Abstract
The complexes trans-[Pt(C CC 6H 4-4-C CPh)Cl(PMe 2Ph) 2] ( 1), 1,3,5-C 6H 3{C CC 6H 4-4-C C- trans-[PtCl(PMe 2Ph) 2]} 3 ( 2) and 1,3,5-C 6H 3(C CC 6H 4-4-C C- trans-[Pt(PMe 2Ph) 2]C C-4-C 6H 4C C-3,5-C 6H 3-{C C- trans-[Ru(C CPh)(dppe) 2]} 2) 3 ( 3) have been synthesized and the identity of 1 confirmed by a single-crystal X-ray diffraction study. The optical limiting merit of 1 and 2 has been assessed at 523 nm employing 40 ns pulses; the effective absorption cross-section for 1 is low, while that of 2 is larger, but the complex is susceptible to photo-damage. The third-order nonlinearity of the Ru 6Pt 3 dendrimer 3 has been examined at 800 nm using 150 fs pulses; it is larger than that of a related Ru 6 dendrimer, but smaller than that of a Ru 9 dendrimer under the same conditions, suggesting that increasing metal content and electron richness is correlated to increased nonlinearity in these complexes.
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