Aryl triazenes have been studied for over 130 years concerning their interesting structural, anticancer, and reactivity properties. They have been used in medicinal, combinatorial chemistry, in natural synthesis and as organometalic ligands. 1 Triazenes compounds, characterized by having a diazoamino group (-N=N-N<), commonly adopt a trans configuration in the ground state. 2,3 In this paper, we show the crystal structure of a new triazene ligand (triazene 1,3-di(2-methoxyphenyl) (Fig. 1).The compound was prepared by the following method: A 1 liter flask was charged with 100 g of ice and 150 ml of water and then cooled to 0˚C in an ice-bath. To this was added 12.30 g (0.10 mol) of o-anisidine and 13 g (0.13 mol) of hydrochloric acid (d = 1.18 g/ml). To this solution was added a solution of NaNO2 containing 4.10 g (0.06 mol) in 25 ml of water during a 15 min period. After mixing for 15 min a solution containing 14.76 g (0.18 mol) of sodium acetate in 45 ml of water was added. After mixing for 45 min the brown product was filtered and dissolved in Et2O, and was crystallized in a freezer. Yield, 50% (6.85 g). Recrystallization from Et2O afforded the product as an orange crystalline material. M. P. 95 -97˚C.The crystal structure of triazene-1,3-di(2-methoxyphenyl) was solved by direct methods and refined by full-matrix least squares using the program SHELXTL-98. 4 The H atoms were refined isotropically. The molecular structure of crystalline triazene-1,3-di(2-methoxyphenyl) is presented in Fig. 2
In this research, the electro-catalytic activity of nickel-copper (Ni-Cu) alloy towards oxidation of ethanol and its possible redox process were investigated in alkaline solution. For this purpose, cyclic voltammetry, chronoamperometry and electrochemical impedance spectroscopy techniques were employed. According to the cyclic voltammetry studies, Ni- Cu alloy compared to pure nickel can demonstrate a significantly higher response for ethanol oxidation. So, the enhancement of the anodic peak current corresponding to the oxidation of nickel hydroxide was accompanied with attenuated cathodic current in the presence of ethanol. The anodic peak currents have a linearly dependence on the square root of scan rate which is the characteristic of diffusion-controlled processes. Based on the chronoamperometry measurements, the reaction exhibited a Cottrellian behavior and the diffusion coefficient of ethanol was found to be 1.26 - 10-5 cm2 s-1. The impedance spectroscopy declared electro-catalytic behavior of Ni-Cu electrode for oxidation of ethanol and showed that the charge transfer resistance decreases by increasing the ethanol concentration.
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