Infrared Perkin-Elmer

Figures 2 through 9 are infrared spectra of fractions collected from partition columns, gas chromatography, thin-layer chromatography, or a combination of these separation techniques. Figure 10 is the infrared spectrum of a compound isolated by gas chromatography after hydrolysis of a pyrethrum concentrate. In this case the compound is a long-chain ester. All the infrared spectra were made with a Perkin-Elmer Model 221 instrument. The following operating parameters were used. A liquid demountable cell with a 0.01-mm path length was employed.

Infrared spectra were recorded on a Perkin-Elmer Model 521 spectrophotometer and 10-15% (w/v) polymer solutions were used. A pair of Perkin-Elmer solution cells with sodium chloride windows were used to hold the sample solution and reference solvent. 

The isocyanate concentration during curing of polyurethane paints has been quantified by tracing the infrared absorption of the isocyanate group (2272 cm- ) with a Perkin Elmer 983 spectrophotometer. 

Fourier-transform infrared (IR) spectra (resolution 2 cm- ) were recorded with a Perkin Elmer 1750 instrument in a quartz cell connected to grease-free evacuation and gas manipulation lines. The self-supporting disk technique was used. Before recording the spectra, the samples were treated with O2 at 450°C (Ih), then cooled down to r.t. before evacuating the O2. The sample was then evacuated at 400°C. Evacuation at higher temperatures lead to a drastic cut off of IR trasparency. All reactants were purified prior to the adsorption experiments. Due to the better resolution of the spectra, only results for Sb V=1.0 are reported here, however the IR data for Sb V=3.0 were not significantly different. 

Infrared Spectra. Limited effort has been made to identify the major chemical group components of the extract. Infrared spectra (Perkin-Elmer 913) of the evaporated extracts from two lakes were similar in having peaks at the following frequencies 3,000-3,100, 3,200-3,600, 1,500-1,650, and 1,690-1,760 cm-l. These preliminary data would suggest the presence of polyphenolic compounds in the extract which may be related to humic materials occurring in nature (16). 

NMR spectra were recorded on a JEOL FX90Q (90 MHz) spectrometer. chemical shifts are reported relative to an internal standard of CHCI3 in CDCI3, while 13c chemical shifts are reported relative to the CDCI3 used as solvent. Infrared spectra were recorded on an IBM IR32 FTIR or a Perkin-Elmer 1330 IR spectrophotometer. Uv-visible spectra were obtained using a Varian DMS90 spectrophotometer. 

In order to follow progress of elimination, reactions were also performed on thin films in a special sealed glass cell which permitted in situ monitoring of the electronic or infrared spectra at room temperature (23°C). Typically, the infrared or electronic spectrum of the pristine precursor polymer film was obtained and then bromide vapor was introduced into the reaction vessel. In situ FTIR spectra in the 250-4000 cm-- - region were recorded every 90 sec with a Digilab Model FTS-14 spectrometer and optical absorption spectra in the 185-3200 nm (0.39-6.70 eV) range were recorded every 15 min with a Perkin-Elmer Model Lambda 9 UV-vis-NIR spectrophotometer. The reactions were continued until no visible changes were detected in the spectra. 

Infrared spectra were recorded on a Perkin Elmer model 680 spectrophotometer as mulls in nujol or fluorolube. The magnetic susceptibility of the copper complexes was measured from 4.2 to 300 K by the Faraday method . X-ray photoelectron spectroscopy (XPS) was performed with a Perkin Elmer hemispherical spectrometer. 

Infrared Red Studies. Infrared spectra were recorded in a Perkin Elmer PE-M330 infrared spectrometer. IR studies of the metal films using either KBr pellets or Fluorolube yielded bands at 2960(s), 2580(m), 1750(s), I635(m), and 570(w) cm-1. 

The infrared absorption spectrum of miconazole nitrate was obtained in a KBr pellet using a Perkin-Elmer infrared spectrophotometer. The IR spectrum is shown in Fig. 4, where the principal peaks were observed at 3140, 3070, 2995, 2920, 1566, 1525, 1445, 1385, 1310, 1070, and 710 cm-1. Assignments for the major infrared absorption band are provided in Table 2. Clarke reported principal peaks at 1085, 1319, 827, 1302, 1038, and 812 cm-1 (miconazole nitrate, KBr disc) [2]. 

The infrared absorption spectrum of (/))-penicillamine was obtained using a Perkin-Elmer infrared spectrophotometer. The spectrum shown in Fig. 2 was obtained with... 

The infrared (IR) absorption spectrum of primaquine diphosphate was obtained as KBr disc using a Perkin-Elmer infrared spectrometer. The infrared spectrum is shown in Fig. 4 and the principal peaks are at 2946, 1612, 1469, 1430, 1384, 1200, 1050, 956, 815, and 760 cm-1. The assignments of the infrared absorption bands of primaquine diphosphate are shown in Table 2. Clarke reported the following principal peaks at 1611, 1595, 815, 1230, 1572, and 1170 cm-1 (KBr disk) [2],... 

