Spectrophotometric studies: Spectra were
recorded at room temperature on a Philips PU
8720 UV/VIS scanning spectrophotometer using a
5 mm glass cell in the 400±600 nm range. Beer's
law experiments were performed using 2 ml of
stock solution (6.510ÿ4 M Procion Red MX-5B;
3.7510ÿ4 M Remazol Red F-3B), serially dilu-
ted with equal volumes of water