Picramine

Apart from PAR, many other azo reagents have been applied as spectrophotometric reagents for indium. l-(2-Pyridylazo)-2-naphthol (PAN) has been applied widely as analytical reagent for indium [24,36-38]. The indium chelate with PAN is extractable into chloroform from solutions of pH 6 (e = 1.9-10 ). Indium has also been determined with PAN by derivative spectrophotometry [39]. Other azo reagents proposed for indium include 2-(2-pyridylazo)-l-hydroxynaphthalene-4-sulphonic acid [40], TAR (formula 4.7) [41], Lumogallion (e = 5.4-10 at 510 nm) (formula 21.1) [42], Sulpharsazen [43], Thoron I [44], and Eriochrome Black T (extraction into n-butanol in the presence of diphenylguanidine, = 3.6-10 ) [45], Picramine M [46], 2-(2-thiazolylazo)-p-cresol (TAC) [47], and 2,4,6-tris(2-hydroxy-4-sulphonaphthylazo)l,3,5-triazine (e = 8.4-10 [48]. 

Tantalum has been determined in the presence of Nb by derivative spectrophotometry with the use of Picramine-epsilon [117]. 

The ion-associate (the anionic Zr-Picramine-epsilon complex and the basic dye Ethyl Rhodamine B) is floated, and dissolved in acetone (e = 3.2-10 ) [80]. 

Hydroxy-3,5-dinitroaniline Picramic acid Picraminic acid... 

Picramide. See 2,4,6-Trinitroaniline Picraminic acid. See 2-Amino-4,6-dinitrophenol Picrasa-1,12-diene-1,11,16-trione, 2,12-dimethoxy-. SeeQuassin Picrasma excelsa. See Quassia Picric acid... 

Needle- or leaf-shaped crystalline DDNP is obtained when pure reactants are used at common reaction conditions (Fig. 6.2). The addition of acid to the reaction mixture is the more common way of DDNP preparation [13, 27-29] although addition of nitrite into acidic solution of picraminate acid is also published [7, 24]. 

A number of polynitro derivatives can be reduced under the influence of monosaccharides. For example, picric acid is reduced to picraminic acid (56, 57). 

Hydroxy-3,5-dinitroaniline. Picramic acid. Picraminic acid [96-91-3]... 

Picramine K, P-00232 3-[(3-Chloro-2-hydroxy-5-nitrophenyl)azo]-6-[(5-chloro-2-hydroxy-3-sulfophenyl)azo]-4,5-dihydroxy-2,7-naphthalenedisulfonic acid, C-00138... 

Phthalocyaninetetrasulfonic acid Tetra-Na salt, in P-00231 Picramine K, P-00232 Picramine M, P-00233 Picriminazosulfoxine, P-00234 >Picrolonic acid, P-00235... 

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