Abstract In this paper we report on the rate of oxidation of ethyl mercaptan and its dimer ethyl mercaptan disulfide by alkaline hexacyanoferrate(III) along with its mechanistic pathway, spectrophotometrically. The influence of different experimental parameters, such as change in concentration of EtSH, HCF, OH − and reaction temperature was studdie. It was observed that the order of reaction decreases in [EtSH] or [OH − ] from first order to higher concentration, but it certainly did not tend towards zero order. The effect of surfactants on the rate of reaction was observed at the critical micelle concentration (CMC) of the surfactant and reported to be below the CMC. The investigators, thus, concluded that the added products have an insignificant effect on the reaction rate. Further, the activation parameters were evaluated which lend support to the proposed mechanism. The thermodynamic quantities were also determined and the binding parameters have also been evaluated using the Menger and Portnoy model.
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.
Abstract. A novel solvatochromic ferrocenyl methine dyes has been synthesized by condensation of ferrocen-3-caboxaldehyde with active methylene compounds under Knoevengel conditions and characterized by UV-vis in a range of solvents. Compound 1a has a red shift in π-π* and a blue shift increases with solvent polarity in the MLCT (M→A) while 1b-1d variation of red as well as blue shifts from both states. No d-d transition is observed in these compounds. These shifts are interpreted by different dipole moments in the ground and excited state as well as solvent interaction between solute/solvent and H-bonding with the acceptor.
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.
In the title compound, C(15)H(13)N(3)O(2), the dihedral angle between the benzotriazole ring system (r.m.s. deviation = 0.0124 Å) and the benzene ring is 76.21 (3)°. The meth-oxy C atom deviates from its benzene ring plane by 0.063 (2)Å. In the crystal, inversion dimers linked by pairs of C-H⋯O hydrogen bonds generate R(2) (2)(12) loops.
Porphyrins are a kind of aromatic molecules possessing unique physic-chemical properties. In this manuscript, it was thus utilized to synthesize 5,10,15-tris(4-aminophenyl)-20-phenylporphyrin and cobalto(5,10,15-tris(4-aminophenyl)-20-phenylporphyrin). In addition, conducting cobalto(5,10,15-tris(4-aminophenyl)-20-phenylporphyrin) polymeric films were successfully prepared by electropolymerization approach on glassy carbon electrode in the presence of dimethyl formamide solution and 0.1 M tetra-n-butyl ammonium perchlorate at 100 mV/s scan rate. The synthesized polymeric films were evaluated as the active electrode materials to detect an antioxidant (Antipyrine) present in pharmaceuticals and the limit of detection is ~ 74 μM.
In the title compound, C(20)H(19)N(5)O(3)S·H(2)O, the pyrazole ring is connected to a pyrazolone ring, and the two five-membered rings are aligned at 45.0 (1)°. The pyrazole ring is connected to a phenyl ring and the two are twisted by 42.7 (1)°. Finally, the pyrazolone ring is connected to a benzene ring and the two are twisted by 19.5 (1)°. The N-H and -NH(2) portions and the solvent water mol-ecules are engaged in N-H⋯N, N-H⋯O and O-H⋯O hydrogen-bonding inter-actions to generate a three-dimensional network.
Abstract In this approach, vanadium pentoxide nanorods (V 2 O 5 NRs) were prepared by utilizing a facile wet‐chemical approach (WCA) in an alkaline phase at low temperatures then applied to detect acetylcholine. Various optical techniques, such as Ultra‐Violet spectroscopy (UV‐Visible), Fourier Transform Infra‐red spectroscopy (FTIR), Powder X‐ray Diffraction (XRD), Field Emission Scanning Emission Microscopy (FESEM), X‐ray Electron Dispersive Spectroscopy (XEDS) and X‐ray Photo‐electron Spectroscopy (XPS) were applied to analyse the V 2 O 5 NRs for structural, optical, functional, morphological and elemental analyses. Adjustment of the light weight fabrication of NRs onto Glassy carbon electrode (GCE) exhibited sensitive and selective acetylcholine sensor probe. Based on the stable current‐voltage relationship, analytical sensing parameters like sensitivity, Linear dynamic range (LDR), Limit of detection (LOD), Limit of quantification (LOQ), durability and interference measurement of the fabricated sensor (GCE/V 2 O 5 NRs/BPM) for acetylcholine detection were evaluated and reported in this paper. Here, Nafion was used as a binding polymer matrix (BPM) for the fabrication of flat GCE with V 2 O 5 NRs. Acetylcholine calibration curve was found to be linear throughout in a broad range of concentration of target acetylcholine analyte. Calibration curve was employed to calculate the sensing parameters such as sensitivity (101.27 nAμM −1 cm −2 ), LOD down to 11.58 pM, LOQ (38.60 pM) and LDR (100 pM∼100 μM) of the developed GCE/V 2 O 5 NRs/BPM sensor probe. The use of the facile WCA method for the synthesis of low‐dimensional V 2 O 5 NRs is a good strategy for developing an un‐doped nano‐material based sensor for enzyme‐free bio‐molecule recognition and detection via this electrochemical approach. The developed (GCE/V 2 O 5 NRs/BPM) sensor probe could be used to selectively detect acetylcholine in real biological samples by electrochemical method with satisfactory outcomes.
