UNIVERSIDAD DE ALICANTE

New family of dyes

Posted by UNIVERSIDAD DE ALICANTEResponsive · Innovative Products and Technologies · Spain

Summary of the technology

The main innovative aspects of this technology regarding current methods of synthesis are:
• The indolizine dyes are obtained in one step from commercially available materials, unlike current procedures, which involve multiple steps. This is an advantage in the production process, as it reduces costs, increases the final yield and less waste is generated.
• The procedure is based on a very simple treatment which produces indolizine dyes in yields higher than 70%.
• The present invention does not require the use of inert atmosphere, dry solvents or physical activation (heat or radiation) to obtain the final product.
• Unlike other methodologies for preparing indolizine dyes (requiring temperatures around 100°C), this process is carried out at room temperature and atmospheric pressure, which simplifies the method and decreases production costs.
• This is an environmentally friendly technology because it does not use solvents such as dioxane, pyridine, chloroform or benzene, which are used in other methods and are characterized by their high toxicity and demonstrated carcinogenicity.
• The selectivity of the reaction is very high. The indolizine dye is obtained with absolute control, obtaining a single isomer of the ten possible.

Description of the technology

The Institute of Organic Synthesis at the University of Alicante has developed an innovative method for synthesizing a new family of indolizines with dye properties. A prominent feature of this method is that the molecules of interest are obtained in one step from commercially available materials under mild reaction conditions (room temperature and atmospheric pressure). The compounds obtained are solvatochromic, that is, their colors vary according to the solvent used. The technology is environmentally friendly and the method is rapid and selective with yields higher than 70%. These novel compounds can be customized for any industry application with potential interest. The group is looking for companies interested in acquiring this technology for commercial exploitation through licensing agreements of the patent, manufacturing agreements or research agreements to develop new applications.

Specifications

In order to overcome limitations described above, it has been explored synthesis of novel indolizine dyes and succeeded in developing a novel efficient synthetic route. This invention relates to a new family of indolizines with dye properties and its production involves the use of a single starting material. This is an indolizine which is transformed into another more substituted indolizine with dye properties, under mild reaction conditions (room temperature and atmospheric pressure) The main innovation of this method of synthesis is that the new substituent that binds to the indolizine nucleus is derived from another molecule of the starting indolizine (A + A → T), and it is selectively incorporated into a specific position in the molecule. Therefore, the present invention relates to a new indolizine with solvatochromic properties and a novel, selective and effective synthetic procedure of these dyes from simpler indolizines. Alternatively, the indolizine dyes can be obtained through multicomponent synthesis (from commercially available materials) of the precursor indolizine of the dye in a single reaction vessel. In this case, the isolation and purification of the dye precursor indolizine is unnecessary, showing a similar yield but with a decrease in the cost and time of production. The synthetic process is very simple (it is produced in a single reaction vessel) and the dyes obtained are orange-red solids (Figure 1). In addition, this new class of compounds has the interesting and advantageous property of being solvatochromic, that is, its color depends on the solvent used, with the potential applications that can appear. This feature is due to the chromophore group which is selectively inserted at the 7-position of the starting indolizine (which comes from another indolizine homologous), providing a high conjugation and, therefore, solvatochromic dye properties. Thus, a different dye color can be obtained according to the solvent used for dissolving the solid indolizine (hexane, dichloromethane, chloroform, 1,4-dioxane, ethanol, acetonitrile and N,N-dimethylformamide) (Figure 2).

Main advantages of its use

  • The selectivity of the reaction is very high. The indolizine dye is obtained with absolute control, obtaining a single isomer of the ten possible.
  • It does not require the use of inert atmosphere, dry solvents or physical activation (heat or radiation) to obtain the final product.
  • It is an environmentally friendly technology. It does not use solvents such as dioxane, pyridine, chloroform or benzene.
  • It produces indolizine dyes in yields higher than 70%.
  • It reduces costs, increases the final yield and less waste is generated.
  • This process is carried out at room temperature and atmospheric pressure, which simplifies the method and decreases production costs.

Applications

  • Alternative energy (solar energy and photovoltaic solar).
  • Chemicals and materials (plastic industry, homogeneous injections/extrusions, non-homogeneous injections/extrusions, polymer (plastics) materials).
  • Cosmetics.
  • Electrochromic devices.
  • Electronic chemicals.
  • Leather tanning.
  • Optical filters.
  • Paints.
  • Photoelectric converters (solar cells)
  • Photothermography.
  • Recording devices and laser scanning.
  • Scanning related.
  • Staining and dyeing materials.
  • Textile (synthetic and natural).
  • Thermography.

Additional information (attached documents)

Additional information (attached documents)

Related keywords

  • Moulding, injection moulding, sintering
  • Surface treatment (painting, galvano, polishing, CVD, PVD)
  • Colours and varnish
  • Fine Chemicals, Dyes and Inks
  • Optical Materials
  • Plastics, Polymers
  • Advanced Textile Materials
  • Colours, dyes related to Chemical Technology and engineering
  • Organic Substances
  • Dyes related to Footwear / Leather Technology
  • Phtovoltaics Technology
  • Solar / Thermal Energy Technology
  • Organic Chemistry
  • Recording Devices
  • Polymer (plastics) materials
  • Chemicals and Materials
  • Electronic chemicals
  • Solar / Thermal Energy Market
  • Photovoltaics Market
  • Indolizines
  • dye
  • solvatochromic
  • paint
  • electrochromic
  • leather tanning
  • optical filter
  • photoelectric
  • photothermography
  • recording devices
  • thermography.

About UNIVERSIDAD DE ALICANTE

Research & Technology Organization from Spain

As one of the largest universities of Spain, Universidad de Alicante has a rich history of innovation. Our main objective is goal is to to transfer the technology that our research teams are developing to the industries and companies which are able to take profit from them. R & D & Innovation results and know-how are offered in the domains of Chemistry, Materials, Environment, IT, Building and other applied subjects.

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