EC has demonstrated ratiometric blue-shifted fluorescent response to hydrazine, which induced naked-eye color and fluorescent color change, respectively. Besides, PCC-EC realized a highly sensitive and selective response to hydrazine in multiple model systems ranging from aqueous solutions, water samples, zebrafish, and mung bean sprouts, even imaging in choroidal melanoma cells of the human eye cells with a rapid response, good cell/tissue permeability, low cytotoxicity, and a wide pH-working range. We also created a simple paper strip system to facilitate the quick detection of hydrazine. The sensing mechanism of PCC-EC has been explored by DFT calculations and mass spectrometry. Overall, PCC-EC employs a rarely-reported strategy in sensing hydrazine and its successful application in multiple biological and environmental systems highlights its good application potential in the future.
Yitong Wang, Na Xu, , Xuqiong Xiao, Zheng Xu, ,
Published: 20 September 2021
Abstract:
π-conjugated systems containing boron have emerged as exciting subjects in contemporary organic materials chemistry. A number of fascinating organoboron materials have been reported, however, knowledge of how the substituents on the boron affect electronic properties is inadequate. Herein, three new C, N chelates were designed, changing the substituent at boron led to the formation of tetra- and tri-coordinated systems that have distinct electronic structures and photophysical properties. The fluorophores containing different coordinate boron atom always exhibited distinctive optical properties, however, the exploration of the influence of the boron substituent on the molecular structures and electronic properties is inadequate. Herein, three new C, N chelates were designed, changing the substituent at boron led to the formation of tetra- and tri-coordinated systems that have distinct electronic structures and photophysical properties.
, Francine I. Vacchi, Amanda dos Santos, Gisela De Aragão Umbuzeiro,
Published: 20 September 2021
Abstract:
As a new approach to permanent/oxidative hair dyes, we demonstrated that certain monoazo dyes containing substituents that enable diffusion into hair fibers and subsequent chelation/complexation using benign metal ions (Al3+ and Fe3+), rather than a harsh oxidant and strong alkali, merit consideration in this application area. This is important, because billions of individuals worldwide color their hair using permanent hair dye products that can contain aromatic amines and phenols that display genotoxicity and/or skin sensitization (e.g., para-phenylenediamine, PPD). Herein, our work is extended to an examination of the toxicological properties and durability of metallizable monoazo dyes, in comparison to a commercially used permanent hair dye product. Results from the Salmonella/microsome mutagenicity assay and from acute toxicity tests using aquatic test organisms (Daphnia similis, 48-h and Parhyale hawaiensis, 96-h) indicated that the proposed dyes were significantly less toxic than the top-eight permanent hair dye precursors utilized annually. Regarding durability, monoazo dye chelation in situ led to a higher degree of resistance to removal by washing than a commercial permanent hair dye. Taken together, these results further demonstrate the potential of the dyes as sustainable alternatives to conventional permanent hair dyes.
Sikun Zhang, Xu Liu, Guoping Li, Shi Yu, Ni Yan,
Published: 20 September 2021
Abstract:
Two kinds of dithienoazaborine viologen derivatives (3a and 3b) with different π-conjugated extensions were synthesized via late-stage functionalization of dithienoazaborine precursor (BNDT). In sharp contrast to 3a (conjugation I), 3b (conjugation II) showed red-shifted absorption (∼468 nm), narrower optical bandgap (2.65 eV), and aggregation-induced emission (AIE) property. Meanwhile, 3b-based electrochromic device (ECD) showed longer switching times (21.6 s for colouration and 34.9 s for bleaching), higher color contrast ratios (21.3%), higher coloration efficiency (13.29 cm2/C), as well as better stability compared with 3a-based ECD. In addition, an electronic information (E-information) tag and a flexible ECD were assembled using 3b, further manifesting its potential applications in display areas. The research not only expands the structural types of viologen derivatives but also compares the effects of different conjugation on the properties of viologen derivatives for the first time, which may provide a feasible way to design new electrochromic materials.
QianYi Wang, Weiquan Ke, Hengyi Lou, Yihui Han,
Published: 20 September 2021
Abstract:
Lead (Pb2+) ion, as a heavy metal pollutant in water, is harmful to human health, and may cause various diseases. Therefore, it is of great necessity for people to find a new and quick way to detect Pb2+ ions in water. Based on this condition, a zinc porphyrin-based metal-organic framework (ZnTCPP-MOF) with aggregation-induced emission (AIE) was successfully synthesized via coordination polymerization of zinc (Zn2+) ions, H2TCPP and TPE-2COOH, and shows a great fluorescent phenomenon which can be used as a fluorescent probe to detect metal ions in aqueous solution. So, the ZnTCPP-MOF with a highly selective and sensitive property can be employed to detect Pb2+ ions. The experiment results exhibit that the color change of ZnTCPP-MOF could be directly discovered from bright red to colorless after adding Pb2+ ions by naked eyes. Meanwhile, the quenching curves, at lower concentrations of Pb2+ ions, exhibited an excellent linear relationship between fluorescence quenching efficiency and concentrations. The highlight of this study is that the ZnTCPP-MOF could explore Pb2+ ions in water, at very low concentrations, as well as the limit of detection (LOD) is 4.99×10−8 M which is an excellent data, compared with other MOFs.
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