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Colorants
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Feature Papers in Colorant Chemistry
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Feature Papers in Colorant Chemistry

A special issue of Colorants (ISSN 2079-6447).

Deadline for manuscript submissions: 31 December 2024 | Viewed by 5331

Special Issue Editor

Prof. Dr. Anthony Harriman

E-Mail Website
Guest Editor
School of Natural and Environmental Sciences, Newcastle University, Newcastle upon Tyne NE1 7RU, UK
Interests: photophysics; optical spectroscopy; dye chemistry; kinetics; energy and electron transfer; physical chemistry
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

We are pleased to announce the Special Issue entitled “Feature Papers in Colorant Chemistry”. We are keen to receive and publish high-quality submissions on any subject relevant to this important field, especially articles concerning structure–colour relationships and applications in sophisticated technologies. The topics of this Special Issue include, but are not limited to, the following:

  • Synthesis and characterisation of new chromophores;
  • Functional dyes for advanced technologies;
  • Quantum chemistry applied to conjugated molecules;
  • Chromophore–chromophore interactions;
  • Establishing structure–colour relationships;
  • Design of interactive molecular arrays;
  • Advances in optical spectroscopy;
  • Photonic crystals.

We encourage researchers to submit original research articles, reviews, and communications. For well-prepared papers and those approved for further publication, authors may be eligible for discounts for publication.

Prof. Dr. Anthony Harriman
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Colorants is an international peer-reviewed open access quarterly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1000 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • structure–colour relationships
  • resonance theory
  • excitonic coupling
  • extended pi-conjugation
  • push–pull chromophores
  • poly(pyrrolic) dyes
  • cyanine dyes
  • stable free radicals
  • organic triplet sensitisers
  • solid-state emitters
  • super-resolution microscopy
  • opto-electronic devices
  • artificial light-harvesting arrays
  • chemical sensors
  • NIR absorbers
  • single-molecule emitters

Published Papers (6 papers)

