Dyes and Pigments最新文献

{"title":"Strong and pH dependent fluorescence in unprecedented anthra[2,3-d]imidazole derivatives","authors":"Emmanuele Parisi ,&nbsp;Emanuela Santagata ,&nbsp;Alessandro Landi ,&nbsp;Roberto Centore ,&nbsp;Marco Chino ,&nbsp;Antonio Carella","doi":"10.1016/j.dyepig.2024.112440","DOIUrl":"10.1016/j.dyepig.2024.112440","url":null,"abstract":"<div><p>We here report the synthesis and characterization of three new molecules based on an unprecedented anthra [2,3-<em>d</em>]imidazole unit. The new heterocycle was unexpectedly formed while attempting to obtain 2,3-diacetamidoanthracene by reducing the corresponding anthraquinone molecules by sodium borohydride. The same reaction was successfully performed using two further different 2,3-diamidoanthraquinone derivatives, thus confirming its generality. The chemical identity of the novel molecules was also proved by realizing single crystals suitable for XRD diffraction and solving the crystalline structure of one of the prepared systems. All the molecules are strong blue emitters in ethanol, with fluorescence quantum yields around 0.40. Because of the acid-base properties of anthraimidazole ring, the optical response was investigated at different pH values. While slight differences were observed in acidic conditions, in the alkaline pH range we observed a dramatic change of the fluorescence spectra in a narrow pH range (from 11 to 13), with the color of the emission turning from blue to green. This feature makes the new class of derivatives here reported very promising as pH sensors working in strongly alkaline conditions.</p></div>","PeriodicalId":302,"journal":{"name":"Dyes and Pigments","volume":"232 ","pages":"Article 112440"},"PeriodicalIF":4.1,"publicationDate":"2024-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0143720824005060/pdfft?md5=cd850d92dcf01a76f68f9e790d48326b&pid=1-s2.0-S0143720824005060-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142162986","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"NIR fluorescence of phenol-π-malononitrile derivatives achieved by extending π-bridge and unexpected intermolecular deprotonation","authors":"Chunlai Yang ,&nbsp;Ying Zou ,&nbsp;Saihao Ding ,&nbsp;Shuting Fan ,&nbsp;Xinying Xu ,&nbsp;Sunbowen Zhao ,&nbsp;Yifu Huang ,&nbsp;Hefeng Zhang","doi":"10.1016/j.dyepig.2024.112438","DOIUrl":"10.1016/j.dyepig.2024.112438","url":null,"abstract":"<div><p>NIR fluorescent phenol-π-malononitrile derivatives were achieved by extending vinylene π-bridge through Wittig reaction and following Knoevenagel condensation. In addition to regular D-A effect, unexpected intermolecular deprotonation of phenol group triggered by an electron-withdrawing group on phenyl ring pushed emissions to 762 nm with a large Stokes shift up to 323 nm. The extending of π-bridge and unexpected intermolecular deprotonation of phenol group promised a feasible strategy for construction of low-molecular weight NIR fluorophores.</p></div>","PeriodicalId":302,"journal":{"name":"Dyes and Pigments","volume":"232 ","pages":"Article 112438"},"PeriodicalIF":4.1,"publicationDate":"2024-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142173214","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A novel triphenylamine-based fluorescent probe for high selectivity and sensitivity detection of UO22+ in water samples and living cells","authors":"Yibin Zhang ,&nbsp;Wanxia Gao ,&nbsp;Na Zhao ,&nbsp;Meihui Wu ,&nbsp;Tong Wu ,&nbsp;Xingyu Zhang ,&nbsp;Jingran Wang ,&nbsp;Chen Wang ,&nbsp;Jinting Shang ,&nbsp;Xiji Shu","doi":"10.1016/j.dyepig.2024.112436","DOIUrl":"10.1016/j.dyepig.2024.112436","url":null,"abstract":"<div><p>Here, we report a novel triphenylamine-based fluorescent probe <strong>AIU</strong> for detecting UO₂²⁺. The probe <strong>AIU</strong> exhibited good selectivity, low detection limit (67 nm), and rapid response time(80s). The coordination mechanism of <strong>AIU</strong> toward UO₂²⁺ was investigated through theoretical calculations and other methods such as HPLC-MS. Moreover, <strong>AIU</strong> has demonstrated efficacy in detecting UO₂²⁺ in real water samples and in living cells.