Fourier transform infrared FT-IR spectra

Prior to solving the structure for SSZ-31, the catalytic conversion of hydrocarbons provided information about the pore structure such as the constraint index that was determined to be between 0.9 and 1.0 (45, 46). Additionally, the conversion of m-xylene over SSZ-31 resulted in a para/ortho selectivity of <1 consistent with a ID channel-type zeolite (47). The acidic NCL-1 has also been found to catalyze the Fries rearrangement of phenyl acetate (48). The nature of the acid sites has recently been evaluated using pyridine and ammonia adsorption (49). Both Br0nsted and Lewis acid sites are observed where Fourier transform-infrared (FT IR) spectra show the hydroxyl groups associated with the Brpnsted acid sites are at 3628 and 3598 cm-1. The SSZ-31 structure has also been modified with platinum metal and found to be a good reforming catalyst. 

Fourier-transform infrared (FT-IR) spectra (resolution 2 cm" ) were recorded with a Perkin-Elmer 1750 instrument in a cell connected to grease-free evacuation and gas manipulation lines. The self-supporting disk technique was used. The usual pretreatment of the samples was evacuation at 500 C. 

The Fourier-transform infrared (FT-IR) spectra of a-and p-chitm are shown in Fig. 2.15. For a-chitin, the amide I band is split at about 1650 and 1620 cm (Fig. 2.15A), whereas it is a single sharp band at about 1657 cm for 3-chitin (Fig. 2.15B). The amide II band appears at about 1555 and 1559 cm for a- and (3-chitin, respectively. Both polymorphs show strong absorption bands in the 3100-3285 cm region which corresponds to the N-H group. The bands in the 2840-2960 cm region are due to CH, CH2, and CH3 in both chitin polymorphs. The FT-IR vibrational modes of a- and (3-chitins are summarized in Table 2.8. 

Fourier transformed infrared (FT-IR) spectra in transmission were recorded using a Perkin-Elmer 7200 Fourier transform spectrometer and KBr disk technique. 

The Fourier transform-infrared (FT-IR) spectra of two polymorphs, an amorphous form and a methanol solvate of a hydrochloride salt, are shown in Figure 3.24 (see Figure 3.17 for the corresponding DSC thermograms). The spectra can be used to give information on how the molecule is packed in the solid state and which groups of the molecule are in a different environment. As can be seen, the spectrum of the amorphous form of the compound is less well defined and reflects the multitude of molecular environments present in this form of the compound. 

Fourier transform infrared (FT-IR) spectra of the bulk and pol3Tner-immobilized salts were recorded. For this analysis, Bruker IFS 66 FT-IR equipment, pellets in BrK, and a measuring range of 400-1500 cm" were used. X-ray diffraction (XRD) patterns of the solid samples were recorded. The equipment used to this end was a Philips PW-1732, with built-in recorder. The operative conditions were Cu Ka radiation, nickel filter, 30 mA and 40 kV in -... 

Fourier transform infrared (FT-IR) spectra are recorded using a potassium bromide pellet on Infrared Excalibur instrument. UV-Vis spectroscopy is done on a Hewlett-Packard 8453 spectrometer. Co-linear four probe conductivity measurements were performed on the compressed pellets (20 MPa, 10 min) using nanovoltmeter (Keithley 2182A) and programmable current source (Keithley 6220) at room temperature. 

Fourier Transformation Infrared (FT-IR) spectra were recorded using a Peridn-Elmer RX-1 spectrometer with KBr pellet from 4,000 to 400 cm . The H NMR and NMR speetra were acquired at 300 MHz on a Bruker-300 spectrometer with 1% tetra-methylsilane (TMS) as an internal standard. The DSC analysis was carried out with a Qj series TA instruments differential scanning calorimeter using 5-7 mg of the sample crimped in alumininm pans at a heating rate of 10°C/min and nnder nitrogen atmosphere with a flow rate of 40 ml/mia The MW reactions were carried out in a Milestone Ine., laboratory MW system with a frequency of 2,450 MHz and controllable power system (max 1,000 W). A 50 ml (diameter 5 cm) Teflon reaction vessel was used. The temperature and time of the reaction were controlled by pre-programmed Easywave software system. 

Although it will be discussed in more detail later, it is important to note that treatment of oxiranes with aqueous acid (H3O ) results in protonation of the oxygen of the epoxide and ring opening in an ""anti-" or an antarafacial fashion with production of the corresponding diol. Thus, in contrast to the results of permanganate (MnOi) and osmium tetroxide (OsOd oxidation of alkenes, this two-step process (epoxidation followed by aqueous acid hydrolysis) yields the (E)- or trans-diol (Equation 6.20). The H NMR and Fourier transform infrared (FT-IR) spectra for cyclohexene and the (E)- and (Z)-diols are shown in Figure 6.4. 

The Fourier transform infrared (FT-IR) spectra were recorded on a Spectrum One KY (Perkin Elmer, Inc., Waltham, MA) system coupled with a mercury-cadmium-tellurium (MCT) detector. The incident angle of the p-polarized infrared... 

The Fourier transform infrared (FT-IR) spectra Thermogravimetric analysis Thermal degradation isotherms Measurements are typically... 

F-doping may suppress Fe , antisite defects in LiFe(P04)i F3 (where 0 X 0.4), which is demonstrated by Fourier transform infrared (FT-IR) spectra, where a noticeable red shift in the symmetric P-O stretching vibrational mode of the PO polyanion from 970 to 957 cm i is observed. 

Solid-state characterization techniques have been used to verify that the heterogenization procedure did not damage the catalyst. Fourier transform-infrared (FT-IR) spectra give useful indication about the structure of the catalyst heterogenized in the membrane. FT-IR spectra confirmed that the catalyst stmetore is preserved within the polymeric membrane (Fig. 27.1). The infrared spectrum of the catalytic membranes show the characteristic bands of Wio units (595, 803, 895, 958 cm ), as well as those typical of the employed alkylam-monium cation (2870 cm ). 

Fourier-transform infrared (FT-IR) spectra of the fluorescence probes n-(anthroyloxy) stearic acids (where n, the position of the anthroyloxy moiety, = 2, 6, 9, and 12), which presumably locate at different depth within the mixed Triton X-IOO-SDS micelles, indicated a very hydrophobic core, with SDS being in a much more open structure than Triton X-100. Melo et al. used -(9-anthroyloxy) stearic acids (n = 2, 6, 9, and 12) to probe the water content in the vicinity of the anthroate chromophore in micelles of SDS, dodecytrimethylam-monium chloride (DTC), and Triton X-100. The 12-(9-anthroyloxy)stearic acid probe revealed water content for DTC micelles as 19 M (from Xf data) or 1 to 6... 

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