Polymer-Controlled Synthesis of 1-(2-Pyridylazo)-2-Naphthol Hierarchical Architectures

Abstract

The self-assembly of org. 1-(2-Pyridylazo)-2-naphthol (PAN) into hierarchical architectures, such as microfibers, microrods, and sheaflike structures, in soln. was successfully achieved by repptn. method with the assistance of thermoresponsive diblock copolymer poly(N,N-dimethylacrylamide)-b-poly(N-isopropylacrylamide) (PDMA-b-PNIPAM). The morphol. modification can be readily controlled by varying the polymer concns. The optical absorption and fluorescence emission properties of the as-prepd. PAN architectures were studied. Time-dependent spectra of the pptg. soln. for sheaflike structures formation were measured to monitor the self-assembly process of PAN mols. The PAN microstructures exhibited intense fluorescence emission, indicating an unusual aggregation-induced emission enhancement (AIEE) phenomenon for PAN, which has great potential for future use in optoelectronic microdevices. [on SciFinder(R)]