Ion-association between some ditetrazolium cations and anions originated from 4-(2-thiazolylazo)resorcinol or 4-(2-pyridylazo)resorcinol

Abstract

Ion-associates between cations originating from ditetrazolium salts (DT: Neotetrazolium chloride (NT), Blue Tetrazolium chloride (BT), Nitro Blue Tetrazolium chloride (NBT), and Tetranitro Blue Tetrazolium chloride (TNBT)) and anions originating from azo compounds (AC: 4-(2-pyridylazo)resorcinol (H2PAR) and 4-(2-thiazolylazo)resorcinol (H2TAR)) were studied by water-chloroform extraction and spectrophotometry. Some key characteristics of the extracted compounds were determined. They can be expressed by different formulae depending on the ACs and DTs used: (1) (DT + )(HPAR - ) (for DT = BT, NBT or TNBT); (2) (DT 2+ )(HTAR - )2 (for DT = BT, NBT or TNBT); and (3) (DT + )2(HAC - )2 (for DT = NT).