Abstract
Thermally stable ferrocene-α-cyanostilbenes exhibit non-zero dipole moments as well as good structure dependent second order nonlinear optical response.
Highlights
Nonlinear optical (NLO)[1,2,3,4,5] responsive materials are of great interest for applications related to photonics,[6,7] nanophotonics[8] and optoelectronics,[9,10,11,12] such as integrated optics, optical sensing, optical signal processing, optical computing, broad band optical communications, optical poling, optical limiting, etc
Optical nonlinearities,[24,30,31,32] suitably functionalized push–pull dyads (D–p–A) in which electron donor Fc is connected through p-conjugating spacers to strong electron acceptors, have witnessed signi cant interest in their synthesis and properties
The exibility in the structural diversi cation, thermal stability and unique photophysical properties of these p-conjugated luminophores, we report the synthesis, linear optical and nonlinear optical (NLO) properties of new chromophores having a Fc donor and an appropriately substituted aCNS as an acceptor intercepted by a conjugated linker, representing D–A and D–A–D designs
Summary
Nonlinear optical (NLO)[1,2,3,4,5] responsive materials are of great interest for applications related to photonics,[6,7] nanophotonics[8] and optoelectronics,[9,10,11,12] such as integrated optics, optical sensing, optical signal processing, optical computing, broad band optical communications, optical poling, optical limiting, etc. This is corroborated by the positions of the bands deduced from the band tted data (Table 1, see ESI Fig. S2–S6†) as owing to the extensive mixing of transitions in 4–8, the experimental UV-visible absorption data is not in accordance with the established model for simpler Fc derived chromophores with only a single acceptor.[66] Further, during spectro-electrochemistry measurements on 4–8, while the oscillator strength of the HE bands did not change signi cantly, the oscillator strength of the LE bands decreased almost completely upon electrochemical oxidation (see ESI Fig. S14– S17†) of Fc to ferrocenium, which served as additional proof of the LE band to be a MLCT band.
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