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Functional Organic Dyes and Pigments

A special issue of Materials (ISSN 1996-1944).

Deadline for manuscript submissions: closed (15 July 2016) | Viewed by 10797

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Guest Editor
School of Science, University of the West of Scotland, Paisley PA1 2BE, UK

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Guest Editor
School of Life and Medical Sciences, University of Hertfordshire, Hatfield AL10 9NP, UK

Special Issue Information

Dear Colleagues,

Dyes and pigments are generally classified on the basis of their solubility. Pigments can be inorganic or organic, white, black or coloured materials that are insoluble in the medium in which they are applied. Dyes, on the other hand, are soluble and, as a consequence, lose their solid-state structural properties upon application. Given that both pigments and dyes are, in general, similar in terms of their chemical composition, it is in the nature of their physical properties that they are normally differentiated.

Organic dyes and pigments have been employed for centuries in the colouration and protection of antiquities. The discovery of Mauvine by Perkin in 1856 heralded the emergence of industrially produced colouration technologies, which have been developed and exploited over the last century, predominantly in areas such as textiles and coating effects. Historically, the “function” of dyes and pigments has focused on their interaction with light, specifically involving absorption and reflection processes.

More recently, a new class of materials, which have evolved from traditional colourants and which are described as “functional dyes and pigments”, has emerged with considerable impact. Owing to their extensive conjugated π-electron systems, many of these materials display unique electronic properties, particularly in the solid state, and as a consequence exhibit interesting optical and electronic behaviour. New technologies based on these materials involve novel interactions and the manipulation of light that encompass reversible photochemical and photophysical processes, involving absorption, emission, and energy transfer. Applications of these high performance conjugated systems are extensive and include imaging and modern printing technologies, such as electrophotography, thermal and ink-jet printing, and invisible imaging, such as optical data storage and security printing; display technologies, such as LCDs and OLEDs; electronic materials, such as organic semiconductors, OFETS, solar cell technologies, organic spintronics, electronic sensors, and molecular scale logic devices; diagnostics in the form of sensors based upon absorption and emission of light; biomedical application, such as photodynamic therapy; and non-linear optics and laser dyes.

There are many other technologies and applications involving functional dyes and pigments. The field is constantly expanding to embrace significant new areas of research and innovation in synthetic organic chemistry, solid-state chemistry, crystallography, photophysical and photochemical characterisation, application, device fabrication and theoretical modelling.

It is my pleasure to invite you to submit a manuscript for this Special Issue. Full papers, communications, and reviews are all welcome.

Dr. Callum McHugh
Dr. Jesus Calvo-Castro
Guest Editor

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Keywords

  • Dyes and Pigments
  • Semiconductors and OFETS
  • Fluorescence sensors
  • Imaging technologies, OLEDS
  • Dye sensitised solar cells

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Published Papers (2 papers)

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3318 KiB  
Article
Surface Structures Formed by a Copper(II) Complex of Alkyl-Derivatized Indigo
by Akinori Honda, Keisuke Noda, Yoshinori Tamaki and Kazuo Miyamura
Materials 2016, 9(10), 837; https://doi.org/10.3390/ma9100837 - 15 Oct 2016
Cited by 8 | Viewed by 5077
Abstract
Assembled structures of dyes have great influence on their coloring function. For example, metal ions added in the dyeing process are known to prevent fading of color. Thus, we have investigated the influence of an addition of copper(II) ion on the surface structure [...] Read more.
Assembled structures of dyes have great influence on their coloring function. For example, metal ions added in the dyeing process are known to prevent fading of color. Thus, we have investigated the influence of an addition of copper(II) ion on the surface structure of alkyl-derivatized indigo. Scanning tunneling microscope (STM) analysis revealed that the copper(II) complexes of indigo formed orderly lamellar structures on a HOPG substrate. These lamellar structures of the complexes are found to be more stable than those of alkyl-derivatized indigos alone. Furthermore, 2D chirality was observed. Full article
(This article belongs to the Special Issue Functional Organic Dyes and Pigments)
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2223 KiB  
Article
Photoassisted Electrochemical Treatment of Azo and Phtalocyanine Reactive Dyes in the Presence of Surfactants
by Mireia Sala, Víctor López-Grimau and Carmen Gutiérrez-Bouzán
Materials 2016, 9(3), 211; https://doi.org/10.3390/ma9030211 - 18 Mar 2016
Cited by 12 | Viewed by 4889
Abstract
An electrochemical treatment (EC) was applied at different intensities to degrade the chromophoric groups of dyes C.I. Reactive Black 5 (RB5) and C.I. Reactive Blue 7 (Rb7) until uncolored species were obtained. Decolorization rate constants of the azo dye RB5 were higher than [...] Read more.
An electrochemical treatment (EC) was applied at different intensities to degrade the chromophoric groups of dyes C.I. Reactive Black 5 (RB5) and C.I. Reactive Blue 7 (Rb7) until uncolored species were obtained. Decolorization rate constants of the azo dye RB5 were higher than the phtalocyanine Rb7 ones. In addition, the EC treatment was more efficient at higher intensities, but these conditions significantly increased the generation of undesirable by-products such as chloroform. The combination of EC with UV irradiation (UVEC) drastically minimized the generation of chloroform. The photo-assisted electrochemical treatment was also able to achieve decolorization values of 99%. Finally, mixtures of dyes and surfactants were treated by EC and UVEC. In the presence of surfactants, the decolorization kinetic of dyes was slowed due to the competitive reactions of surfactants degradation. Both methods achieved total decolorization and in both cases, the generation of haloforms was negligible. Full article
(This article belongs to the Special Issue Functional Organic Dyes and Pigments)
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