Methanol infrared decomposition

In this study, we extend the range of inorganic materials produced from polymeric precursors to include copper composites. Soluble complexes between poly(2-vinylpyridine) (P2VPy) and cupric chloride were prepared in a mixed solvent of 95% methanol 5% water. Pyrolysis of the isolated complexes results in the formation of carbonaceous composites of copper. The decomposition mechanism of the complexes was studied by optical, infrared, x-ray photoelectron and pyrolysis mass spectroscopy as well as thermogravimetric analysis and magnetic susceptibility measurements. 

I2]. The substantial solubilities of these compounds in chloroform and other less polar organic solvents are in agreement with their formulation as nonelectrolytes. In methanol at 25° C., the molar conductivities of 166 and 167 ohm-1 for [Ni-(NH2CH2CH2S-CH3)2I2] and [Ni(NH2CH2CH2S-CH2C6H5)2I2], respectively, are characteristic of di-univalent electrolytes in this solvent, indicating almost complete solvolysis of the coordinated iodide ions in this relatively polar solvent. Decomposition of these complexes was observed upon dissolving in water. Visible and near-infrared spectra results are also consistent with structure VI. 

Calvert and Hanst88 using infrared analysis, have also re-investigated the photooxidation of acetaldehyde at 20°C. using 3130 A. radiation. Acetaldehyde pressures were chiefly about 42.5 nun., but the oxygen pressure was varied from 0 to 745 mm. Analyses were made for carbon monoxide, carbon dioxide, formic acid, methanol, acetic acid, peracetic acid, acetyl peroxide, methyl hydroperoxide, and unreacted acetaldehyde (Table X). Chains were short. Although they do not detect methyl hydroperoxide or diacetyl peroxide, the non-observance of a peroxide does not necessarily mean it is not formed. The decomposition of hydroperoxides on the smallest particle of catalyst is remarkably fast. 

Pentacarbonyl(methoxymethylcarbene)chroniiuin(0) is a dull-yellow, crystalline solid mp 34°. It slowly decomposes in the solid state at room temperature in air, but may be stored at 5° for a few days before appreciable decomposition is observed. It is soluble in aliphatic hydrocarbons such as n-pentane, n-hexane, n-heptane, and other common laboratory solvents such as benzene, 1,4-dioxane, tetrahydrofuran, chloroform, dichloromethane, and methanol, and is slightly soluble in ethanol. The infrared spectrum (cyclohexane solution) has v(CO) bands at 2065, 1985, 1965, and 1950 cm-1. The H nmr spectrum in chloroform-d shows the methoxy proton resonance at t6.15 and the methyl proton resonance at t7.70. Other physical properties are reported in the literature.6,7... 

All the compounds are crystalline solids, and with the exception of RuH(OCOCH3)(CO)[P(C6H5)3]2, can be manipulated in air briefly without decomposition. The platinum complex, ris[Pt(OCOCH3 )2 P(C 6H 5 )3 2] is soluble in chloroform, dichloromethane, and methanol but practically insoluble in benzene and acetone. The other complexes are soluble in chloroform and dichloromethane, moderately soluble in benzene and acetone, and almost insoluble in light alcohols. Analytical and spectroscopic data are given in the following table. Infrared data refer to mulls in Nujol XH nmr data were obtained at 90 MHz using solutions in chloroform-d and are referenced to TMS. 

Anhydrous tetraphenylarsonium cyanate is a white solid which is hygroscopic and must be stored in a dry inert atmosphere. It is soluble in ethanol, methanol, and acetonitrile. The compound melts, with decomposition, at ca. 224°. The infrared spectrum, taken as a Nujol mull, exhibits the following bands due to the cyanate fundamental absorptions (incm-i) v(As) at 2140 (s) and d at 622 (s). This spectrum agrees well with a recent spectral study of this compound. Again, as with tetraethylammonium cyanate, Fermi resonance is exhibited in the spectrum of this compound at 1280 (m) and 1192 (m) cm-i. 

One gram samples of the copolymers were suspended in a mixture containing methanol (50 ml), sodium methoxide (10 ml of a 20% solution in methanol), benzene (5 ml) and water (1-5 ml). The mixtures were refluxed with stirring for 6-24 hrs, until the copolymers dissolved. The reaction mixtures were then poured slowly Into a large excess of acidified watei with rapid stirring, to precipitate the products. These were washed with water and dried. Infrared spectra of the copolymers were examined to ensure the complete decomposition of the anhydride groups. 

On the basis of an infrared study of the adsorption and reaction of methanol and dimethyl ether over alkali metal cation exchanged zeolites, we propose a reaction mechanism for the decomposition of methanol over alkali cation exchanged zeolites. Additionally, formaldehyde adsorption is performed on these molecular sieves and attempts will be made to correlate its adsorption structure with the surface reactivity. 

Partide size and structure can have a pronounced effect on the infrared spectra of adsorbed CO. A series of palladium colloids of differing sizes provided the basis for an analyds of this effect. [34, 113, 227] The PVP staUliz palladium colloids were prepared by the reduction of palladium acetate in methanol solution or by the reductive decomposition of bis(dibenzylideneacetone) palladium in the presence of PVP (see Section 6.2). The resulting collmdal palladium partides... 

Commereuc and co-workers [44] examined the products resulting from the photo and thermal decomposition under vacuum of a pre-oxidised isotactic polypropylenes containing a known content of hydroperoxide. In contrast to the case of polyethylene (PE), few products were retained in the polymer matrix. Detailed analysis of the gas phase was performed by GC, Fourier-transform infrared (FT-IR) spectroscopy and MS. About 70% of the hydroperoxides were converted into gaseous products such as acetone, acetic acid and methanol. Mechanisms for their formation were suggested, and the consequences of such a phenomenon for the evaluation of ageing in polypropylene (PP) were discussed. 

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