Reference

Electrochemical oxidation of diphenylamine on a platinum anode

Electrochemical oxidation of diphenylamine on a platinum anode. Timofeeva, Z. N.; Kudryavtseva, T. K. (Leningr. Tekhnol. Inst., Leningrad, USSR). Elektrokhimiya, 13(9), 1387-90 (Russian) 1977. CODEN: ELKKAX. DOCUMENT TYPE: Journal CA Section: 72 (Electrochemistry) Section cross-reference(s): 22, 25 The anodic oxidn. of diphenylamine (I) [122-39-4] in MeCN was studied using a rotating Pt disk electrode. The diffusion limiting c.d. is a linear function of the sq. root of the rpm. Assuming a 2 electron transfer, the diffusion coeff. of I is estd. to be 1.78.10-5 cm2/s. The kinetic parameters of the reaction are exptl. evaluated presuming a 1st order reaction with respect to I: k = 3.2 ′ 10-2 exp [0.54 F(f-f1/2)/RT]. The products of the oxidn., which were spectrophotometrically characterized, are N,N'-diphenylbenzidine [531-91-9] with a violet color and its cation radical with a yellow-green color. When the soln. is alkalized with NH3, triethylamine, or pyridine the oxidn. products changed to tetraphenylhydrazine [632-52-0], and the anode is passivated. The oxidn. of OH- in MeCN on Pt proceeds at lower anodic potentials than in the case of aq. solns. and stable passive adsorption coatings are formed on the anode.

Analytical applications of bromamine-T

Analytical applications of bromamine-T. Gowda, H. Sanke; Gurumurthy, S. (Dep. Post-Grad. Stud. Res. Chem., Univ. Mysore, Mysore 570 006, India). J. Indian Chem. Soc., 61(2), 179-80 (English) 1984. CODEN: JICSAH. ISSN: 0019-4522. DOCUMENT TYPE: Journal CA Section: 64 (Pharmaceutical Analysis) Ascorbic acid [50-81-7], As(III), hydroquinone [123-31-9], hydrazine [302-01-2], INH [54-85-3], semicarbazide [57-56-7], phenylhydrazine [100-63-0], and hexacyanoferrate (II) [13408-63-4] were detd. by direct titrn. with bromamine T [41085-71-6] by using naphthidine [481-91-4], 3,3'-dimethylnaphthidinedisulfonic acid [55802-03-4], o-dianisidine [119-90-4], diphenylbenzidine [531-91-9], Quinoline Yellow [8004-92-0], Variamine Blue [3566-44-7], a-naphthoflavone [604-59-1], Amaranth (dye) [915-67-3], methyl red [493-52-7] and methyl orange [547-58-0] as redox indicators. Both potentiometric and visual titrimetry procedures were used. The visual titrn. gave deviations from the permissible range of acidities and the indicators and KBr lead to sluggish, premature or late end-points.