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.

Poly[bis(pyrrol-2-yl)arylenes]: Conducting Polymers from Low Oxidation Potential Monomers Based on Pyrrole via Electropolymerization

Abstract: A series of derivatized bis(pyrrol-2-yl) arylenes, specifically 1,4-bis(pyrrol-2-yl)benzene (1e, BPB), 1,4-bis(pyrrol-2-yl)-2,5-dimethoxybenzene (2e, BPB(OCH3)2), 1,4-bis(pyrrol-2-yl)-2,5-diethoxybenzene (3e, BPB(OC2H5)2), 1,4-bis(pyrrol-2-yl)-2,5-didodecyloxybenzene (4e, BPB(OC12H25)2), 2,6-bis(pyrrol-2-yl)naphthalene (5e, BPN), and 4,4‘-bis(pyrrol-2-yl)biphenyl (6e, BPBP) have been synthesized. Cyclic voltammetry shows these monomers to oxidize at relatively low potentials to form cation radicals. The lowest peak monomer oxidation potential of +0.15 V vs Ag/Ag+ is observed for 2e, lower than that reported for any other pyrrole-based monomer. Electrochemical polymerization from a 0.01 M monomer, 0.1 M tetrabutylammonium perchlorate (TBAP), and acetonitrile solution was carried out using multiple scanning cyclic voltammetry to yield polymers having E1/2 values ranging from −0.1 to +0.1 V. These low oxidation potentials cause the polymers to be quite stable in the electrically conducting form. The electron...

Fe(II) and Fe(III) mononuclear complexes with a pentadentate ligand built on the 1,3-diaminopropane unit. Structures and spectroscopic and electrochemical properties. Reaction with H2O2.

Abstract: Two new iron complexes, [L53FeIICl]PF6 (1·PF6) and [(L53H+)FeIIICl3]PF6 (2·PF6), were synthesized (L53 = N-methyl-N,N‘,N‘-tris(2-pyridylmethyl)propane-1,3-diamine), and their molecular structures were determined by X-ray crystallography. Their behavior in solution was studied by UV−vis spectroscopy and electrochemistry. Upon addition of a base to an acetonitrile solution of 2, the new unsymmetrical dinuclear complex [L53FeIIIOFeIIICl3]+ was detected. Treating 1 with hydrogen peroxide has allowed us to detect the low spin [L53FeIIIOOH]2+. Its spectroscopic properties (UV−vis, EPR and resonance Raman) are similar to those reported for related FeOOH complexes obtained with amine/pyridine ligands. Using stopped-flow absorption spectroscopy, the formation and degradation of [L53FeIIIOOH]2+ has been monitored, and a mechanism is proposed to reproduce the kinetic data.

Cationic iroporphyrins as catalyst in comparative oxidation of hydrocarbons: homogeneous and supported on inorganic matrices systems

Abstract: Cationic ironporphyrins in solution and supported on imidazole propyl gel (IPG) and silica gel (SG) as catalyst in cyclohexane hydroxylation using iodosylarene as oxygen donor were studied. FeTM4PyP 5+ , 1 as homogeneous catalyst for cyclohexane hydroxylation, in acetonitrile (CH 3 CN) and ultrasound stirring, gives cyclohexanol (C-ol) yields of 20%. The FeTM2PyP 5+ , 2 as catalyst for cyclohexene oxidation in CH 3 CN and ultrasound stirring is a very efficient system, giving 93% of total yield, with an epoxide:alcohol:ketone selectivity of 77:12:11. The supported systems, 1 -IPG and 1 -SG are particularly efficient in dichloromethane (CH 2 Cl 2 ), giving C-ol yields of 37% and 53%, respectively. These systems consist of polar hemin in isolated sites, which selectively catalyze cyclohexane oxidation in apolar solvent. They represent good cytochrome P-450 model systems. In the same way, the active site of P-450 consists of a polar protohemin in a hydrophobic pocket, promoting selective cyclohexane oxidation. These rigid cationic 1 -IPG, 1 -SG, 2 -IPG, 2 -SG, 3 -IPG and 3 -SG systems can catalyze with very small amounts of ironporphyrins, which correspond to about 30–80 times fewer numbers than the hemin in P-450 catalytic site.