Title: Organometallic complexes for nonlinear optics. Part 36. Quadratic and cubic optical nonlinearities of 4-fluorophenylethynyl- and 4-nitro-(E)-stilbenylethynylruthenium complexes
Authors: Morrall, JPL ×
Cifuentes, MP
Humphrey, MG
Kellens, R
Robijns, Elke
Asselberghs, Inge
Clays, Koen
Persoons, Andre
Samoc, M
Willis, AC #
Issue Date: Feb-2006
Publisher: Elsevier science sa
Series Title: Inorganica Chimica Acta vol:359 issue:3 pages:998-1005
Abstract: The complexes trans-[Ru(C&3bond; C-4-C6H4F)X(dppe)(2)] [X = Cl (1), C&3bond; CPh (2), C&3bond; C-4-C6H4NO2 (3)], trans-[Ru{C&3bond; C-4-C6H4-(E)-CH=CH-4-C6H4NO2}X(dppe)(2)] [X = C&3bond; CPh (4), C&3bond; C-4-C6H4C&3bond; CPh (5)], and [C6H3-1,3-{C&3bond; C-trans-[RuCl(dppe)(2)]}(2)-5-(C&3bond; C4-C6H4F)] (6) have been synthesized and the identity of 1 confirmed by a single-crystal X-ray diffraction study. Cyclic voltammetry reveals a metal-centered oxidation, the potential of which is largely invariant on alkynyl ligand replacement across the series 1-5; the diruthenium complex 6 shows two oxidation processes, consistent with weakly interacting metal centers. Hyper-Rayleigh scattering (HRS) studies at 1064 nm using ns pulses suggest quadratic nonlinearities for 3-5 that are amongst the largest thus far for organometallic complexes, a trend maintained with the two-level-corrected data. HRS studies at 800 nm using fs pulses and amplitude modulation to remove multi-photon fluorescence contributions reveal significant fluorescence-free nonlinearities for 3-5; the frequency-independent nonlinearities calculated from the 800 mn results are suggestive of fluorescence contributions to the 1064 mn data. Z-scan studies at 820 nm reveal cubic nonlinearities that increase with the size of the pi-system, although error margins are significant. (c) 2005 Elsevier B.V. All rights reserved.
ISSN: 0020-1693
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Molecular Imaging and Photonics
× corresponding author
# (joint) last author

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