Ruthenium(II)-cored polythiophene dendrimers

Suxiang Deng, Greg Krueger, Prasad Taranekar, Saengrawee Sriwichai, Ruifa Zong, Randolph P. Thummel, Rigoberto C. Advincula

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

We report the synthesis and characterization of ruthenium(II)-cored polythiophene dendrimers. Four new redox-active ruthenium(II) pyridine oligothiophene dendritic complexes that fluoresce in the near-infrared region have been synthesized, and their absorption spectra, fluorescence properties, and redox behavior have been investigated. The dendritic ligands phen3T and phen7T containing 1,10-phenanthroline as chelating sites and two oligothiophene dendrons (3T6COMe and 7T6COMe) have been synthesized and employed. The metal-polythiophene dendrimers investigated here are [Ru(bpy) 2(phen3T)]2+, [Ru(bpy)2(phen7T)]2+, [Ru(phen3T)3]2+, and [Ru(phen7T)3] 2+. Upon addition of acid, the charge transfer absorption bands of free dendritic ligands are significantly red-shifted and the fluorescence is greatly quenched. The Ru(II) polythiophene dendrimers exhibit very strong metal-to-ligand charge transfer (MLCT) absorption and enhanced absorption in the UV region and can be regarded as better light-harvesting species. The MLCT emission is extraordinarily red-shifted (∼165 nm) because of their planar excited states. The core of the dendrimers shows an electrochemical behavior typical of encapsulated metal electroactive units.

Original languageEnglish
Pages (from-to)3302-3311
Number of pages10
JournalChemistry of Materials
Volume23
Issue number14
DOIs
Publication statusPublished - 2011 Jul 26
Externally publishedYes

Keywords

  • dendrimers
  • metal-to-ligand charge transfer
  • oligothiophene
  • ruthenium

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry

Fingerprint Dive into the research topics of 'Ruthenium(II)-cored polythiophene dendrimers'. Together they form a unique fingerprint.

  • Cite this

    Deng, S., Krueger, G., Taranekar, P., Sriwichai, S., Zong, R., Thummel, R. P., & Advincula, R. C. (2011). Ruthenium(II)-cored polythiophene dendrimers. Chemistry of Materials, 23(14), 3302-3311. https://doi.org/10.1021/cm200228p