Probing the symmetry of the nonlinear optic chromophore Ru(trans-4,4'- diethylaminostyryl-2,2'-bipyridine)32+: Insight from polarized hyper- Rayleigh scattering and electroabsorption (Stark) spectroscopy

Fredrick W. Vance, Joseph T. Hupp

Research output: Contribution to journalArticle

109 Citations (Scopus)

Abstract

Polarized hyper-Rayleigh scattering (HRS) has been used to interrogate a putative octupolar 'super' chromophore Ru(trans-4,4'-diethylaminostyryl- 2,2'-bipyridine)32+. While the hyperpolarizability (β) is impressive, it is apparent from polarized HRS measurements that the symmetry of the excited state, and thus the hyperpolarizability tensor, is best described as dipolar in nature. Electroabsorption (electronic Stark effect) experiments support these findings, implying that changes in dipole moment (Δμ) accompany optical excitation. The measured |Δμ| contributions from both metal-to- ligand charge transfer and intraligand transitions have been used to model the wavelength-dependent hyperpolarizability; reasonable qualitative agreement between experimental results and a simple three-state, two-level dipolar model is obtained.

Original languageEnglish
Pages (from-to)4047-4053
Number of pages7
JournalJournal of the American Chemical Society
Volume121
Issue number16
DOIs
Publication statusPublished - Apr 28 1999

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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