Structure-property relationships in conjugated molecules

Conjugated dendrimers are ideal materials to study the structure-property r elationships in conjugated molecules. We have developed a family of dendrim ers that contain t-butyl surface groups, stilbene dendrons, and luminescent cores. For porphyrin and tris(distyrylbenzenyl) amine cored dendrimers cyc lic voltammetry (CV) showed that the redox processes occurred at the core. Combining the results from the CV experiments with the device characteristi cs it was determined that for the dendrimers the cores were held further aw ay from each other with increasing generation. For the amine cored dendrime rs it was found that the hole mobility decreased with generation, which is consistent with the cores being further apart. We also found for the amine cored dendrimers that the decrease in hole mobility was matched with increa se in device efficiency. (C) 2001 Elsevier Science B.V. All rights reserved .