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Stability due to peripheral halogenation in phthalocyanine complexes.

Masanori Koshino1, Hiroki Kurata, Seiij Isoda

  • 1Institute for Chemical Research, Kyoto University, Uji, Kyoto, 611-0011, Japan. m-koshino@aist.go.jp

Microscopy and Microanalysis : the Official Journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada
|March 21, 2007
PubMed
Summary

Peripheral halogenation affects molecular changes in vanadyl-phthalocyanine and copper-phthalocyanine families. Oxygen loss in VOPcX and intermolecular space in CuPcX influence electron sensitivity and radiation damage durability.

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Published on: March 20, 2014

Area of Science:

  • Materials Science
  • Chemistry
  • Physics

Background:

  • Phthalocyanines are organic semiconductors with diverse applications.
  • Peripheral halogenation significantly influences their electronic and structural properties.
  • Understanding radiation damage is crucial for their stability in electronic devices.

Purpose of the Study:

  • To investigate the impact of peripheral halogenation on molecular changes and crystalline disintegration in vanadyl-phthalocyanine (VOPcX) and copper-phthalocyanine (CuPcX) families.
  • To elucidate the mechanisms of electron radiation damage in these materials.
  • To correlate material properties with radiation durability.

Main Methods:

  • Analytical transmission electron microscopy (TEM) for structural analysis.
  • Thermal analyses (TGA) to determine decomposition temperatures (Td).
  • Electron energy-loss spectroscopy (EELS) and energy loss near edge structures (ELNES) to probe molecular transformations and elemental composition.

Main Results:

  • Elemental mass remained constant up to 0.5 C x cm(-2), except for oxygen loss in VOPcF14.5, potentially increasing radiation damage.
  • CuPcF16 showed no mass variation, but ELNES indicated nitrogen's pi system is more radiation sensitive than carbon.
  • Electron sensitivity in VOPcX is linked to oxygen elimination, while CuPcX sensitivity is dominated by intermolecular empty space.
  • Decomposition temperature (Td) and characteristic dose (D1/e) exponentially correlate with effective molecular occupancy (Oe).

Conclusions:

  • Peripheral halogenation influences electron radiation sensitivity through oxygen elimination or intermolecular space.
  • Effective molecular occupancy is a key parameter for predicting phthalocyanine durability under electron irradiation.
  • The study provides insights into designing more radiation-stable phthalocyanine-based materials.