Oxide melts infrared spectra

The explosive coke is a brown intractable powder, apparently polymeric, melting about 360° and containing nitro groups as indicated by its infrared spectrum. Since similar results were obtained from heating TNT in an inert atm and with exposure to air, oxidation must have occurred at the expense of nitro groups, which would correspondingly be converted to azo or azoxy compds or to an anthranil, by inter- and intramolecular reaction, respectively, with the... 

The nature of the species that are formed at high oxide to niobium ratios are more uncertain, but it seems likely that the first of them has a niobium-oxygen ratio of 1/2 (i.e. [Nb02Fi" ] ). Bands in the Raman spectrum of the melt at 878 and 815cm and in the infrared spectrum of the solidified melt at 879 and 809 cm are ascribed to the stretching vibrations of the Nb02 entity. The vibration spectra (Raman of the melt and infrared of the solidified melt) are consistent with the formation of Nb02F4 ions of C2v symmetry. 

The pure crystalline bis(9-borabicyclo[3.3.1]nonane) melts at 148°15 and has a b.p. at 12 torr of 195°.16 The compound, in contrast to the simple tetraalkyldiboranes, has a definite structure. Its infrared spectrum shows vBH2b at 1567 cm.-1. The completely pure compound is stable at room temperature even with air access for long periods. However, storage and handling of the compound should be carried out in an inert-gas atmosphere. Water and alcohols react with it even at room temperature, with evolution of hydrogen. Alcoholysis is well suited for determination of the B—H content. The quantitative BC determination proceeds very well by a variant of the trimethyl-amine N-oxide oxidation method.13... 

All oxide glasses contain chemically bound water, usually in the form of hydroxyl. The effects of water content on the infrared spectrum, glass transformation temperature, and melt viscosity are very important in a number of commercial applications. Variations in reported values for Tg of glasses of supposedly the same composition are probably due to variations in water content, which should be specified in any work dealing with the properties which are particularly sensitive to water concentration. 

The Nef reaction was used solving O.lg (0.0005 mol) of 6A in 5 water ethanol) and after stirring hour, the pH of the solution was adjusted to 7 with 50% HCl. A yellowish white solid (65%) precipitated out and was filtered, dried and recrystallized from ethanol-water, m.p. 140-46 C. 4A obtained from oxidation of 3A (see Scheme 1) melted at 146-48°C. There was no depression in the melting point of a mixture of the two samples. The infrared spectrum was identical to that of 4A prepared by oxidation of 3A. 

When an oxide is added to the melt, complexes with the general formula NbOF " are formed. The most probable value of n is 5, giving rise to a monomeric NbOFj". Infrared spectra of solidified melts support the existence of a niobium-oxygen double bond in this complex. The vibration spectrum is in accord with the band pattern of monomeric NbOFj" with a C41, symmetry. 

Determine the infrared spectium of fhe sublimed camphor and compare it to the spectrum provided in the experiment (use the dry film method in Technique 25, Section 25.4 or other method recommended by your instructor). The spectrum should demonstrate complete oxidation to camphor (absence of OH peak and presence of C=0 peak). There should be sufficienf material for the reduction of camphor to isoborneol. Part B. At the option of fhe instructor, determine the H and NMR spectra of your camphor. Also, at the option of the instructor, determine the melting point (literature mp about 177°C, but it is often lower than this value). Store the camphor in a tightly sealed vial. 

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