Second Harmonic Generation and Two-Photon Fluorescence as Nonlinear Optical Properties of Dipolar Mononuclear Sesquifulvalene Complexes

Ferrocene: An unrivaled electroactive building block for the design of push-pull dyes with near-infrared and infrared absorptions

“…Ferrocene has been extensively studied in the literature for the design of NLO-active chromophores due to its low oxidation potential and its remarkable electron-donating ability [149][150][151][152][153][154] and the diiron-bridged unit [155][156][157][158][159][160]. With aim at examining the influence of the π-conjugated spacer, a series of 10 merocyanine salts were designed and obtained with yields ranging from 49% for M26 until 72% for M22 (See Fig.…”

Structure−Property Dependence of the First Hyperpolarisabilities of Organometallic Merocyanines Based on the μ-Vinylcarbynediiron Acceptor and Ferrocene Donor

“…When the aldehydes 2؊11 were condensed with [Fe 2 (η- [37] (12) in CH 2 Cl 2 at 35°C for 12 h, they gave intensely coloured reaction mixtures. The air-stable merocyanine salts [Fe 2 (η-…”

“…[58Ϫ61] However, there are now several methods which may be used to discriminate between a true SHG signal and a TPAFenhanced one, e.g. the use of bandpass filters [12,22] or a scanning monochromator. [62] Also, numerous techniques have been developed to avoid or abstract the TPAF contribution to β: long wavelength measurement, [63Ϫ65] time-resolved HRS, [66] high-frequency demodulation [67] and the measurement of the TPAF spectrum to abstract the fluorescence contribution to the HRS signal.…”

A facile organolithium route to ferrocene-based triarylmethyl dyes with substantial near IR and NLO properties

“…These include the ordinary EWGÕs, i.e., -NO 2 , -CN, -CH@O, -CO 2 CH 3 [6], as well as other, more novel electron-withdrawing functionalities. The latter category contains groups derived from 3-(dicyanomethylidene)-2,3-dihydrobenzothiophene-1,1-dioxide, 1,3-diethyl-2-thiobarbituric acid, 4-methyl-(2-phenyl)-thioflavilium perchlorate [7], the tropylium cation as well as a number of organometallic moieties [8]. A particularly effective EWG was shown to be a tungsten Fischer carbene moiety in conjugation with a ferrocenyl group through four double bonds.…”