Infrared spectral analysis

The top layer was washed with water and ethylene glycol and dried to give 135 g of a yellow oily material that from infrared spectral analysis was identified to be the same triol used to prepare the flexible polyurethane foam. 

Bagby, M. Greener, E. H. (1985). Infrared spectral analysis of EBA-hexyl vanillate-ZnO cement. Dental Materials, 1, 86-8. 

A representative sample of many of the polyimide films that were produced were subjected to thermo-mechanical analysis (TMA), torsional braid analysis (TBA), thermal gravimetric analysis (TGA), infrared spectral analysis and weight loss on prolonged heating (e.g. isothermal studies), TABLE II. The softening temperature as measured by TMA and TBA are in general... 

Fraction D. After removing the nonaqueous solvents from this fraction, a thin, light yellow oil separated. The yield in Table II is the weight of this oil. Infrared spectral analysis indicated a fatty alcohol ester of phthalic acid. 

West, P. A., Bostrom, M. P., Torzilli, P. A. and Camacho, N. P. (2004) Fourier transform infrared spectral analysis of degenerative cartilage an infrared fiber optic probe and imaging study. Appl. Spectrosc. 58, 376-81. 

Polymorphism is customarily monitored by melting point or infrared spectral analysis. However, other methods, such as X-ray diffraction, thermal analytical, and solid-state Raman spectroscopy, also can be used. It is expected that the sponsor will conduct a diligent search by evaluating the drug substance recrystallized from various solvents with different properties. Either the basis for concluding that only one crystalline form exists, or comparative information regarding the respective solubilities, dissolution rates, and physical/chemical stability of each crystalline form should be provided. 

The rearrangements could often be followed by the change in the ultraviolet absorption spectra (as in the case of the allyloxypyridine-1-oxides) or through quantitative analysis by paper chromatography of the product mixture (as in the case of the pyrimidine derivatives) or by gas liquid chromatography and infrared spectral analysis (as in the case of the quinoline derivatives). 

Further support for this observation was secured from a study of the rearrangement of the two ethers 3-allyl-4-methallyloxyquinoline and 4-allyloxy-3-methallylquinoline. The quinolone product obtained in quantitative yields in both cases was found by infrared spectral analysis to be a 1 1 mixture of the two possible structures (3 and 4). 

Inherent viscosities of the polymer (Table) show that 10 and that polymerization at higher temperatures reduces the molecular weight (Figure 5). Infrared spectral analysis of the polyethylenes obtained in the Table showed no H(R)C=CR2 groups that would result from a-olefin formation then incorporation into growing polymer then chain termination via... 

Recall that photolysis of 2-naphthyl azide in the presence of diethylamine gives l-amino-2-diethylaminonaphthalene but that irradiation of 1-naphthyl azide under these conditions gives only 1-aminonaphthalene. However, irradiation of either 1- or 2-naphthyl azide in a low-temperature matrix was shown to give azirines by infrared spectral analysis. Since azirines are the likely precursors to substituted diamines, these findings pose a dilemma that was resolved by application of time-resolved spectroscopic methods. 

Optical remote sensing (ORS) technologies, employing infrared spectral analysis techniques, have been utilized in the development of chemical agent standoff detection technologies. Within the ORS technologies, there are two types of remote sensing systems passive and active (laser). The section below only looks at the passive system, which employs a Fourier Transform Infrared (FTIR) spectrometer. 

The xanthate precursor route is another method to prepare PPV. The PPV synthesized by the XPR is more amorphous that PPV synthesized via the SPR. The more amorphous PPV has been reported to exhibit better photoluminescence efficiency. Evolved gas infrared spectral analysis demonstrates loss of the xanthate group in the form of carbonyl sulphide (COS) and thiol (CH3CH2SH) byproducts. The loss of COS occurs first as the precursor is heated to -ISO ° C. The three-dimensional temperature-... 

Martelo-Vidal, M. J., Dommguez-Agis, R, and Vazquez, M. 2013. Ultraviolet/visible/ near-infrared spectral analysis and chemometric tools for the discrimination of wines between subzones inside a controlled designation of origin A case study of Rias Baixas. Aust. J. Grape Wine R. 19 62-67. 

Abdel-Fattah, A.A., Ebraheem, S., Ali, Z.Y., Abdel-Rehim, F. Ultraviolet and infrared spectral analysis of inadiated polyethylene films emrelation and possible application for laige-dose radiation dosimetry. J. AppL Polym. Sei. 67, 1837-1851 (1998)... 

At the instructor s option, determine the proton NMR spectrum of your essential oil. NMR provides a nice confirmation of your sfrucfure. In keeping wifh fhe spirit of green chemistry, deuterated acetone can be used as an alternative solvent to deu-terated chloroform. You can use deuterafed acetone to remove the essential oil from fhe cenfrifuge tube and directly transfer fhe solution fo an NMR tube. Once the NMR has been determined, you can transfer some of fhe NMR sample fo a salf plafe for infrared spectral analysis. Assign the peaks in the spectrum to the structure of your essential oil. 

Renier and co-workers [54] give details of a method for the infrared spectral analysis of Methacrol 2138 (polydiisopropylaminoethylmethacrylate-co-decylmethacrylate) and Santowhite (4,4 butylidene bis (6- e butyl-w-cresol) in extracts of polyethyl urethane urea (PEUU) biomedical implantable material. 

The ATR accessory has revolutionized the ease of infrared spectral analysis of solids. For example, it is often unnecessary to make use of KBr pellets and Nujol mulls. The spectrum obtained with an ATR FT-IR is nearly identical to that obtained with an FT-IR operating in the transmittance mode. One may observe some differences in the relative intensities of the peaks, but the peak position in wavenumbers is identical in both modes. ATR FT-IR does not require a clear sample that allows light to pass through the sample, such as is common with transmittance instruments. There are some limitations with a diamond ATR instrument. Some materials such as coatings on metal and very dark samples do not analyze satisfactorily, but there are few other limitations. 

Y. Hayashi, Organic Chemistry and Infrared Spectral Analysis, Kagaku (Kyoto) 15, 212-221, 1960. 9 references. 

The structure of polymer [20] was confirmed by infrared spectral analysis (99). Spectral evidence indicated that more than 90% of the monomer units were consumed via cyclopolymerization. However, polymerization in bulk or emulsion yielded cross-linked insoluble product only. 

Mincu, I., Hillebrand, M., AUouche, A., Cossu, M., Verlaque, R, Aycard, J.R, and Pourcin, J., Photolysis of the dichlorocyclobutenedione in rare gas at 10 K. Infrared spectral analysis and ab initio calculations of vibrational frequencies. First identification of two new species (dichloro-substituted bisketene and dichloropropadienone). Kinetics and reaction mechanism, /. Phys. Chem., 100, 16045, 1996. 

Arnaudov, M.G., B.B. Ivanova, and L.S. Prangova. 2003. Linear-dicroic infrared spectral analysis on the stereo structure of 4 -cyanophenylthiolbenzoate. J. Mol. Struct. 661-662 219-226. 

Arnaudov, M.G., B.B. Ivanova, St.T. Todorov, and S.Io. Zareva. 2006. Reducing-difference infrared spectral analysis of cis- and trans-configurated lactams. Spectrochim. Acta 63A 491-500. 

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