The Frenkel exciton Hamiltonian for functionalized Ru(II)-bpy complexes

Victor V. Albert, Ekaterina Badaeva, Svetlana Kilina, Milan Sykora, Sergei Tretiak

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

Electronic excitation energies and wavefunctions are calculated for Ru(bpy)32 (bpy=2,2′bipyridine) and its two derivatives, where one or two bpy ligands are functionalized with carboxyl and methyl groups. We show that the structure of these molecules allows one to express their excitations in terms of wavefunctions localized on individual ligands via the Frenkel exciton model. The model is based on three parameters effective single-ligand excitation energy, inter-ligand interaction coupling, and energy shift brought by the ligand functionalization that are extracted from time-dependent density functional theory (TDDFT). This simple model is able to accurately explain the optical intensity, localization properties, and splitting patterns of the low-energy excited states not only in molecules with a high degree of symmetry, but also in non-symmetrically functionalized Ru(II) complexes in vacuum and in solvent. Such reduced description of the excited states provides better understanding and interpretation of experimental data on Rupolypyridine complexes, and allows for description of excited-state structure in a large ensemble of interacting molecules and treatment of possible charge and energy transfer phenomena in the material.

Original languageEnglish
Pages (from-to)1739-1746
Number of pages8
JournalJournal of Luminescence
Volume131
Issue number8
DOIs
Publication statusPublished - Aug 2011
Externally publishedYes

Keywords

  • DFT
  • Frenkel exciton model
  • Functionalized pyridine
  • Ru(bpy)
  • TDDFT

Fingerprint

Dive into the research topics of 'The Frenkel exciton Hamiltonian for functionalized Ru(II)-bpy complexes'. Together they form a unique fingerprint.

Cite this