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.
Sohrab Ershad; Lotf-Ali Saghatfroush; Fereshteh Azarm
Volume 3, Issue 1 , March 2016, , Pages 49-54
Abstract
A new optode for the sensitive and selective determination of copper (II) ion based on a change in absorption spectrum of a polymeric thin film in aqueous solution was proposed. A composed membrane of polyvinylchloride, different plasticizers and oleic acid as anionic additive was prepared. The influence ...
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A new optode for the sensitive and selective determination of copper (II) ion based on a change in absorption spectrum of a polymeric thin film in aqueous solution was proposed. A composed membrane of polyvinylchloride, different plasticizers and oleic acid as anionic additive was prepared. The influence of different plasticizers on sensitivity, linear range and selectivity of the membrane film were studied. Satisfactorily, analytical sensing characteristics, to determine of the copper ion in terms of the selectivity, reversibility and reproducibility in a good detecting range were obtained. In addition, the optical film responds to copper (II) ion, irreversibly, over a wide dynamic range 3.1×10-10 to 2.3×10-4 M with a response time ≈ 5 Min obtained confidently. The optode membrane was successfully, applied to determination of copper (II) ion in spiked samples.
Nasrin Soltani; Hosein Salavati; Mehrnoosh Paziresh; A. Moghadasi
Volume 2, Issue 1 , March 2015, , Pages 22-35
Abstract
The corrosion inhibition characteristics of two synthesized Schiff bases, namely N, N´-bis(2-hydroxy-6-nitrobenzaldehyde) benzidine and N, N´-bis(salysylaldehyde) benzidine, on the mild steel corrosion in 2.0 M hydrochloric acid have been investigated by weight loss, potentiodynamic ...
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The corrosion inhibition characteristics of two synthesized Schiff bases, namely N, N´-bis(2-hydroxy-6-nitrobenzaldehyde) benzidine and N, N´-bis(salysylaldehyde) benzidine, on the mild steel corrosion in 2.0 M hydrochloric acid have been investigated by weight loss, potentiodynamic polarization and electrochemical impedance spectroscopy techniques. These studies were carried out at different concentrations, temperatures and durations. Polarization measurements indicate that the two inhibitors act as mixed type inhibitors. The adsorption of inhibitors obeys the Langmuir adsorption isotherm and the thermodynamic parameters (Ea, Kads, ΔG0ads) were calculated and discussed. Quantum chemical calculations were performed to provide further insight into the inhibition efficiencies determined experimentally.
