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Unprecedented Strong Panchromic Absorption from Proton-Switchable Iridium(III) Azoimidazolate Complexes.

Adam F Henwood1, Yue Hu2, Muhammad T Sajjad3

  • 1Organic Semiconductor Centre, EaStCHEM School of Chemistry, University of St. Andrews, St. Andrews, Fife, KY16 9ST (UK), Fax: (+44) 1334-463808 URL:http://www.zysman-colman.com.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|November 17, 2015
PubMed
Summary

Two new iridium(III) complexes with unique structures were synthesized. Their distinct absorption properties, tunable by pH, show potential for organic photovoltaic applications.

Keywords:
dyesiridiumorganic photovoltaic applicationspanchromic diazo ligands

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Area of Science:

  • Organometallic Chemistry
  • Photophysics
  • Materials Science

Background:

  • Heteroleptic iridium(III) complexes are crucial in photophysical applications.
  • Aryldiazoimidazole ligands offer unique electronic and structural properties.

Purpose of the Study:

  • To synthesize and characterize novel heteroleptic iridium(III) complexes with aryldiazoimidazole ligands.
  • To investigate the structural and photophysical differences based on imidazole protonation state.
  • To explore their potential as acceptor materials in organic photovoltaics (OPVs).

Main Methods:

  • Synthesis of two distinct iridium(III) complexes under varied conditions.
  • X-ray crystal structure analysis for structural elucidation.
  • UV-Vis absorption spectroscopy to monitor interconversion.
  • Theoretical calculations to understand absorption properties.

Main Results:

  • Two heteroleptic iridium(III) complexes with differing imidazole protonation states were successfully synthesized.
  • X-ray analysis revealed significant structural parameter differences between the complexes.
  • Protonated complex exhibited strong panchromic absorption up to 700 nm; deprotonated complex showed a 100 nm blueshift.
  • Absorption spectra are sensitive to pH, allowing for monitoring of interconversion.

Conclusions:

  • The protonation state of the imidazole ring significantly impacts the structural and photophysical properties of these iridium(III) complexes.
  • The observed tunable absorption characteristics make them promising candidates for organic photovoltaic applications.
  • Further research into their performance in OPVs is warranted.