Synthesis and properties of photoluminescence and electroluminescence of pyrazoline derivatives

TfOH mediated intermolecular electrocyclization for the synthesis of pyrazolines and its application in alkaloid synthesis

“…17 In addition, the pyrazoline motif is known to exhibit photo-luminescent behaviour due to intra-molecular charge transfer (ICT) in the excited state and also shows hole transport behaviour. [18][19][20][21][22][23][24] Various synthetic approaches have been developed to access these biologically important 1,3,5-trisubstituted pyrazoline/ pyrazole compounds. [25][26][27][28] The most general synthetic approach proceeding via a reaction of 1,3-dicarbonyl compounds with arylhydrazines results in poor regioselectivity.…”

Crystal Structures and Optical Properties of Two Novel 1,3,5-Trisubstituted Pyrazoline Derivatives

“…Amongst the numerous organic luminescent materials, pyrazoline and its derivatives have received increasing attention due to their excellent electro-optical properties and wide range of applications [5][6][7][8][9][10]. In the past decades, although extensive research has focused on the photophysical properties of 1,3,5-triaryl-substituted pyrazolines [11,12], 1-acetyl-pyrazoline derivatives have also attracted a lot of attention because they have many unique advantages [13]. For example, a large number of 1-acetyl-pyrazoline derivatives show high sensitivity and selectivity towards different metal ions and can be used as fluorescent sensors [14].…”

Highly fluorescent semiconducting pyrazoline materials for optoelectronics

“…Some pyrazoline compounds have widely been used as whitening or brightening reagents for synthetic fibers, as fluorescence probes in some refined chemosensors, as fluorescent chemosensors for recognition of transition metal ions, as hole-transport materials in electrophotography and electroluminescence [12][13][14][15]. The ICT and push-pull effect of pyrazoline derivatives made them an optimistic candidate for electroluminescent emitter referable to high transfer efficiency from electric energy to light energy as well as longer luminescence [16].…”