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Research

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12 pages, 2417 KiB  
Article
Solid-State Luminescence with a Large Stokes Shift in Starch Functionalized with Low-Content ESIPT Dye
by Emerson Colonetti, Lilian C. da Luz and Fabiano S. Rodembusch
Colorants 2024, 3(2), 99-110; https://doi.org/10.3390/colorants3020007 - 03 Apr 2024
Viewed by 436
Abstract
Herein, we present the preparation of solid-state photoactive starches with a large Stokes shift, along with the resulting materials. In this investigation, 2-(2′-hydroxyphenyl)benzazole derivatives responsive to intramolecular proton transfer in the excited state (ESIPT) were covalently bonded to the polymeric structure of starch [...] Read more.
Herein, we present the preparation of solid-state photoactive starches with a large Stokes shift, along with the resulting materials. In this investigation, 2-(2′-hydroxyphenyl)benzazole derivatives responsive to intramolecular proton transfer in the excited state (ESIPT) were covalently bonded to the polymeric structure of starch through a reaction involving an isothiocyanate group and the hydroxyl groups of starch. These compounds exhibit absorption at approximately 350 nm, which is related to fully spin- and symmetry-allowed π → π* electronic transitions, and solid-state fluorescence at approximately 500 nm, which features a significant separation between the absorption and emission maxima (~9000 cm−1). Due to the minimal use of fluorophores in functionalized starch preparation, this modification does not affect the original properties of the starch. Finally, photoactive starch-based films with significantly high transparency were successfully produced. Full article
(This article belongs to the Special Issue Feature Papers in Colorant Chemistry)
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11 pages, 4875 KiB  
Article
Synthesis of High Near-Infrared Reflective Black Pigment Based on YMn2O5
by Kazuki Yamaguchi, Satoru Mochizuki, Yudai Nagato, Takuro Morimoto and Toshiyuki Masui
Colorants 2023, 2(4), 705-715; https://doi.org/10.3390/colorants2040036 - 06 Dec 2023
Viewed by 839
Abstract
Y(Mn0.95M0.05)2O5 (M = Al, Fe, Ga, Ti, and Zr) samples were synthesized via a sol–gel method using citric acid to find a new near-infrared (NIR) reflective black pigment. Among these samples, the optical reflectance of Y(Mn [...] Read more.
Y(Mn0.95M0.05)2O5 (M = Al, Fe, Ga, Ti, and Zr) samples were synthesized via a sol–gel method using citric acid to find a new near-infrared (NIR) reflective black pigment. Among these samples, the optical reflectance of Y(Mn0.95Fe0.05)2O5 and Y(Mn0.95Ga0.05)2O5 in the near-infrared region was found to be larger than that of YMn2O5. Then, the concentration of the dopant (Fe or Ga) was changed between 0 and 15%, and the resulting UV–Vis–NIR reflectance spectra were measured. As a result, the optical reflectance of the Fe-doped samples decreased in the near-infrared region, while that of the Ga-doped samples increased. Accordingly, Y(Mn1−xGax)2O5 (0 ≤ x ≤ 0.20) samples were synthesized, and the crystal structure, particle size, optical properties, and color of the samples were characterized. The single-phase samples were obtained in the composition range of 0 ≤ x ≤ 0.15, and the lattice volume decreased with increasing Ga3+ concentration. Optical absorption below 850 nm was attributed to the charge transfer transition between O2p and Mn3d orbitals, and the absorption wavelength of Y(Mn1−xGax)2O5 shifted to the shorter wavelength side as the Ga3+ content increased, because of the decrease in the Mn3+ concentration. Although the sample color became slightly reddish black by the Ga3+ doping, the solar reflectance in the near-infrared region reached 47.6% at the composition of Y(Mn0.85Ga0.15)2O5. Furthermore, this NIR reflectance value was higher than those of the commercially available products (R < 45%). Full article
(This article belongs to the Special Issue Feature Papers in Colorant Chemistry)
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13 pages, 9116 KiB  
Article
Repurposing the Strontium Ranelate Antiosteoporotic Drug as a New Outstanding Biocompatible Blue Dye
by Luca M. Sihn, Erick L. Bastos, Marcelo Nakamura, Mayara K. Uchiyama and Henrique E. Toma
Colorants 2023, 2(3), 578-590; https://doi.org/10.3390/colorants2030029 - 13 Sep 2023
Viewed by 840
Abstract
Blue dyes are relatively uncommon in nature, and a novel dithiophene dye (RanB) is reported in this paper. This dye is derived from an old anti-osteoporotic drug and is a metal ion complexing agent, displaying a planar molecular structure, with two sets of [...] Read more.
Blue dyes are relatively uncommon in nature, and a novel dithiophene dye (RanB) is reported in this paper. This dye is derived from an old anti-osteoporotic drug and is a metal ion complexing agent, displaying a planar molecular structure, with two sets of carboxylate, isonitrile, thiophene, and iminodiacetate groups. The blue color originates from a strong absorption peak at 648 nm, accompanied by an unusual fluorescence at 555 nm, with higher energy compared to the main absorption band. RanB forms complexes with lanthanoid ions through the iminodiacetate groups and serves as an effective sensitizer for Tb3+ ions, heightening their emission and improving their use as luminescent agents. Its photo-physical properties and the interaction with Tb3+ have been investigated using absorption spectroscopy, steady-state and time-resolved fluorescence spectroscopy, along with computational methods (ZINDO/S and DFT). The RanB toxicity in human umbilical vein endothelial cells has also been tested, showing a lack of toxicity, holding promising prospects for application as a luminescent and coloring agent in pharmaceuticals and food. Full article
(This article belongs to the Special Issue Feature Papers in Colorant Chemistry)
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13 pages, 1764 KiB  
Article
Adsorption Process of Methyl Orange Dye onto Zinc Hydroxide Nitrate: Kinetic and Thermodynamic Studies
by Daiane Amaral de Ramos Nogueira, Tânia Marina Palhano Zanela, Monielly Viomar Machado, Carlos Alberto Policiano Almeida and Rafael Marangoni
Colorants 2023, 2(3), 565-577; https://doi.org/10.3390/colorants2030028 - 06 Sep 2023
Viewed by 896
Abstract
Zinc hydroxide nitrate (ZHN) was used as an anionic adsorbent for the removal of methyl orange (MO) dye from aqueous solutions. ZHN was characterized via X-ray diffraction (XRD) and infrared spectroscopy (FTIR) techniques. Investigations were carried out to see how the adsorption of [...] Read more.
Zinc hydroxide nitrate (ZHN) was used as an anionic adsorbent for the removal of methyl orange (MO) dye from aqueous solutions. ZHN was characterized via X-ray diffraction (XRD) and infrared spectroscopy (FTIR) techniques. Investigations were carried out to see how the adsorption of MO was affected by factors such as initial MO concentration, contact time and temperature. Adsorption isotherms were analyzed using the Langmuir and Freundlich equations, with the first one being the better result for the equilibrium data. Adsorption kinetics was studied through applying pseudo-first and pseudo-second-order kinetic models, and the experimental data were better fitted to the pseudo-second-order model. The activation energy was determined using the Arrhenius equation to be 105.45 kJ mol−1, revealing the chemical nature of the adsorption process. The thermodynamic parameters were also determined, showing the adsorption of MO onto ZHN to be a non-spontaneous and exothermic process. The experimental results showed ZHN as a potential adsorbent with adsorption capacity for removing anionic dyes from water medium. Full article
(This article belongs to the Special Issue Feature Papers in Colorant Chemistry)
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13 pages, 4946 KiB  
Article
Enhanced Dyeing of Polypropylene Using Fluorine–Oxygen Gas Mixtures
by Masanari Namie, Jae-Ho Kim and Susumu Yonezawa
Colorants 2023, 2(3), 552-564; https://doi.org/10.3390/colorants2030027 - 31 Aug 2023
Viewed by 1040
Abstract
Surface fluorination with pure F2 gas can easily make the surface on PP (polypropylene) hydrophobic, and it causes limited dyeability, as reported in a previous paper. In this study, to produce a more hydrophilic surface, surface fluorination of PP was performed at [...] Read more.
Surface fluorination with pure F2 gas can easily make the surface on PP (polypropylene) hydrophobic, and it causes limited dyeability, as reported in a previous paper. In this study, to produce a more hydrophilic surface, surface fluorination of PP was performed at 25 °C, total gas pressure of 13.3 kPa, and reaction time of 1 h using F2 and O2 mixtures with different proportions of F2 gas. The surface roughness of the fluorinated PP samples was about 1.5 times higher than that of the untreated sample (5 nm). Fourier-transform infrared spectroscopy and X-ray photoelectron spectroscopy (XPS) results showed that the PP-derived bonds (-C-C- and -CHx) decreased because they were converted into polar groups (-C–O, -CHF-, and -CFx), which increased the surface electronegativity of the PP. The variation in the F2 gas proportion in the gas mixture significantly affected the hydrophilicity and surface composition of the PP. At F2 gas proportions of <70%, the hydrophilicity of the fluorinated PP samples was increased. Notably, the hydrophilic and negatively charged PP surface enhanced the dyeing of the polymer with basic methylene blue (MB). In contrast, at F2 gas proportions of >90%, the PP surface became hydrophobic owing to increased numbers of hydrophobic -CF3 bonds. Thus, enhanced PP dyeing can be controlled based on the composition of the F2 and O2 gas mixture. Full article
(This article belongs to the Special Issue Feature Papers in Colorant Chemistry)
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Review