</p></div>","PeriodicalId":302,"journal":{"name":"Dyes and Pigments","volume":"232 ","pages":"Article 112436"},"PeriodicalIF":4.1,"publicationDate":"2024-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142230057","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Investigation of heavy atom effects and pH sensitivity on the photocatalytic cross-dehydrogenative coupling reaction of halogenated fluorescein dyes","authors":"Tingwei Cai ,&nbsp;Hanchang Hu ,&nbsp;Qiangqiang Zhao ,&nbsp;Zhong Zhang ,&nbsp;Jinxin He","doi":"10.1016/j.dyepig.2024.112437","DOIUrl":"10.1016/j.dyepig.2024.112437","url":null,"abstract":"<div><p>Fluorescein halogenated dyes are excellent photocatalysts for cross-dehydrogenation-coupled (CDC) reaction. In this paper, seven different halo-fluorescein dyes were selected to investigate the influence of heavy halogen atoms and proton concentrations on halo-fluoresceins for photocatalytic CDC reaction. The results showed that the heavy atoms directly affected intersystem crossing (ISC), which could act as a gatekeeper in the photoredox cycle and also affect photoinduced electron transfer (PET) process. Thus, the photocatalytic performance clearly increased in the following order: fluorescein <strong>FL</strong> (0.11 mol L⁻¹•h⁻¹)＜dibromo-fluorescein <strong>FL-2Br</strong> (0.19 mol L⁻¹•h⁻¹)＜diiodo-fluorescein <strong>FL-2I</strong> (0.29 mol L⁻¹•h⁻¹)＜tetrabromo-fluorescein <strong>FL-4Br</strong> (0.375 mol L⁻¹•h⁻¹)＜tetrabromo-tetrachloro-fluorescein <strong>FL-4Br–4Cl</strong> (0.53 mol L⁻¹•h⁻¹)＜tetraiodo-fluorescein <strong>FL-4I</strong> (0.58 mol L⁻¹•h⁻¹)＜ tetraiodo-tetrachloro-fluorescein <strong>FL-4I–4Cl</strong> (0.74 mol L⁻¹•h⁻¹). Furthermore, the visible light absorption of halogenated fluorescein dyes varied significantly with pH, thereby affecting their photocatalytic activity of CDC reaction. The dianionic <strong>FL-4I–4Cl</strong> could fully absorb light energy and exhibit excellent photocatalytic performance under mildly alkaline conditions (pH = 8), achieving a CDC reaction conversion rate of 99.92 %, which was 2.6 times higher than that of the lactone form of <strong>FL-4I–4Cl</strong> under acidic conditions (pH = 2).</p></div>","PeriodicalId":302,"journal":{"name":"Dyes and Pigments","volume":"232 ","pages":"Article 112437"},"PeriodicalIF":4.1,"publicationDate":"2024-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142274113","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"1,1-Difluoro-1,3,5,2-triazaborinines containing benzo-fused imidazo-, oxazolo-, and thiazolo-pyrimido as a new luminescent framework","authors":"Ricardo R.C. Cassol ,&nbsp;Fábio M. Luz ,&nbsp;Érica T.O. Machado ,&nbsp;Victor S. Pereira ,&nbsp;Clarissa P. Frizzo ,&nbsp;Marcos A.P. Martins ,&nbsp;Nilo Zanatta ,&nbsp;Victor M. Deflon ,&nbsp;Rafaela C. Cunha ,&nbsp;Bernardo A. Iglesias ,&nbsp;Helio G. Bonacorso","doi":"10.1016/j.dyepig.2024.112435","DOIUrl":"10.1016/j.dyepig.2024.112435","url":null,"abstract":"<div><p>In this paper, we present for the first time an efficient method for synthesizing three novel tetra–coordinated BF₂ complexes, specifically 6,6-difluoro-2,4-dimethyl-6<em>H</em>-5λ⁴,6λ⁴-benzo [4,5]imidazo(oxazolo/thiazolo)[3,2-<em>c</em>]pyrimido [2,1-<em>f</em>][1,3,5,2]triazaborinines (<strong>4a–c</strong>). These compounds were synthesized via the reaction of selected <em>N</em>-(4,6-dimethylpyrimidin-2-yl)-benzo[<em>d</em>]imidazo(oxazolo/thiazolo)-2-amines (<strong>3a–c</strong>) with BF₃·OEt₂, employing Et₃N as a base. Optimized yields ranging from 64 to 69 % were achieved when the reactions were conducted in anhydrous CHCl₃ at room temperature for 24 h. The structural elucidation of BF₂ complexes <strong>4a-c</strong> was performed through multinuclear NMR, FTIR, SC-XRD, and HRMS techniques. These compounds demonstrated thermal stability up to 150 °C as evidenced by thermogravimetric analysis. The spectroscopic properties (in both solution and solid states) and the electrochemical properties of the synthesized derivatives were thoroughly investigated using UV–Vis spectroscopy, steady-state, time-resolved fluorescence emission, TD-DFT calculations, and redox potential measurements. The results of this study highlighted a dependence of the compounds’ properties on the heteroatom (NH, O, or S) present within the heterocyclic skeleton.