Third-harmonic generation in organometallic ruthenium(II) derivatives containing coordinated p-substituted benzonitriles
- 1 January 1995
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of Materials Chemistry
- Vol. 5 (11) , 1861-1865
- https://doi.org/10.1039/jm9950501861
Abstract
A family of η5-monocyclopentadienylruthenium(II) derivatives possessing coordinated p-substituted benzonitriles has been studied by optical third-harmonic generation (THG) at the fundamental wavelength of λ= 1064 nm. Thin films of the compounds in a polymer matrix of poly(methyl methacrylate)(PMMA) were studied using the Maker fringe technique. For the compound possessing the p-NCC6H4C6H4NO2 coordinated nitrite the second hyperpolarizability, γ(–3ω;ω,ω,ω), was determined to be 2.3 × 10–33 esu. Spectroscopic results show evidence of π back-donation resulting in an extension of the electronic π-system. We propose that this π back-donation is the origin of this significant value of γ.Keywords
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