Triarylmethane dye: Difference between revisions
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===Methyl violet dyes=== |
===Methyl violet dyes=== |
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Image:Methyl Violet 2B.png|Methyl violet 2B |
Image:Methyl Violet 2B.png|[[Methyl violet]] 2B |
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Image:Methyl Violet 6B.png|Methyl violet 6B |
Image:Methyl Violet 6B.png|[[Methyl violet]] 6B |
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Image:Methyl Violet 10B.png|Methyl violet 10B |
Image:Methyl Violet 10B.png|[[Crystal violet|Methyl violet 10B]] |
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===Malachite green dyes=== |
===Malachite green dyes=== |
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Image:Malachite green structure.svg |Malachite green |
Image:Malachite green structure.svg |[[Malachite green]] |
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Image:brilliantgruen.png|Brilliant green |
Image:brilliantgruen.png|[[Brilliant green (dye)]] |
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Revision as of 13:34, 14 June 2011
Triarylmethane dyes are synthetic organic compounds containing triphenylmethane backbones. As dyes, these compounds are intensely colored. Many of these dyes undergo reactions in response to acid and base, and thus serve as pH indicators.[1]
As a consequence of their structure, the Friedel-Crafts alkylation reaction is a popular method to prepare many of these compounds:
Families
Some triarylmethane dyes can be grouped into families of dyes with very similar structures. In some cases, the anions associated with the cationic dyes (say crystal violet) vary even though the name of the dye does not.
Methyl violet dyes
Fuchsine dyes
Fuchsine dyes have amine functional groups at the p-positions of each phenyl group.
-
-
Fuchsine (hydrochloride salt) -
New fuchsine (cation) -
Phenol dyes
Phenol dyes have hydroxyl groups at the p positions of each phenyl group.
Malachite green dyes
Bridged arenes
Where two of the aryl groups are bridged by a heteroatom, these triarylmethane compounds may be further categorized into acridines (nitrogen-bridged), xanthenes (oxygen-bridged), and thioxanthenes (sulfur-bridged).
References
- ^ Gessner, Thomas; Mayer, Udo (2000). "Triarylmethane and Diarylmethane Dyes". Ullmann's Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH. doi:10.1002/14356007.a27_179. ISBN 978-3527306732.