Chromatic properties of polydiacetylene films

The thermochromic and proposed visible photochromic properties of PDA-12,8 are examined by resonance Raman (RR) and Fourier transform infrared (FTIR) spectroscopies. The chromatic properties are derived from the conversion of a blue-colored PDA-12,8 material (produced upon ultraviolet-induced polyme...

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Bibliographic Details
Published in:Journal of the American Chemical Society 1989-08, Vol.111 (16), p.6123-6127
Main Authors: Wenzel, M, Atkinson, George H
Format: Article
Language:English
Subjects:
360603 - Materials- Properties
400400 - Electrochemistry
990200 - Mathematics & Computers
Applied sciences
CHEMISTRY
DATA
DATA ANALYSIS
Exact sciences and technology
EXPERIMENTAL DATA
GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE
HYDROCARBONS
INFORMATION
INFRARED SPECTRA
INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY
MATERIALS SCIENCE
MEASURING INSTRUMENTS
MEASURING METHODS
NUMERICAL DATA
ORGANIC COMPOUNDS
PHOTOCHEMISTRY
Physicochemistry of polymers
POLYACETYLENES
POLYENES
Polymers and radiations
Properties and characterization
RAMAN SPECTRA
SPECTRA
THERMAL ANALYSIS
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Description
Summary:The thermochromic and proposed visible photochromic properties of PDA-12,8 are examined by resonance Raman (RR) and Fourier transform infrared (FTIR) spectroscopies. The chromatic properties are derived from the conversion of a blue-colored PDA-12,8 material (produced upon ultraviolet-induced polymerization) to a red-colored material. Experiments are performed under well-controlled thermal conditions which aid in separating the ultraviolet polymerization used to generate the blue-colored polymeric material from its well-known thermochromic process and from photochromism proposed to be induced by visible radiation. For example, irradiation at 532 nm of water-cooled (0.5{degree}C) samples of the blue-colored material produces no chromatic changes. A chromatic change to the red-colored material is induced by 532-nm radiation, however, when the PDA-12,8 is not cooled. No evidence supported a visible photochromic change in PDA-12,8 is found, and it is proposed that the previously reported chromatic properties derive from thermal effects. RR and FTIR data are presented which demonstrate that separate structural changes in the polydiacetylene backbone and in the hydrocarbon side chains of DPA-12,8 accompany the chromatic changes. RR results also show that no change occurs in the distribution of electron density along the PDA-12,8 backbone when chromatic effects are induced.
ISSN:0002-7863
1520-5126
DOI:10.1021/ja00198a020