Versatile optical materials: fluorescence, non-linear optical and mesogenic properties of selected 2-pyrazoline derivatives

Near-infrared luminescence emitted by an electrically switched liquid crystal cell

“…The availability of near-ultraviolet-emitting diodes facilitates the development of emissive liquid crystal displays [4,5]. Several studies focused on fluorescent (or luminescent) liquid crystals [6][7][8][9][10][11][12][13][14], but only few metalcontaining luminescent liquid crystal systems have been described [15][16][17][18][19][20][21][22]. Luminescent liquid-crystalline materials can also be used to generate polarized emission [23,24].…”

Size tuned electrophoretic pyrazoline nanoparticles prepared through dispersion–polymerization

“…While the size dependent flourescent properties of perylene and phthalocyanine nanoparticles have been demonstrated by Nakanishi et al [12], Fu and Yao have reported the size dependent optical properties of 1-phenyl-3-((dimethylamino)styryl)-5-((dimethylamino)phenyl)-2-pyrazoline (PDDP) nanoparticles [11]. Pyrazoline derivatives have been widely used as the optical brighteners for synthetic textiles, papers, fabrics and hole-conveying mediums in photoconductive materials owing to their strong fluorescence [13][14][15][16][17]. Recently, we have reported the synthesis of size-tunable nanoparticles of 1-phenyl-3-naphthyl-5-((dimethylamino)phenyl)-2-pyrazoline (PNDP) from ten to hundreds of nanometers via reprecipitation method, and their size dependent optical properties [18,19].…”

Tuning the photophysics of a bio-active molecular probe ‘3-pyrazolyl-2-pyrazoline’ derivative in different solvents: Dual effect of polarity and hydrogen bonding

“…Further, 2-pyrazoline derivatives are also considered to be important organic heterocyclic 'transition' materials and find use in organic molecular crystals [22]. Photophysical studies with some of these newly synthesized 2-pyrazoline derivatives [23][24][25][26][27][28][29][30] clearly demonstrate their potential application as fluorescent probes in some chemosensors and as nanoparticles in optoelectronic device [31][32][33]. The compound is highly fluorescent due to extended conjugation from 2-pyrazoline ring to pyrazole.…”