AGGREGATION OF METHYLENE-BLUE ADSORBED ON STARBURST DENDRIMERS

The adsorption and aggregation of methylene blue (MB) on anionic starb urst dendrimers (n.5 SBD) was studied by UV-vis and fluorescence spect roscopy. The aggregation of MB depends strongly on the generation of S BD. For SBDs of later generation the aggregation occurs more readily a nd the number of MB molecules involved in one aggregate is larger than for earlier generations. It is proposed that the MB molecules stack p erpendicular to the surface of the SBDs and not as a pile parallel to the surface. UV-vis and fluorescence experiments give identical result s.