894-86-0

Basic information

• Product Name: Vat Blue 1, Reduced
• Synonyms: Vat Blue 1, Reduced;disodium [2,2'-bi-1H-indole]-3,3'-diolate;Reduced Vat Blue 1;[2,2'-bi-1H-Indole]-3,3'-diol, disodium salt;3,3'-Bis(sodiooxy)-2,2'-bi(1H-indole);3,3'-Bis(sodiooxy)-2,2'-bi[1H-indole];C.I.Reduced Vat Blue 1;disodium 2-(3-oxidanidyl-1H-indol-2-yl)-1H-indol-3-olate
• CAS NO: 894-86-0
• Molecular Formula: C16H10N2Na2O2
• Molecular Weight: 308.24234
• EINECS: 212-974-6
• Mol File: 894-86-0.mol
• Article Data: 4

Chemical Properties

• Boiling Point: 591.3°C at 760 mmHg
• Flash Point: 311.4°C
• Appearance: /
• Density: 1.35[at 20℃]
• Vapor Pressure: 1.41E-14mmHg at 25°C
• Water Solubility: 50μg/L at 23℃
• CAS DataBase Reference: Vat Blue 1, Reduced(CAS DataBase Reference)
• NIST Chemistry Reference: Vat Blue 1, Reduced(894-86-0)
• EPA Substance Registry System: Vat Blue 1, Reduced(894-86-0)

Safety Data

• Hazardous Substances Data: 894-86-0(Hazardous Substances Data)

Usage

Preparation

commonly known as Indigo White.?3H-indol-3-one,2-(1,3-dihydro-3-oxo-2H-indol-2-ylidene)-1,2-dihydro- in the presence of a base reduction (with or without various stabilizers may be).

Properties and Applications

purplish blue to red light navy blue. Soluble in Etanol for blue, fluorescence. In the Sodium hydroxide solution for yellow green, In the basic insurance powder solution for yellow; In the acidic insurance powder solution for colorless. Mainly used for cotton fabric dyeing, also can be used for viscose and adhesive/cotton blended fabric dyeing. Standard Ironing Fastness Chlorine bleach Light Fastness Mercerized Oxygen bleach Soaping Fading Stain ISO 4 2 3 4 2-3 AATCC 3 1-2 3 2-3

Standard

Ironing Fastness

Fading

Stain

ISO

4

AATCC

3

InChI:InChI=1/C16H12N2O2.2Na/c19-15-9-5-1-3-7-11(9)17-13(15)14-16(20)10-6-2-4-8-12(10)18-14;;/h1-8,17-20H;;/q;2*+1/p-2

Upstream product

• 6537-68-4 leucoindigo 
• 64784-13-0 indigo 
• 482-89-3 1H,1H'-2,2'-Biindolylidene-3,3'-dione 

Downstream Products

• 95201-46-0 N,N'-bis(2-phenylbutyryl)-2,2'-bi-indolinylidene-3,3'-dione 
• 95201-46-0 N,N'-bis(2-phenylbutyryl)-2,2'-bi-indolinylidene-3,3'-dione 
• 95201-52-8 N,N'-bis(p-mehoxyphenylacetyl)-2,2'-bi-indolinylidene-3,3'-dione 
• 95201-44-8 N,N'-bis(p-mehoxyphenylacetyl)-2,2'-bi-indolinylidene-3,3'-dione 
• 84312-15-2 N,N'-bis(phenylacetyl)-2,2'-bi-indolinylidene-3,3'-dione 
• 84312-19-6 N,N'-bis(phenylacetyl)-2,2'-bi-indolinylidene-3,3'-dione 

Relevant articles and documents

Characterization of the excited states of indigo derivatives in their reduced forms

A comprehensive characterization of the electronic spectral and photophysical properties of the leuco (reduced) form of several indigo derivatives, including indigo and Tyrian Purple, with di-, tetra-, and hexa-substitution, was obtained in solution. The characterization involves absorption, fluorescence, and triplet-triplet absorption spectra, together with quantitative measurements of quantum yields of fluorescence, ΦF(0.46- 0.04), intersystem crossing, ΦT (0.013-0.034), internal conversion, ΦIC, and the corresponding lifetimes. The position and degree of substitution promote differences in the spectral and photophysical properties displayed by the investigated leuco derivatives. The ΦF values are about two orders of magnitude higher than those previously obtained for the corresponding keto forms. Also in contrast with the behavior found for the keto forms, the S1~~→T1 intersystem crossing is an efficient route for the excited-state deactivation channel. These findings strengthen the fact that, in contrast to keto indigo where the internal conversion dominates the deactivation of the excitedstate, with leuco indigo (and derivatives), the excited state deactivation involves competition between internal conversion, triplet state formation, and fluorescence. A time-resolved investigation of one of the compounds in glycerol showed the presence of a photoisomerization process.

Direct electrochemical reduction of indigo

Increasing ecoefficiency of textile wet processes has become an important topic in our research group. Reducing agents required for the application of vat and sulfur dyes cannot be recycled, and they lead to problematic waste products. Therefore, modern aspects of economical and ecological requirements are not fulfilled. The application of direct electrochemical reduction of indigo as a novel route has been investigated by spectrophotometric and voltammetric experiments in laboratory cells. Experiments yield information about the reaction mechanism and the kinetics, and they show the possibility of this new route for production of water-soluble indigo, which offers tremendous environmental benefits.