Number of the records: 1
J-like liquid-crystalline and crystalline states of polyaniline revealed by thin, highly crystalline, and strongly oriented films
- 1.0431082 - ÚMCH 2015 RIV US eng J - Journal Article
Gospodinova, Natalia - Tomšík, Elena - Omelchenko, Olga
J-like liquid-crystalline and crystalline states of polyaniline revealed by thin, highly crystalline, and strongly oriented films.
Journal of Physical Chemistry B. Roč. 118, č. 29 (2014), s. 8901-8904. ISSN 1520-6106. E-ISSN 1520-5207
R&D Projects: GA ČR(CZ) GA13-00270S
Institutional support: RVO:61389013
Keywords : J-aggregates * organic semiconductors * polyaniline
Subject RIV: CD - Macromolecular Chemistry
Impact factor: 3.302, year: 2014
Liquid-crystalline state of dyes can be easy distinguished from the crystalline one by the appearance of characteristic long-wavelength optical absorption, the so-called J-band. Similarly, long-wavelength absorption of polyaniline is assumed to be the signature of its J-like liquid-crystalline state. When water evaporates from polyaniline adsorbed on a glass support during polymerization, the long-wavelength maximum at about 800 nm disappears, and one at 570 nm appears, characteristic for highly crystalline and strongly oriented thin film. Reversible red shift of long-wavelength absorption upon water adsorption is a significant feature of these films. By analogy with dyes, it is attributed to water-promoted superficial formation of J-like mesophase. Such surprising properties of wet films as propagation of chemical reduction and enhanced exciton transport, reported by us recently, can also be considered as a signature of the J-like liquid-crystalline state of polyaniline.
Permanent Link: http://hdl.handle.net/11104/0235725
Number of the records: 1