Neda Barekzahi; Niloufar Akbarzadeh-T
Abstract
In this project, in the first part, the Schiff base ligand (3-nitrobenzaldehyde + 2-aminothiophenol = H2L) was prepared. Then a nano-complex with the formula [Zn(HL)2Cl2] was synthesized using sonochemical method. Zn-nano-complex was identified by FT-IR, UV-Vis, 1H-NMR and Emission Scanning Electron ...
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In this project, in the first part, the Schiff base ligand (3-nitrobenzaldehyde + 2-aminothiophenol = H2L) was prepared. Then a nano-complex with the formula [Zn(HL)2Cl2] was synthesized using sonochemical method. Zn-nano-complex was identified by FT-IR, UV-Vis, 1H-NMR and Emission Scanning Electron Microscope (SEM). The spectroscopic results showed that the H2L ligand was coordinated to the metal through the N atom. The FT-IR spectrum of Zn-nano-complex showed the vibrational banb of the immunity group (C = N) at 1680-1600 cm-1. The studies obtained from the UV-Vis spectrum confirm n → π* and π→π* intra-ligand transitions. FS-DNA (salmon sperm DNA) and Zn-nano-complex were examined using UV-Vis spectroscopy, fluorescence spectroscopy, and gel electrophoresis. The Stern–Volmer equation was used to calculate the binding constant (Kb) and apparent bimolecular quenching constant (kq) for FS-DNA. Van der Waals forces and hydrogen bonds are important in the interaction between the DNA and the Zn (II) complex, according to an analysis of thermodynamic parameters (∆H°, ΔS° and ΔG°). The interaction mechanism was determined to be the groove-binding mode. These results highlight the complex's complicated effects on DNA structure and the need to use a variety of analytical techniques in order to fully investigate metal-DNA interactions.
Mehdi Taghdiri; Ehsan Hassani-Hemmatabadi; Ehsan Mostofi; Fatemeh Banifatemeh
Abstract
Phosphomolybdate-hexamine-cobalt (PMA-HMT-Co), a new hybrid prepared by coprecipitation method, was used for coating of titanium dioxide nanoparticles in order to improve photocatalytic activity to visible light. PMA-HMT-Co and TiO2-PMA-HMT-Co were characterized by Fourier transform infrared spectroscopy, ...
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Phosphomolybdate-hexamine-cobalt (PMA-HMT-Co), a new hybrid prepared by coprecipitation method, was used for coating of titanium dioxide nanoparticles in order to improve photocatalytic activity to visible light. PMA-HMT-Co and TiO2-PMA-HMT-Co were characterized by Fourier transform infrared spectroscopy, powder X-ray diffraction and scanning electron microscopy. The diffuse reflectance spectroscopy was used to evaluate the band gap variation. The band gap of PMA-HMT-Co decreased and hence, its photocatalytic activity was enhanced under sunlight irradiation. With the incorporation of PMA-HMT-Co, the band gap of titanium dioxide was transferred from UV to visible region successfully. Rhodamine B (RhB) decolorization tests indicated higher photocatalytic activity of TiO2-PMA-HMT-Co under sunlight irradiation. Photodegradation takes place through the excitation of modified titanium dioxide and the creation of holes (h+) and oxidation of dye.
Reza Siavashi; Hadi Beitollahi
Abstract
The molecularly imprinted polymer (MIP) sensor for the rapid and immediate detection of carbidopa (CD) has been investigated. Additionally, a voltammetric sensor based on MIP with a glassy carbon electrode (MIP/GCE) has been developed for CD detection. Under optimal conditions, we observed a strong linear ...
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The molecularly imprinted polymer (MIP) sensor for the rapid and immediate detection of carbidopa (CD) has been investigated. Additionally, a voltammetric sensor based on MIP with a glassy carbon electrode (MIP/GCE) has been developed for CD detection. Under optimal conditions, we observed a strong linear correlation between the sensor's peak current and CD concentrations ranging from 1.0 to 1000.0 μM, with a low limit of detection (LOD) of 0.3 μM (S/N = 3). The modified electrode demonstrated satisfactory electrocatalytic properties for CD oxidation, allowing the sensor to selectively detect CD even in the presence of high concentrations of similar compounds. Furthermore, it was confirmed that MIP/GCE effectively detected CD in urine samples.
