... Interaction of Copper(II) and Titanium(IV) with Pyrogallol Red and Bromopyrogallol Red in the Presence of Surfactants . Abstract Complexation of titanium(IV) and copper(II) with pyrogallol red (PR) and bromopyrogallol red (BPR) in the presence cationic and nonionic surfactants were studied by spectrophotometric and colorimetric methods. ... Moscow University Chemistry Bulletin . 2003, Vol. ... Copyright (C) Chemistry Dept., ... Copyright (C) Chemisty Department of Moscow State University . ...