Dyes and Pigments最新文献

Hydrogen sulfide (H₂S) is involved in the regulation of a variety of physiological processes in living organisms, such as cell signaling, vascular tone regulation, and inflammatory response. The present focus of research is the progression of highly efficient and highly sensitive near-infrared hydrogen sulfide fluorescent probes, which is fueled by the extensive examination of the biological function of hydrogen sulfide. These probes are not only expected to advance the understanding of the biological functions of hydrogen sulfide, but also provide important tools and methods for drug discovery, disease diagnosis and treatment, and other fields. Therefore, this review summarize the recent research progress of near-infrared fluorescent probes for the recognition of hydrogen sulfide based on azide reduction, nucleophilic substitution, and nucleophilic addition reactions, and discussed their application prospects in the detection and imaging of hydrogen sulfide in living organisms. This review provides researchers with a comprehensive understanding of the current status and future development direction of hydrogen sulfide fluorescent probes. Moreover, it will contribute to the development of the field of life sciences.

In this study, we used a simple, cost-effective, and high-yield synthetic route to successfully synthesize two thiazolothiazole-based wide-bandgap donor polymers, namely TTZ and ANTTZ. We systematically investigated how the solubility, absorption and photoelectric properties of the materials were influenced by the position of ester group at the thiophene unit as π-bridge. Theoretical calculations, UV–vis spectroscopy and GIWAXS results revealed that TTZ possesses planar molecular backbone and higher crystallinity. Ultimately, with BTP-ec9-4F as the acceptor, the TTZ based devices can achieve an impressive power conversion efficiency (PCE) of 13.96%; whereas the ANTTZ based devices can give a PCE of only 3.07%. This research underscores the effectiveness of a cost-efficient donor material synthesis route and highlights the crucial influence of the side chain position on crystallinity of the polymer, offering a new direction for designing low-cost, high-efficiency photovoltaic materials.

Color filters play an important role in the quality of complementary metal–oxide–semiconductors and thin-film-transistor liquid-crystal displays. Although pigment nanoparticles have traditionally been used as color filter colorants, the use of molecular dyes for preparing high-quality color filters is an emerging strategy. However, few studies have investigated the relation between the structure of dyes and their color filter characteristics, such as solubility, and thermal stability and photostability. In this study, six phthalocyanine dyes with different branched substituents and central metals (zinc and copper) were developed. These dyes displayed high levels of solubility in propylene glycol monomethyl ether acetate (up to 40.8 wt%), high light transmission, and satisfactory thermal stability and photostability, indicating their potential application in color filters. They may provide a way to explore more molecular dyes for color filters with excellent dissolution properties.

Covalent C–C bonded macrocycle topologies have been attracting increasing attention owing to their structural diversity and various applications. However, the methods for constructing such structures are limited, with most relying on transition metal-catalysis or requiring stringent reaction conditions, highlighting the urgent need to explore innovative synthetic approaches. Hence, we report a stepwise Friedel-Crafts gridization catalyzed by BF₃·Et₂O under ambient conditions and air atmosphere for the synthesis of the multi-grid topological nanostructures 2G-AG (30% yield) and 3G-AG (8% yield). Furthermore, the non-planar and structurally more complex multi-grid topologies, 2G-AG and 3G-AG, exhibit stronger excimer emission. This study provides a novel method for designing and synthesizing complex macrocyclic topological nanostructures connected by covalent bonds and with optoelectronic functionality.

In the field of cultural heritage, understanding the nature of pigments and dyes is of great importance for conservation issues. Among the many natural dyes used in paintings or textiles, madder was one of the most important sources of red color at the time and was present in a wide variety of objects. However, due to extraction challenges, impurities, and high costs, a lot of information are not easily available. In this publication we designed a computational protocol able to reproduce the spectroscopic properties of two dyes, alizarin and alizarin red S. This framework allows us to compute both Ultraviolet–Visible absorption spectra and Nuclear Magnetic Resonance (NMR) with good accuracy as well as reproduce with precision the CIELAB color. We have also explored different types of interactions that impact these properties, notably the solvation effect. We found that microsolvation is sufficient to reproduce the experimental measurements made in water. The high accuracy of the computation method makes this technique particularly promising for a non-destructive study of dyes on works of art and the preservation of cultural heritage.

We previously synthesized a group of carbamate-linked disazo disperse dyes that showed excellent fastness properties on polyester fabric by using the thermosol dyeing process. However, the color yield of the dyed fabric was not sufficiently high to be accepted by users, especially when using a high-temperature dyeing process. To further optimize the structures of disazo disperse dyes and observe the effect of the linking groups on the dyeing properties, in this work, we used p-phenylene diisocyanate or terephthaloyl chloride as crosslinking agents and aniline derivatives containing hydroxyl or amino groups as reactants to synthesize four disazo disperse dyes containing various characteristic groups, including ester, carbamate, amide, and urea groups. The structures of these new dyes were characterized by nuclear magnetic resonance, mass spectrometry, and Fourier-transform infrared spectroscopy analyses. The spectral properties in an N,N-dimethylformamide solvent were measured, the structural parameters of the dyes were calculated using the density functional theory method, and the dyeing properties were investigated by using high-temperature and thermosol dyeing processes, and also compared with these for the commercial dye, C·I.Disperse Red 153. The results showed that there were slight differences in the molar extinction coefficients and maximum absorbance wavelengths between the new dyes, but the effects of characteristic groups on the structural features and the dyeing properties of the new dyes were significant. The ester-linked dye (D1) had the highest color depth when a high-temperature process was used in the presence of 50 mL/L of methyl salicylate because of its highest ClogP (N-octanol/water partition coefficient) value, corresponding to its more hydrophobic nature, while all the other dyes produced lower color yields. When used in the thermosol dyeing process, the carbamate-linked dye (D2) yielded the highest color depth, followed by the ester-linked dye (D1) and amide-linked dye (D3), and the urea-linked dye (D4) produced the lowest color depth due to its highest hydrophilic properties. Finally, it was demonstrated that the new dyes had excellent color fastnesses except for the urea-linked dye (D4), which exhibited a slightly lower light fastness, While the commercial dye used as the control showed a relatively poor sublimation and light fastness although its color depth and chroma value performed slightly better than the new dyes as used by the thermosol dyeing process.

Room-temperature phosphorescent (RTP) materials have attracted more and more attention due to their long luminescence life and large Stokes displacement. Host-guest doping systems are highly regarded for their simplicity of preparation and the absence of complex synthesis processes. Strong RTP emission can be activated by the doping of a guest molecules, in particular by substituting the phenyl group in the host structure with a naphthalene group. In this study, derivatives of benzophenone were constructed as the host molecule, and used 2-Benzoylnaphthalene, a commercially available naphthyl-substituted analogue of benzophenone, as the guest molecule. The phosphorescent lifetime of the doped system can reach 335 ms and the phosphorescent quantum yield can reach 58 %, which is expected to be used in anti-counterfeiting encryption, biological imaging and other fields. This work provides a general and effective host-guest doping strategy for constructing various organic room temperature phosphorescent materials.