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Diacetylene mixed Langmuir monolayers for interfacial polymerization.

Luisa Ariza-Carmona1, Carlos Rubia-Payá1, G García-Espejo1

  • 1Institute of Fine Chemistry and Nanochemistry, Department of Physical Chemistry and Applied Thermodynamics, University of Córdoba, Campus Universitario de Rabanales, Edificio Marie Curie, Córdoba, Spain E-14014.

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|April 22, 2015
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Summary

Polydiacetylene (PDA) supramolecular structure was investigated using 10,12-pentacosadiynoic acid and OTCC in a mixed Langmuir monolayer. Unexpectedly, photopolymerization yielded the red PDA form, challenging previous assumptions about DA unit orientation.

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Area of Science:

  • Materials Science
  • Supramolecular Chemistry
  • Polymer Chemistry

Background:

  • Polydiacetylenes (PDA) are versatile materials synthesized via diacetylene (DA) monomer polymerization, typically yielding a blue form.
  • DA polymerization is a topochemically controlled 1-4 addition reaction crucial for PDA properties.
  • Understanding PDA's blue and red forms is key for applications in electronics and biosensing.

Purpose of the Study:

  • To investigate the supramolecular structure of a mixed Langmuir monolayer composed of 10,12-pentacosadiynoic acid (DA) and N,N -dioctadecylthiapentacarbocyanine (OTCC).
  • To elucidate the mechanism of photopolymerization in this mixed system and understand the formation of different PDA polymorphs.
  • To propose a model correlating molecular orientation with the resulting blue or red PDA forms.

Main Methods:

  • Formation and characterization of a mixed Langmuir monolayer using DA and OTCC.
  • Surface pressure measurements to analyze monolayer stability and packing.
  • Brewster angle microscopy and UV-vis reflection spectroscopy for structural and optical analysis.
  • Computer simulations to model molecular arrangements and polymerization outcomes.

Main Results:

  • The DA:OTCC mixed monolayer exhibited a sequential arrangement of molecules, with OTCC alkyl chains spacing DA units.
  • Contrary to expectations, photopolymerization occurred without phase segregation, exclusively forming the red PDA polymorph.
  • A model was proposed linking the relative orientation of DA units to the formation of blue or red PDA.

Conclusions:

  • The DA:OTCC mixed Langmuir monolayer self-assembles into a unique supramolecular structure.
  • The specific arrangement within the monolayer dictates the photopolymerization outcome, favoring the red PDA form.
  • The study provides critical insights into the structure-property relationships of polydiacetylenes, aiding in the design of novel materials.