D-π-A chromophores with a quinoxaline core in the π-bridge and bulky aryl groups in the acceptor: Synthesis, properties, and femtosecond nonlinear optical activity of the chromophore/PMMA guest-host materials

Synthesis of cross-linked polyurethane elastomers with the inclusion of polar-aromatic moieties (BA, PNBA and 3, 5-DNBA): Electrical and thermo-mechanical properties analysis

“…Hitherto, many researchers have demonstrated and found that doping a nonpolar polymer with polar dopants is a highly general strategy and has the potential to lead the materials with considerably higher piezoelectric responses, thermal stability, high-performance NLO materials, and also impact on electrical properties [4,10,[16][17][18][19][20][21][22][23][24][25]. One of the most important classes of polymer for such application is polyurethane.…”

Composing NLO Chromophore as a Puzzle: Electrochemistry‐based Approach to Design and Effectiveness

“…The divinyl quinoxalinone bridge, in IIaz , IIav , IIaw , turns out to be the most effective among those discussed from the point of view of achieving the smallest energy gap; this bridge is more effective than quinoxaline one in Iaz , Iav , Iaw , (see pairs differing only by these bridges: Iav/IIav , Iaz/IIaz , Iaw/IIaw ) (Table S3). The smallest, ΔE el , 0.95 eV is obtained for IIaz [43] and IIaw [45] providing enhanced values of first hyperpolarizability, [43] thus demonstrating the specific properties of divinyl quinoxalinone bridge. The chromophore with quinoxaline bridge, Iaz , has the value of E HOMO comparable with that for IIaz but less stabilized E LUMO and larger ΔE el −1.04 eV.…”

“…Among various kinds of D‐π‐A chromophores, recent studies have focused on the modification of the π‐conjugated linkers, [42–55] which can modulate E HOMO and E LUMO , facilitate light harvesting, and hence play a vital role in the intramolecular electron density redistribution process. Various five‐ and six‐membered heterocycles, as well as polyenes were utilized as suitable π‐conjugated chromophore backbones.…”

“…In this respect, benzene, five‐membered thiophene, diazoles, and diazines, including quinoxalines and quinoxalinones seem to be suitable parent π‐conjugated backbones [42–55] . However, comparison of the effectiveness of bridges of different nature with each other was carried out rarely.…”

Optical Characterization of Ultra-Thin Films of Azo-Dye-Doped Polymers Using Ellipsometry and Surface Plasmon Resonance Spectroscopy

“…Azo-dye-containing materials have been studied extensively in past decades for applications in holography and optical data storage [28,29], nonlinear optics (NLO), electro-optic modulation (EO), second-harmonic generation (SHG) [30][31][32][33], photomechanical actuation and matter motion, and so on [34][35][36][37][38][39][40]. Azo dyes also have potential applications in dye chemistry and bio-photonics [41,42], driving a natural interest in their optical characterization, namely the determination of the real and imaginary parts of n c as a function of the wavelength of light.…”