Organometallic complexes for nonlinear optics. 37: Synthesis and third-order nonlinear optical properties of a hexarutheniumtriplatinum dendrimer

The complexes trans-[Pt(CCC6H4-4-CCPh)Cl(PMe2Ph)2] (1), 1,3,5-C6H3{CCC6H4-4-CC-trans-[PtCl(PMe2Ph)2]}3 (2) and 1,3,5-C6H3(CCC6H4-4-CC-trans-[Pt(PMe2Ph)2]CC-4-C6H4CC-3,5-C6H3-{CC-trans-[Ru(CCPh)(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 Ru6Pt3 dendrimer 3 has been examined at 800 nm using 150 fs pulses; it is larger than that of a related Ru6 dendrimer, but smaller than that of a Ru9 dendrimer under the same conditions, suggesting that increasing metal content and electron richness is correlated to increased nonlinearity in these complexes.

The optical limiting merit of trans-[Pt(CCC6H4-4-CCPh)Cl(PMe2Ph)2] (1) and 1,3,5-C6H3{CCC6H4-4-CC-trans-[PtCl(PMe2Ph)2]}3 (2) has been assessed, the effective absorption cross-section for 1 being low, while that of 2 is larger. The third-order nonlinearity of 1,3,5-C6H3(CCC6H4-4-CC-trans-[Pt(PMe2Ph)2]CC-4-C6H4-3,5-C6H3-{CC-trans-[Ru(CCPh)(dppe)2]}2)3 (3) is larger than that of a related Ru6 dendrimer, but smaller than that of a Ru9 dendrimer, suggesting that increasing metal content and electron richness is correlated to increased nonlinearity in these complexes.Figure optionsDownload as PowerPoint slide