CHARGE-TRANSFER COMPLEXATION IN AQUEOUS POLYELECTROLYTE SOLUTION .1. COMPLEXATION BETWEEN DIMETHOXYANTHRACENESULFONATE ION AND ANTHRAQUINONESULFONATE ION

Absorption and fluorescence spectroscopic studies on the charge-transf er (CT) complexation between 9,10-dimethoxyanthracene-2-sulfonate ion (DMACS-) and 9,10-anthraquinone-2-sulfonate ion (AQS-) in aqueous solu tion were performed in the presence of poly(allylammonium chloride) (P AAH+Cl-), as well as in its absence. No spectroscopic indication of th e CT complex was recognized by mixing Na+DMACS- (1 X 10(-4) M) with Na +AQS- (1 X 10(-4) M), but the addition of PAAH+Cl- to the mixed soluti on brought about the CT complexation. On the other hand, in the absenc e of PAAH+Cl-, DMACS- and AQS- also form the CT complex when their con centrations become ca. 1 x 10(-3) M. Therefore, the CT complexation be tween DMACS- and AQS- in PAAH+Cl- solution can be attributed to a clos e proximity of DMACS--AQS- pairs, which results from the electrostatic binding of them by the polyions. The continuous variation method for the CT band indicated that a 1:2 (DMACS-:AQS-) complex and a 1:1 compl ex were preferentially formed in the presence and absence of PAAH+Cl-, respectively. The above results show that the high electrostatic pote ntial of PAAH+ affects the complexation, especially the stoichiometry.