An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
The electrochemiluminescence (ECL) behavior of pyronin derivatives was reported. We found that these derivatives, as novel ECL emitters, generated an efficient emission phenomenon; that is, they showed anodic emission using tri-propylamine (TPA) as the coreactant and cathodic ECL emission using K 2 S 2 O 8 as the coreactant. Because of its remarkable luminescent performance, the ECL mechanism (reductive-oxidative and oxidative-reductive) of benzylthiol-substituted pyronin (BTP) was specifically studied. Surprisingly, the cathodic ECL emission of BTP had a lower ECL peak potential at −0.54 V (vs. SCE) in aqueous solution. The potential range of −0.7 V to 0.0 V is lower than that of previously reported K 2 S 2 O 8 cathodic ECL systems. Its good water solubility, easy modification, and excellent emission properties facilitate appealing (bio)analytical applications in ECL biosensors and cell imaging.
A conductive carbon black-graphene (CCB-GR) modified glassy carbon electrode (CCB-GR/GCE) has been fabricated and used for determination of rutin. Transmission electron microscopy (TEM) results indicated that CCB-GR was successfully prepared. Cyclic voltammetry (CV) and differential pulse voltammetry (DPV) results showed that CCB-GR/GCE exhibited an excellent electrochemical performance. The sensing platform showed wide linear responses for rutin from 1×10-9 to 1×10-4 mol L-1 with a detection limit of 3.3×10-10 mol L-1 (S/N = 3). The CCB-GR/GCE showed excellent sensitive with good stability toward the determination of rutin content in tablet.
Copolymerization of diacids and diamines can produce copolyamides with diversified physical properties. Due to the interplay between even–even and odd–even diamine-diacid units, the even–even/odd–even copolyamides can show much different crystal polymorphism and phase transition behavior from the typical (co)polyamides. Herein, we synthesized the novel even–even/odd–even copolyamides from nylon 5,6 and nylon 6,6 salts and investigated their crystallization kinetics, crystalline structure, and phase transition behavior. The copolyamides display the typical isodimorphic behavior, and the solution-crystallized copolyamides experience α–γ Brill transition upon heating. Intriguingly, the crystalline structure and phase transition of copolyamides are strongly influenced by the copolymer composition and initial crystallization temperature (Tc) upon cooling due to the possible change of H-bonding structure regularity induced by the incorporated comonomer units in the crystalline phase. The 66-unit-rich copolyamides initially form the γ phase and subsequently transform into the α phase during cooling, while the 56-unit-rich ones merely crystallize in the γ phase. For the copolyamide with pseudoeutectic composition, high and low Tc promote the generation of single γ phase of PA6,6 and double γ phases of PA5,6 and PA6,6, respectively. Upon cooling, the PA6,6-type γ phase always transforms into the α phase, while the PA5,6-type γ phase is maintained. This study has elucidated the synergetic effects of copolymer composition and Tc on the crystallization and phase transition of isodimorphic copolyamides.
Room-temperature phosphorescence (RTP) logic gates were developed using capture ssDNA (cDNA) modified carbon dots and graphene oxide (GO). The experimental results suggested the feasibility of these developed RTP-based "OR", "INHIBIT" and "OR-INHIBIT" logic gate operations, using Hg2+, target ssDNA (tDNA) and doxorubicin (DOX) as inputs.
The inherent advantages of 2D/2D S-scheme heterojunction contribute well to the photocatalysis due to efficient carriers’separation kinetics and maintained redox ability. However, single 2D/2D S-scheme heterostructure cannot produce a perfect energy band alignment effect since the material contact interface is not perfectly contacted in real circumstance because of surface roughness. Herein, the Schottky junction synergies with S-scheme (S-S strategy) is proposed to overcome the difficulty above. CNQDs are utilized to construct Schottky junction in S-scheme TCN/ZnIn 2S4 to optimize the carriers’ separation kinetics in some area without intimate contact of TCN/ZnIn2S4 . SI-XPS, UPS, and KPFM etc confirms such electron state in material. The CNQDs/TCN/ZnIn2S4 photocatalysts exhibits high degree of dissociation efficiency of photoinduced excitons due to S-S strategy. The results testify construction of S-S heterostructure would be an effective strategy for carriers’modulation, and it will be a promising candidate for “green” elimination of oil spill on water surface.
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