</p></div>","PeriodicalId":302,"journal":{"name":"Dyes and Pigments","volume":"231 ","pages":"Article 112435"},"PeriodicalIF":4.1,"publicationDate":"2024-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142148582","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"TPA-DPP-based extended π-conjugated SMDs: Central core regulation on photovoltaic performance","authors":"Yajie Wang ,&nbsp;Chang Liu ,&nbsp;Lunxiang Yin,&nbsp;Yaru Liu,&nbsp;Peiwen Jiang,&nbsp;Yanqin Li","doi":"10.1016/j.dyepig.2024.112434","DOIUrl":"10.1016/j.dyepig.2024.112434","url":null,"abstract":"&lt;div&gt;&lt;p&gt;Small molecule donors (SMDs) have made great progress in the field of organic semiconductor materials due to their unique characteristics. The extended π-conjugation SMDs system combines the advantages of wide absorption and effective carrier mobility. However, the new structure of active layer material and the power conversion efficiency (PCE) of bulk-heterojunction (BHJ) organic solar cells (OSCs) are critical issues. Herein, a series of new SMDs, &lt;strong&gt;(TPA-DPP)&lt;/strong&gt;&lt;sub&gt;&lt;strong&gt;2&lt;/strong&gt;&lt;/sub&gt;&lt;strong&gt;-CZ&lt;/strong&gt;, &lt;strong&gt;(TPA-DPP)&lt;/strong&gt;&lt;sub&gt;&lt;strong&gt;2&lt;/strong&gt;&lt;/sub&gt;&lt;strong&gt;-PTZ&lt;/strong&gt; and &lt;strong&gt;(TPA-DPP)&lt;/strong&gt;&lt;sub&gt;&lt;strong&gt;2&lt;/strong&gt;&lt;/sub&gt;&lt;strong&gt;-PhFLU&lt;/strong&gt;, were constructed based on an extended D-A-D′-A-D structural skeleton using triphenylamine-diketopyrrolopyrrole (TPA-DPP) as the terminal electron-donating group and π-bridge electron-withdrawing linker. The strong push-pull effect of TPA-DPP leads to wide and strong light absorption, which is one of the reasons for the high short-circuit current density (&lt;em&gt;J&lt;/em&gt;&lt;sub&gt;SC&lt;/sub&gt;) of bulk heterojunction organic solar cells (OSCs). Furthermore, taking carbazole (CZ), phenothiazine (PTZ), and alkoxyphenyl substituted fluorene (PhFLU) as the central D′ units respectively, the effects of structural control strategies on the photovoltaic properties of the materials were discussed. It should be emphasized here that the introduction of alkoxyphenyl groups into the central core generates significant push-pull effects, promotes intermolecular charge transfer (ICT) processes, reduces energy loss, and facilitates charge transport in photovoltaic devices. As a result, the compounds &lt;strong&gt;(TPA-DPP)&lt;/strong&gt;&lt;sub&gt;&lt;strong&gt;2&lt;/strong&gt;&lt;/sub&gt;&lt;strong&gt;-CZ&lt;/strong&gt;, &lt;strong&gt;(TPA-DPP)&lt;/strong&gt;&lt;sub&gt;&lt;strong&gt;2&lt;/strong&gt;&lt;/sub&gt;&lt;strong&gt;-PTZ&lt;/strong&gt; and &lt;strong&gt;(TPA-DPP)&lt;/strong&gt;&lt;sub&gt;&lt;strong&gt;2&lt;/strong&gt;&lt;/sub&gt;&lt;strong&gt;-PhFLU&lt;/strong&gt; show high molar extinction coefficients ranging from 1.12 × 10&lt;sup&gt;5&lt;/sup&gt; M&lt;sup&gt;−1&lt;/sup&gt; cm&lt;sup&gt;−1&lt;/sup&gt; to 1.68 × 10&lt;sup&gt;5&lt;/sup&gt; M&lt;sup&gt;−1&lt;/sup&gt; cm&lt;sup&gt;−1&lt;/sup&gt;, which is helpful for devices based on these materials to obtain high &lt;em&gt;J&lt;/em&gt;&lt;sub&gt;SC&lt;/sub&gt;. Among the three compounds, &lt;strong&gt;(TPA-DPP)&lt;/strong&gt;&lt;sub&gt;&lt;strong&gt;2&lt;/strong&gt;&lt;/sub&gt;&lt;strong&gt;-PhFLU&lt;/strong&gt; obtained the lowest HOMO&lt;sup&gt;CV&lt;/sup&gt; energy level of −5.20 eV and the narrowest band gap of 1.65 eV, which will be conducive to the generation of high open circuit voltage (&lt;em&gt;V&lt;/em&gt;&lt;sub&gt;OC&lt;/sub&gt;) and &lt;em&gt;J&lt;/em&gt;&lt;sub&gt;SC&lt;/sub&gt;. The PCE of SMDs/PC&lt;sub&gt;71&lt;/sub&gt;BM-based OSCs ranged from 4.66 % to 7.44 %. It is worth noting that the &lt;strong&gt;(TPA-DPP)&lt;/strong&gt;&lt;sub&gt;&lt;strong&gt;2&lt;/strong&gt;&lt;/sub&gt;&lt;strong&gt;-PhFLU/&lt;/strong&gt;PC&lt;sub&gt;71&lt;/sub&gt;BM-based device obtained the highest PCE of 7.44 % with a &lt;em&gt;V&lt;/em&gt;&lt;sub&gt;OC&lt;/sub&gt; of 0.94 V, and a high &lt;em&gt;J&lt;/em&gt;&lt;sub&gt;SC&lt;/sub&gt; of 19.71 mA cm&lt;sup&gt;−2&lt;/sup&gt; without further optimization. The measured photocurrent and PCE of the device is one of the best performances for TPA-DPP-based SMDs ava","PeriodicalId":302,"journal":{"name":"Dyes and Pigments","volume":"231 ","pages":"Article 112434"},"PeriodicalIF":4.1,"publicationDate":"2024-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142148532","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Irradiation for improving Violet-Blue Light Contribution of tri- and Polychromatic Polysulfone Host-guest systems","authors":"Bernardo Monteiro ,&nbsp;Susete N. Fernandes ,&nbsp;Pedro M.R. Paulo ,&nbsp;Catarina Viola ,&nbsp;Cláudia C.L. Pereira","doi":"10.1016/j.dyepig.2024.112430","DOIUrl":"10.1016/j.dyepig.2024.112430","url":null,"abstract":"<div><p>Herein, we explored the effect of light irradiation on polysulfone films dopped with highly emissive guests. We report irradiation promoted interactions in a polysulfone membrane functionalized with a fluorinated β-diketone species leading to an improved Violet-Blue Light Contribution in Polychromatic Polysulfone Host-Guest Systems.</p><p>We suggest that irradiation at higher UV wavelengths, leads to an amorphous-to-monomer phase transformation of the fluorinated boron guest, BF₂dbm (dbm as dibenzoylmethanoate), to which corresponds conversion of part of the green emission from aggregates to cyan-blue fluorescence, characteristic of the monomeric form. Also, irradiation at lower wavelength promotes host-guest BF₂dbm@PSU strong interaction giving rise to increased emission in the violet-blue region by sacrificing the contribution from the intense blue-cyan emission from BF₂dbm molecules.</p><p>In the current work we also prepared combinations of Tb³⁺ and Eu³⁺ highly fluorinated complexes and evaluated its tuneable emission due to light driven ligand interaction with host matrix. The judicious choice of molecular ratio between Tb³⁺ and Eu³⁺ complexes allow rationally designed preparation of triple-emissive flexible films when irradiated at 300, 320 and 330 nm, to be used in highly advanced anti-counterfeiting technologies.</p><p>In short, we propose a simple and new powerful approach for emission colour tuning of polysulfone dopped films.</p></div>","PeriodicalId":302,"journal":{"name":"Dyes and Pigments","volume":"231 ","pages":"Article 112430"},"PeriodicalIF":4.1,"publicationDate":"2024-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142148531","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Interactions of iron(II) octacarboxyphthalocyanine with levamisole hydrochloride","authors":"Joanna Nackiewicz,&nbsp;Łukasz Kołodziej,&nbsp;Anna Poliwoda,&nbsp;Małgorzata A. Broda","doi":"10.1016/j.dyepig.2024.112432","DOIUrl":"10.1016/j.dyepig.2024.112432","url":null,"abstract":"<div><p>The interaction of veterinary drug levamisole hydrochloride (LEV-HCl) with iron(II) octacarboxyphthalocyanine (FePcOC) was studied by UV–Vis spectroscopy and density functional theory calculations (DFT, TD-DFT). It was shown that interaction with LEV caused bathochromic shift of the Q-band of FePcOC. Oxidation of LEV using H₂O₂ and FePcOC as catalyst showed that the main product was the disulphide dimer of a thiol decomposition product, being a result of a thiol ring opening, as shown through LCMS. Furthermore, a dihydroimidazole product of LEV ([M+H]⁺ 203.06), potentially arising from an imidazolidine ring dehydrogenation, was identified. The effect of the interaction effect with LEV on the molecular geometry of FePcOC was investigated at the M06-2X/6-31G+(d,p) level. TD-DFT calculations revealed a bathochromic shift of the FePcOC Q band due to the axial coordination via the nitrogen atom of levamisole.