Acetonitrile

About: Acetonitrile is a research topic. Over the lifetime, 11298 publications have been published within this topic receiving 175275 citations. The topic is also known as: cyanomethane & ethyl nitrile.

Electrochemical Polymerization of Fluoranthene and Characterization of Its Polymers

Abstract: A novel inherently conducting polymer, high-quality polyfluoranthene (PFA) film with electrical conductivity of 10-2 S cm-1, was first synthesized electrochemically by direct anodic oxidation of fluoranthene in a middle strong Lewis acidboron trifluoride diethyl etherate. The oxidation potential onset of fluoranthene in this medium was measured to be only 1.07 V vs SCE, which was much lower than that in acetonitrile + 0.1 mol L-1 tetrabutylammonium tetrafluoroborate (1.68 V vs SCE). This PFA film showed good redox activity and stability even in concentrated sulfuric acid. Moreover, the fluorescence properties of PFA were greatly improved in comparison with those of the monomer. Dedoped PFA films were partly soluble in polar solvents such as CH2Cl2, acetone, tetrahedrofuran, and dimethyl sulfoxide. The structure and morphology of the polymer were investigated by UV−vis spectroscopy, infrared spectroscopy, and scanning electron microscopy, respectively. The results of quantum chemistry calculations of fluor...

Solvation dynamics of Coumarin 490 in methanol and acetonitrile reverse micelles

Abstract: The solvation dynamics of methanol and acetonitrile in n-heptane /AOT/ methanol and n-heptane/ AOT/acetonitrile reverse micelles have been investigated by picosecond time resolved emission spectroscopy using Coumarin 490 (C-490) as a probe. We have observed a substantially slower dynamics (order of a few ns) of methanol and acetonitrile reverse micelles compared to pure solvents. The solvation time is dependent on the w value (w = [polar solvent]/[AOT]) in the case of methanol reverse micelles but there is little w dependence in the case of acetonitrile reverse micelles. The different w dependence of solvation dynamics of methanol and acetonitrile reverse micelles is explained on the basis of the presence and absence of a hydrogen bonding network.

Prediction of electrode potentials of some quinone derivatives in acetonitrile

Abstract: The electrode potentials of some quinone derivatives in acetonitrile have been calculated. The calculations are carried out at the SCF level with the inclusion of entropic and thermochemical corrections to yield free energies of redox reactions. The Polarizable Continuum Model (PCM) is used to describe the solvent. The model produces electrode potential values in a relatively good agreement with experimental data. The results show that the method is likely to be useful in the prediction of electrode potentials of organic molecules in different aprotic solvents.

Effect of Solvent Polarity on the Fluorescence Quenching of Biologically Active 5BAMC by Aniline in Binary Solvent Mixtures

Abstract: The fluorescence quenching of 5, 6-benzo-4-azidomethyl coumarin (5BAMC) by aniline have been carried in different solvent mixtures of benzene (BN) and acetonitrile (AN) at room temperature by steady state fluorescence measurements. The quenching is found to be appreciable and a positive deviation from linearity was observed in the Stern-Volmer plot for the fluorophore in all the solvent mixtures. Various parameters for the quenching process have been determined using the extended S-V equation and have been found to be dependent on the solvent polarity. Further, with the use of finite sink approximation model, it is concluded that the bimolecular reactions quenching reactions are diffusion limited, and the distance parameter R′ and mutual diffusion coefficient D are estimated independently.