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• 22532-62-3 4-bromosalicylaldehyde 
• 201802-67-7 4-(diphenylamino)phenyl boronic acid 

Relevant academic research and scientific papers

Electrospun nanofibrous sheet doped with a novel triphenylamine based salicylaldehyde fluorophore for hydrazine vapor detection

Successful synthesis of a novel triphenylamine based salicylaldehyde fluorophore (compound 1) was performed via Suzuki cross-coupling reaction. Subsequently, the identification the hydrazine vapor of an electrospun nanofiber sheet combined with compound 1 depending on solid condition was described. Furthermore, cellulose acetate (CA) combined with the electrospun nanofiber sheet based on compound 1 was formed by applying the electrospinning technique where the average diameter was 324.6 ± 91.6 nm. The sensing nanofiber sheet exhibited a sensitive and selective reaction to hydrazine vapor with a linear concentration range of 0.2-1 %w/v in aqueous solution according to the analysis of fluorescence images using ImageJ. Moreover, it exhibited the elevated selectivity with hydrazine across 21 convenient interferences. Initial findings revealed the nanofibrous mat's sensitivity and selectivity in terms of the identification of hydrazine via naked-eye detection under backlight 365 nm with fluorescent turn-off mode. Additionally, the generation of compound 1 and the hydrazone product (compound 1-HZ) was investigated through the use of 1H-NMR titration and HRMS, which affirmed the formation of hydrazine with a proton chemical shift at 7.95 ppm, HRMS of compound 1-HZ at m/z = 380.1764 [1-HZ+H]+). It has been demonstrated that the nanofibrous mat offers a basic and suitable method for detecting water vapour in water environments as well as industrial chemical setting.

Visual detection of viscosity through activatable molecular rotor with aggregation-induced emission

Food safety has become one of the urgent affairs in the global public health studies, and irregular viscosity is closely associated with the food spoilage extent. In this study, one kind of activatable molecular rotor (TPA-PBZ) based on triphenylamine derivates has been synthesized via the Schiff base condensation reaction. This rotor is comprised by donor-accepter conjugated structure, with aggregation induced-emission feature and a large Stokes shift of 160 nm in water. The rotation of aromatic rings in TPA-PBZ is restricted in high-viscosity microenvironment, with the gradually increasing fluorescence emission signal at 568 nm. Significantly, this rotor TPA-PBZ has successfully been applied not only in the determination of thickening effects of food gum, but also in the detection of viscosity enhancement during the liquid food spoilage process. This molecular rotor can be utilized as an intelligent monitor platform for food quality and safety inspection in viscosity-related conditions.

Strongly Luminescent Tungsten Emitters with Emission Quantum Yields of up to 84 %: TADF and High-Efficiency Molecular Tungsten OLEDs

Metal-TADF (thermally activated delayed fluorescence) emitters hold promise in the development of next generation light-emitting materials for display and lighting applications, examples of which are, however, largely confined to CuI and recently AuI, AgI, and AuIII emitters. Herein is described the design strategy for an unprecedented type of metal-TADF emitter based on inexpensive tungsten metal chelated with Schiff base ligand that exhibit high emission quantum yields of up to 56 % in solutions and 84 % in thin-film (5 wt % in 1,3-bis(N-carbazolyl)benzene, mCP) at room temperature. Femtosecond time-resolved emission (fs-TRE) spectroscopy and DFT calculations were undertaken to decipher the TADF properties. Solution-processed OLEDs fabricated with the W-TADF emitter demonstrated external quantum efficiency (EQE) and luminance of up to 15.6 % and 16890 cd m?2, respectively.