</p></div>","PeriodicalId":302,"journal":{"name":"Dyes and Pigments","volume":"231 ","pages":"Article 112432"},"PeriodicalIF":4.1,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142148530","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Partial substitution with furan units for modulating charge transport ability of regio-random polythiophene","authors":"Albert Buertey Buer ,&nbsp;Hae Jeong Kim ,&nbsp;Vivian Nketia-Yawson ,&nbsp;Hyungju Ahn ,&nbsp;Benjamin Nketia-Yawson ,&nbsp;Jongmin Choi ,&nbsp;Jea Woong Jo","doi":"10.1016/j.dyepig.2024.112433","DOIUrl":"10.1016/j.dyepig.2024.112433","url":null,"abstract":"<div><p>Random copolymerization is a promising strategy for finely modulating crystal, morphological, and electrical properties of semiconducting conjugated polymers for electronic device applications. Herein, a new series of regio-random thiophene polymers were synthesized by partially substituting non-alkylated furan units into the conjugated backbone to enhance the inter- and intramolecular interactions. The systematic tuning of the monomer ratio revealed the dramatic effects of furan substitution on the charge transport ability of the polymers. The optimized-polymer field-effect transistors showed enhanced mobility of over 4 cm²V⁻¹s⁻¹ compared to the control polymer with no furan substitution (≈2 cm²V⁻¹s⁻¹), using electrolyte gating, which substantially exceeds devices with conventional polymer dielectric (10⁻² cm²V⁻¹s⁻¹), attributing to improved charge carrier density in the semiconducting channel and film crystallinity. Also, using the synthesized polymers as hole transport materials for silver bismuth sulfide (AgBiS₂) nanocrystal solar cells showed high power conversion efficiencies of 5.75 % and 4.09 % for the optimized and control polymers, respectively. This study will provide new insight into improving the crystallinity of random polymers for high-performance solution-processable electronic devices.</p></div>","PeriodicalId":302,"journal":{"name":"Dyes and Pigments","volume":"231 ","pages":"Article 112433"},"PeriodicalIF":4.1,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142148581","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Synthesis of pH-responsive fluorescent carbon dots using waste leather scrap for anti-counterfeiting","authors":"Wenbo Zhang ,&nbsp;Wen Li ,&nbsp;Qi Wang ,&nbsp;Junfeng Zhang ,&nbsp;Li Li ,&nbsp;Zhijun Zhou ,&nbsp;Bin Lyu ,&nbsp;Jianzhong Ma","doi":"10.1016/j.dyepig.2024.112431","DOIUrl":"10.1016/j.dyepig.2024.112431","url":null,"abstract":"<div><p>The fabrication of carbon dots (CDs) with biomass materials has become one of the research hot spots. Waste leather scrap (WLS) has been proven to be practicable for the preparation of CDs with simple fluorescence properties for anti-counterfeiting because of their cheap and environmentally responsible characteristics. For a more complex and harder imitation of anti-counterfeiting, stimuli-responsive CDs with WLS as raw material are urgently needed. Herein, acid-responsive fluorescent carbon dots (L-CDs) and alkaline-responsive fluorescent carbon dots (H-CDs) were prepared from WLS via a simple one-step solvothermal/hydrothermal method with emission wavelengths of 457 nm and 549 nm, respectively. When decreasing or increasing the pH value, their emission wavelengths change to 633 nm and 424 nm, respectively. The CDs are highly fluorescence reversible (20 times) in a broad pH region. The detailed results indicated that CDs have the structure of graphite carbon and possess wealthy chemical groups, like C<img>O, –OH, C–N, etc. These are the main reasons for the change of emission wavelength. Due to the stable pH-responsiveness, the CDs were employed as fingerprint, ink, and figure code in anti-counterfeiting. The pH-responsive fluorescent CDs using WLS for anti-counterfeiting enrich the process of solid waste with a sustainable, cost-effective method for practical applications.</p></div>","PeriodicalId":302,"journal":{"name":"Dyes and Pigments","volume":"231 ","pages":"Article 112431"},"PeriodicalIF":4.1,"publicationDate":"2024-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142137398","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}