The Processes of Alkylphosphoryl-Substituted Phthalocyanine Disaggregation in Water in the Presence of Tetradecyltrimethylammonium Bromide

摘要

The solubility in dimethyl sulfoxide and disaggregation in water under the action of tetradecyltrimethylammonium bromide (C(14)TAB) have been studied for metal-free phthalocyanine modified with four alkylphosphoryl groups (I). Electronic absorption and luminescence spectroscopies have been employed to show that, in dimethyl sulfoxide, compound I exists not only in the associated state (as it was believed previously), but also as monomers, the amount which provides high-intensity radiation. In aqueous media at pH 7-9, aggregates of I prevail; however, they are disintegrated into individual molecules under the action of C(14)TAB. According to electronic absorption and luminescence spectroscopy data, compound I is stable with respect to aggregation in a C(14)TAB micellar solution with pH 7.4 not only at 298 K, but also upon rapid freezing to 77 K.