Publication Details (including relevant citation information):
Macromolecules, 2008, 41 (9), pp 3169–3174
Two Poly(2,5-thienythiazolothiazole)s: Observation of Spontaneous Ordering in Thin Films
Authors: Naraso (Borjigin), and Fred Wudl
Figure 6. UV−vis absorption and PL emission spectra of polymers in chloroform.
Figure 11. Crystal structure of compound 4a: (a) top view and side view of the molecule; (b) molecular packing.
Figure 12. X-ray diffraction of drop-cast thin films of monomers 4a, 5a and polymers 4b, 5b.
The synthesis and properties of two new polymers based on thiazolothiazole are described. The polymers dissolve in common organic solvents such as chloroform and chlorobenzene. Their molecular weights are in the kDa range with polydispersities on the order of 1.1−1.3 as determined by GPC. The X-ray crystal structure of one monomer was determined. Interplanar π−π interaction and short S···N contacts (3.20 Å) were observed in the crystal. The monomers and polymers strongly fluoresce in solution. Their quantum yields range from 23 to 55% relative to 9,10-diphenylanthracene and rhodamine B. Contrary to expected polymer behavior, the polymers are unusual in that they self-assemble upon drop-casting. The thin films of polymers exhibited sharp reflection peaks in the low-angle region in XRD measurement, indicating a highly ordered assembly.
Address (URL): http://pubs.acs.org/doi/abs/10.1021/ma071857k