Chemicals used in this study were obtained from Aldrich Chemical Company. 1H NMR spectra were obtained on a Varian EM-360, 13C NMR spectra were obtained on a JEOL-FX-60Q or a GE QE-300. An Analect FX-6200 FT-IR spectrometer was used for infrared spectroscopy and a Hewlett-Packard Model 5980 with a model 5970 mass-selective detector was used for GC-MS. TGA measurements were performed on a Perkin-Elmer TGA-7 instrument. HPLC measurements were obtained using a Waters Instrument. 

Products in the reaction mixture were analyzed by infrared and nmr spectroscopy. IR spectra were obtained on a Perkin-Elmer 521 infrared spectrophotometer. The reaction mixture was first suction filtered through a fine porosity glass frit inside a glove box (Vacuum Atmosphere HE-43-2) under an argon atmosphere, and was placed in NaCl cells (International Crystals, Inc.) of path length 0.1 or 0.5 cm with Teflon stoppers. H nmr spectra... 

Figure 2. Infrared Spectrum of Aspirin (U.S.P. Reference Standard) KBr pellet. Instrument Perkin-Elmer Model 621...

The infrared spectrum of bromocriptine mesilate in a KBr pellet is given in fig. 1. It was recorded on a Perkin Elmer 257 infrared spectrophotometer. 

The infrared spectrum of calcitriol is shown in Figure 1 (1). The spectrum was recorded on a Perkin-Elmer Model 283 Grating Infrared Spectrophotometer and was measured in a KBr pellet which contained 1 mg of calcitriol in 300 mg of KBr. 

The infrared spectrum of griseofulvln, obtained as a mineral oil mull, was run on a Perkin-Elmer Model 180 grating IR spectrophotometer. Important absorption assignments are given in Table V. The spectrum is given in Figure 6. 

Figure 6 shows the infrared spectrum of halcinonide run as a potassium bromide pellet, using a Perkin-Elmer Model 621 infrared spectrometer. Below are the interpretations of various absorbances.19... 

The infrared spectrum of nalidixic acid in a KBr pellet is presented in Figure 3. The spectrum was obtained on a Perkin-Elmer Infrared Spectrophotometer Model 21. It agrees with the spectrum presented by Salim and Shupe.(2)... 

Infrared spectra were obtained with a Perkin-Elmer 1800 and a Nicolet Magna-IR 750 FTIR spectrophotometer, and the absorption frequencies are reported in wave numbers (cm4). NMR spectra were obtained with BZH-300 and CA-F-300 Bruker FTNMR 300 MHz spectrometers. Chloroform-d was used as solvent, and all chemical shifts are reported in parts per million downfield (positive) of the standard. H-NMR and 13C-NMR chemical shifts are reported relative to internal tetramethylsilane, while 19F-NMR chemical shifts are reported relative to internal fluorotrichloromethane, Rf values were obtained from silica gel thin-layer chromatography developed with a mixture of 1.5 mL methylene chloride and three drops of acetone. The number of hydrate water molecules was calculated from the integration of H-NMR spectra. 

The 11 nm-sized Ti02 were crystallized using either hydrothermal or thermal methods from 100 nm, amorphous gel spheres. The Ti02 crystal and agglomerate sizes were determined by X-ray diffraction (Philip 1080) and transmission electron microscopy (JEOL JEM 2010), respectively. The surface area and chemistry of the nanostructured Ti02 were analyzed by nitrogen physisorption (Coulter SA 3100) and Fourier transform infrared spectroscopy (FTIR, Perkin-Elmer GX 2000). Metal catalyst was deposited by incipient... 

To record the infrared spectra, samples of the parent kaolinite and the three hydrates were dispersed in a fluorinated hydrocarbon. The mulls were squeezed between calcium fluoride plates and the sample was placed directly in the beam of a Perkin-Elmer 683 spectrometer. This mounting technique results in a tendency for the clay layers to align themselves perpendicular to the beam of the spectrometer. Infrared spectra of these materials have been pub-... 

Electronic, Infrared and Mass spectra were obtained using a Hitachi 200-20 spectrophotometer, a Hitachi EPI-S2 infrared spectrophotometer and a Hitachi RMU-6E mass spectrometer, respectively. NMR spectra were obtained using a Hitachi-Perkin-Elmer, model R-2U using carbontetrachloride as the solvent. 

The PPE films for the infrared spectra measurement were formed on NaCl or KC1 crystals at three different discharge frequencies. For the discharge frequencies of 1 KHz and 100 KHz, the two films were polymerized at 0.5 torr, 20 cm3STP/min and 10 watts. Another one was prepared at 13.56 MHz, 2.0 torr, 20 cm3STP/min and 50 watts. Infrared spectra were recorded with a Perkin-Elmer Model 137 Spectrometer. 

Infrared spectra were recorded on a Perkin Elmer Model 567 Spectrophotometer. Ultraviolet spectra were obtained on a Cary 1756 Spectrophotometer. Gas chromatograms were recorded on a Tracor Model 220 with electron capture detector. High pressure liquid chromatography studies were conducted with a Waters Model ALC-200 with ultraviolet and refractive index detectors. 

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