Organometallic complexes for non-linear optics. 49. Third-order non-linear optical spectral dependence studies of arylalkynylruthenium dendrimers

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Journal Article
Australian Journal of Chemistry, 2011, 64 (9), pp. 1267 - 1271
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The cubic hyperpolarizabilities of 1,3,5-(trans-[RuCl(dppe) 2(C≡CC6H4-4-C≡C)])3C 6H3 (1), 1,3,5-(trans-[Ru(C≡CPh)(dppe) 2(C≡CC6H4-4-C≡C)])3C 6H3 (2), 1,3,5-(trans-[Ru(C≡CC6H 4-4-NO2)(dppe)2(C≡CC6H 4-4-C≡C)])3C6H3 (3), 1,3,5-{trans-[Ru(C≡C-3,5-(trans-[Ru(C≡CPh)(dppe)2(C≡CC 6H4-4-C≡C)])2C6H 3)(dppe)2(C≡CC6H4-4-C≡C)]} 3C6H3 (4), and 1,3,5-{trans-[Ru(C≡C-3,5- (trans-[Ru(C≡CC6H4-4-NO2)(dppe) 2(C≡CC6H4-4-C≡C)])2C 6H3)(dppe)2(C≡CC6H4-4- C≡C)]}3C6H3 (5) have been assessed over the spectral range 5201600nm using the Z-scan technique and ∼150 fs pulses. All complexes exhibit negative values of γreal (corresponding to self-defocusing behaviour) and significant positive values of imag (corresponding to two-photon absorption) at short wavelengths (up to 1000nm). The maximal values of γreal and γimag increase in magnitude on dendrimer generation increase (proceeding from 2 to 4 or 3 to 5). The open-aperture Z-scan results have been used to confirm and contrast the two-photon (2PA) and three-photon absorption (3PA) behaviour of 1-5, the data being consistent with the existence of 2PA at the short wavelength range, but with significant 3PA at longer wavelengths for 1-3 and 5, a record 3PA coefficient for an inorganic complex for 5 at 1180nm, and appreciable 3PA at the telecommunications wavelength of 1300nm. © 2011 CSIRO.
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