Alizarine violet

Qualitative Reactions.—Alizarin is insoluble in water, but soluble in boiling alcohol or in ether it dissolves in sodium hydroxide solution, giving a solution which is violet-blue for pure alizarin, violet for anthra-purpurin, purple-red for flavopuipurin, and red for purpurin. The sul-phonic derivatives are soluble in water and give violet alkaline solutions. 

Reagent Solution Disperse 124.5 mg of alizarin violet 3R in 500 mL of water contained in a 1-L volumetric flask. Mechanically stir overnight. Add 20 mg of sodium hexameta-phosphate, 48.5 g of ammonium chloride, and 6.2 mL of ammonium hydroxide (equivalent to 1.6 g of NH3). Dilute to volume with water, and stir overnight. A 10-fold aqueous dilution of this solution in a 1-cm cell has an absorbance of... 

Girofle, probably a homologue of a-dimethylsaffranine (Fuchsia), is obtained by acting onxylidine with nitrosodimethylaniline. It is used for shading alizarine violet and reds. 

Four anthraquinonic dyes, Alizarin red S, Alizarin violet R, Acid green 25, and Acid blue 129 are presented. The simplest one, the Alizarin red S, is derived from alizarine by the introduction of a sulphonate group in the alizarine structure in position 3 (Fig. 7). 

Figure 11. UV-visible spectra of acid green 25 (left) and Alizarin violet R (right) dyes in acid and basic media (water, pathlength 2 mm for acid green 25, 10 mm for Alizarin violet R).

The typical double-headed peak of 1,4 disubstituted derivatives is present on acid blue 125 visible range of UV spectra (X = 588 nm and X = 628 nm). In strong acid medium (pH = 1.0), protonation can occur on the nitrogen atom it seems to be more easy with Acid blue 129 dye than with Acid green 25 and Alizarin violet R dyes, where the steric hindrance around nitrogen atoms is more important. 

Disodium salt, CnH.mNa.O, alizarin violet. pH 10.6 rose pH 13.0 violet. 

Key CL, chemiluminescence UV, ultraviolet IDS, indigo-5,5 -disulfonate ITS, indigo-5,5, 7-trisulfonate ACVK, Acid Chrome Violet K (Alizarin Violet 3R) n.a., For batch methods, sampling time (s) is shown in parentheses. 

As in the case of indigosulfonates. Alizarin Violet 3R (Acid Chrome Violet K) loses its color on reaction with ozone and chlorine dioxide. Ozone can be determined from the decrease in absorbance at 548 nm after mixing with a sample solution. This method is less sensitive than the indigo methods. Chlorine, hypochlorite, chlorite, and chlorate do not interfere. While chlorate(in) can also be determined by this method, it does not coexist with ozone in treated waters. 

Other Names C.I. Mordant Violet 5 C.I. Mordant Violet 5, monosodium salt Eriochrome Violet B Acid Alizarin Violet N Acid Alizarine Violet Acid Alizarine Violet B Acid Chrome Violet K Acid Chrome Violet N Aizen Chrome Violet BH Alizarine Violet N Alphacroic Violet B Atlantichrome Violet B Brasilan Chrome Violet B C.I. 15670 Chromacid Violet R Chromaven Violet B Chrome Fast Violet B Chrome Violet B Chrome Violet K Chrome Violet R Cromal Violet B Diacromo Violet N Diamond Corinth N Durochrome Violet B Erio Chrome Violet BA Erio Chrome Violet BR Hispacrom Violet B Java Chrome Violet B Magracrom Violet N Mitsui Chrome Violet BC Monochrome Violet B Mordant Violet 5 Omega Chrome Dark Violet D Pontachrome Violet S W Solochrome Violet Solochrome Violet R Solochrome Violet RS Solo-crom Violet RS Sunchromine Violet B Superchrome Violet B Symulon Chrome Violet B Tertro-chrome Violet N Yodochrome Violet B... 

Grosman, J. Vardaxis, N. J. Aluminum acid alizarin violet a general purpose nuclear fluorochrome. Biotechnic Histochem. 1997, 72, 299-303. 

Other Names Gallein Alizarine violet C.l. 45445 C.l. Mordant Violet 25 Mordant Violet 25 ... 

Qi, Z. Yao, J. Chen, H. The cocoloration system of alkahne earth(II)-rare earths(III)-alizarine violet-tetradecylpyridinium chloride. Beijing Keji Daxue Xuebao 1989, 11, 486-491 Chem. Abstr. 1991, 114, 73971. 

Das, S. Pal, P Pal, A. J. A comparison between CW and pulsed mode operations of light-emitting devices based on alizarin violet. J. Mater. Sci. 2001,12, 37-40. 

Baijnath, Y Vasam, C. Jonnalagadda, S. B. A Photometric Method for ozone determination using alizarin violet. J. Environ. Sci. Health, Part A 2004, A39, 2485-2492. 

Li, Y Xie, H. Zhou, F. Alizarin violet modified carbon paste electrode for the determination of trace silver (I) by adsorptive voltammetry. Talanta 2005, 67, 28-33. 

Light-emitting devices based on sequentially adsorbed layer-by-layer SELF-ASSEMBLED FILMS OF ALIZARIN VIOLET... 

The dye used in this work was alizarin violet. PAH (MW = 70 000) and the dye was purchased from Aldrich Chemical Co. and PAA (MW = 90 000) was obtained from Polyscience as 25 % aqueous solution. All the chemicals were used without further purification. The chemical structure of alizarin violet is shown in Fig. 1. The polyelectrolyte deposition baths were prepared with 10 M (based on repeat units) aqueous solutions using 18.2 MQ Millipore water. The solutions of alizarin violet and PAH were mixed in a controlled way so that SOj ions of alizarin violet get attached to NH ions of PAH. The low concentration of alizarin in PAH allowed 80 % of the NH ions of PAH to take part in the adsorption process during layer-by-layer deposition. Use of organic molecule alone as anion generally results in material loss during washing [9, 10]. 

Fig. 2 Device current-field characteristics of LEDs based on layer-by-layer self-assembled films of alizarin violet/PAH and PAA, deposited at three different pHs of the polyanion (PAA).

We have studied luminance versus current density plots in devices based on SA films deposited at different polyanion pHs. Luminance has been detected only under forward bias directions. Luminance versus current density plots for devices based on different SA films are presented in Fig. 5. Similar plot for devices with spin-cast film of alizarin violet has also been shown in the figure for comparison. Each of the plots shows a sharp tum-on followed by a linear behaviour in the log-log scale. The turn-on current is generally determined by the amount of electron injection required for light emission in these devices. The turn-on current and the luminance from the LEDs at any current density depended on the polyanion pH used in SA film deposition. The figure shows that the LEDs based on SA films (deposited at a suitable polyanion pH) can yield higher luminance than the devices based on spin cast films. The tum-on currents in such devices are also lower as compared to the spin-cast counterpart. 

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