Synthesis and spectral characteristics of some highly soluble squarylium cyanine dyes
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Investigation of transient optical nonlinearity in pyrene-based ferrocene and its optical limiting potential for ultrafast laser absorption
2022, Optical MaterialsCitation Excerpt :Meanwhile, two fluorescence peaks are observed in the detection window, which locate at 409 nm and 434 nm, respectively. Comparing the UV–vis and emission spectra, we can find that the absorption and emission peaks conform to the mirror image rule, indicating minor geometrical differences between the ground and excited state [26–28]. Py-Fc contains electron donor (ferrocene) and acceptor (pyrene) in its molecular structure, which are connected by phenylacetylene and forming D-π-A structure.
Enhanced ultrafast nonlinear absorption and optical limiting of indolium squaraine for laser protection
2022, Optical MaterialsCitation Excerpt :The overlap region between linear absorption and fluorescence emission which will be discussed later may have impact on NLO properties. The fluorescence spectrum is mirror images of the absorption spectrum, with a small Stokes shift, which may suggest the minor geometrical differences between the ground and excited state [28,34,35]. In addition, the typical fluorescence decay trace of ISQ/toluene is presented in Fig. 1(b).
Photochemical studies of new benzothiazole- and benzoselenazole-derived aminosquarylium dyes
2015, TetrahedronCitation Excerpt :However, regarding internal conversion processes, there are also studies that follow an intramolecular charge transfer (ICT) approach, which renders a fluorescence emission that is quenched by this effect. These squarylium dyes consist of two electron-donating end groups (D) and a central electron-withdrawing substituted unit (A) forming a donor–acceptor–donor (D–A–D) alignment, suggesting that both the ground state and the lowest excited singlet state of squaraines involve significant ICT, which is more significant in polar solvents, and that compete directly with the radiative deactivation processes.17–21 There are some reports that point out to a modification of squarylium dyes into radical products by way of an intermediate complex that is formed in multiphotonic processes, with a solvent molecule or solvent radical.
Syntheses of cyanines: A review
2012, TetrahedronLarge third-order optical nonlinearities of centrosymmetric squaraines with heterocyclic donor groups measured by femtosecond degenerate four-wave mixing technique
2007, Chemical Physics LettersCitation Excerpt :It was clarified that the studied squraines show large off-resonant third-order optical nonlinearities. The four centrosymmetric squaraines with indolenium and benzothiazole donor groups were synthesised as described procedures [17–19], and purified by recrystallization and column chromatography. The structural formulae of squaraines investigated here are shown in Fig. 1.