Two-dimensional supramolecular assemblies of a polydiacetylene. 1. Synthesis, structure, and third-order nonlinear optical properties

K. E. Huggins, S. Son, Samuel I Stupp

Research output: Contribution to journalArticle

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Abstract

A diacetylene monomer with a rigid backbone and capable of forming hydrogen bonds was synthesized and found to polymerize forming two-dimensional supramolecular assemblies. The two-dimensional structure self-assembles when UV light generates polydiacetylene comb polymers, and hydrogen bonds are established within molecular layers. The two-dimensional assemblies have been characterized by X-ray diffraction and infrared spectroscopy and found to consist of highly ordered bilayers. The material forms blue solid thin films which generate third-order nonlinear optical signals and have remarkable photochemical stability to 1064 nm radiation from a Q-switched Nd:YAG laser. Upon heating to 62 °C, the material turns bright red reversibly while maintaining its two-dimensional structure, and this thermochromic process is accompanied by endothermic and exothermic signatures detected by differential scanning calorimetry. Most importantly, however, variable temperature sum frequency generation experiments show that the third-harmonic generation signals retain much of their original intensity through the thermochromic transitions. These results do not conform in a consistent manner to both the theory of third-order effects and the previously suggested connection between intramolecular conjugation and optical absorption of polydiacetylenes. It is therefore possible that intermolecular interactions in these highly ordered structures play a role in defining optical properties.

Original languageEnglish
Pages (from-to)5305-5312
Number of pages8
JournalMacromolecules
Volume30
Issue number18
Publication statusPublished - Sep 8 1997

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Optical properties
Hydrogen bonds
Harmonic generation
Ultraviolet radiation
Light absorption
Differential scanning calorimetry
Infrared spectroscopy
Polymers
Monomers
Radiation
Heating
X ray diffraction
Thin films
polydiacetylene
Lasers
Experiments
Temperature

ASJC Scopus subject areas

  • Materials Chemistry

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Two-dimensional supramolecular assemblies of a polydiacetylene. 1. Synthesis, structure, and third-order nonlinear optical properties. / Huggins, K. E.; Son, S.; Stupp, Samuel I.

In: Macromolecules, Vol. 30, No. 18, 08.09.1997, p. 5305-5312.

Research output: Contribution to journalArticle

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