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16 pages, 5529 KiB  
Review
Bimetallic Fenton-like Catalysts in the Remediation of Dyes
by Lydia R. Milam and Roy P. Planalp
Colorants 2024, 3(1), 1-16; https://doi.org/10.3390/colorants3010001 - 21 Dec 2023
Viewed by 572
Abstract
Remediation of organic dyes in natural waters is a significant environmental need under active study. This review analyzes bimetallic catalytic degradation systems that are based on the Fenton chemistry concept and that generate reactive oxygen species (ROS) as the agent of dye breakdown. [...] Read more.
Remediation of organic dyes in natural waters is a significant environmental need under active study. This review analyzes bimetallic catalytic degradation systems that are based on the Fenton chemistry concept and that generate reactive oxygen species (ROS) as the agent of dye breakdown. Recently developed advanced oxidation processes (AOPs) take advantage of bimetallic heterogeneous catalysts to facilitate rapid rates and full degradation. Catalysts based on two metals including iron, copper, molybdenum, cobalt and magnesium are discussed mechanistically as examples of effective radical ROS producers. The reactive oxygen species hydroxyl radical, superoxide radical, sulfate radical and singlet oxygen are discussed. System conditions for the best degradation are compared, with implementation techniques mentioned. The outlook for further studies of dye degradation is presented. Full article
(This article belongs to the Special Issue Feature Papers in Colorant Chemistry)
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