page_title: Tetraanthraporphyrin
section_title: Optical properties
hierarchical_section_title: Tetraanthraporphyrin / Optical properties
caption_attribution_description: English: Absorption spectra of tetraanthraporphyrin and it's Pd(II) complex
context_page_description: Tetraanthraporphyrin, or tetraanthra[2,3]porphyrin, is a representative of extended porphyrins.
  Despite promising properties, tetraanthraporphyrins have until recently been little studied. As was theoretically predicted,
  extension of pi-electronic system results in the case of TAPs in the destabilization of the third LUMOs and the first HOMOs that makes it unstable against oxidation and reduction.
context_section_description: Tetraanthraporphyrin exhibit strongly red-shifted and hyperchromic absorption bands. The maximum of absorption is about 830 nm. The molar extinction coefficients reach 10⁻⁵ scale. Very strong red-shift of absorption by about 90 nm upon protonation of nitrogen atoms and blue-shift by 20−40 nm upon metal insertion are observed.
caption: Absorption spectra of tetraanthraporphyrin and it's Pd(II) complex
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