IR data

Using this strategy, constmction of multilayer films of - O. fim thickness by self-assembly of methyl 23-ttichlorosilyltticosanoate (MTST) on siUcon substrates has been demonstrated (Fig. 9) (165). The linear relationship between the film thickness and the layer number showed a slope of 3.5 nm /layer. Filipsometry data, absorbance intensities, and dichroic ratios for the multilayers all suggest that the samples were composed of distinct monolayers. However, ir data indicated that there maybe more tilting or disordering of the alkyl chains in the seven-layer sample than for the monolayer samples. 

Similarly, 3- and 4-hydroxycinnolines and their derivatives exist predominantly in the 0X0 forms (7) and (8), as supported by both pjSTa values and UV spectral data. The oxo forms for 3-hydroxycinnolines have been further supported by IR data <76MI21200>. Phthalazin-4-ones exist in the oxo form and phthalic hydrazide in the monohydroxymonooxo... 

Extensive UV absorption data (as well as NMR and IR data) have been reported for a large number of 2,1-benzisoxazolium salts. The salts show three absorption maxima at 270-273, 280 and 335-338 nm (73DIS(B)1434, 71JOC1543). 

On the basis of IR data the basicity of some diaziridines was discussed. The basicity of the spirodiaziridines (36) increased on alkylation of one nitrogen from pAT = 4.6 (R = H) to pK = 6.4 (R = Bu"). pK values of diaziridines alkylated on both nitrogens were always below 5.0 (69IZV1847). 

IR data are of no importance for the characterization and structural elucidation of azepines. NMR Spectra and Conformational Studies... 

Table 1.9 summarizes structural data for a number of ruthenium nitrosyl complexes, along with IR data [121, 122],... 

Table 1.9 Ruthenium nitrosyl complexes structural and IR data ...

The most versatile route involves the synthesis of the MeCN complex the weakly bound nitrite is readily replaced by a variety of anions. These generally react in a similar way to the chloride, IR data for these and their dioxygen adducts are given in Table 2.9 [129]. 

IR data [131] shows a trend to increasing i/(C-0) as the substituents on the phosphine became more electron withdrawing (Table 2.11) so that as the cr-donor power of the phosphine decreases and the 7r-acceptor power increases, the electron density at Ir decreases and electrons are removed from the "-orbital of CO [132]. 

Table 3.22 NMR and IR data [154] for complexes trans-Pt(Pbz3)2HX and frani-[Pt(Pbz3)2HL]+...

Titanium atoms have been cocondensed with CO and N2 matrices (138) and the products identified as TitCOlg and Ti(N2)e. The IR data... 

Another study (200) presented IR data for a number of hydride and deuteride species. Using matrix-isolation spectroscopy in conjunction with a hollow-cathode, sputtering source (the apparatus for which is shown in Fig. 36), the IR-active vibrations of the diatomic hydrides and deuterides of aluminum, copper, and nickel were observed. The vibra-... 

The fitting achieved by the scale for both ir data sets is approximately a factor of two better than that obtained for any other parameters. While the fitting with is slightly outside of the/<. 10 criterion, it seems probable that... 

The notion was also tested that the ir data for benzenes should be used to generate parameters which would be more suitable to 14 reactions of Table VIII than the values obtained from the 17 basis sets (Table V). Such a procedure, however, was found to give poorer fits than that achieved by the Table V parameter set. This result suggests again the incursion of the experimental difficulties in the ir data noted above. It is clear, however, that the independent test provided by the ir results does offer further support for a unique scale. 

The complex (Ph3P)2Pt(SiCl2)2 was monomeric in benzene, and reacted with diphenylacetylene to give a 1 1 adduct (also monomeric in benzene). On this basis, together with IR data, structure (XII) rather than (XIII) was preferred for the SiX2 compounds, and the adduct was formulated as (XIV). 

In agreement with the LEED and IR data, the peak and shoulders correspond to the multiple and single bound (on top and in the valleys adsorbed) CO. 

In agreement with IR data, only the single bound CO is present in this strongly diluted ( = 10% Pdgu f) alloys. 

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. 

B. Walczak, B. van den Bogaert and D.L. Massart, Application of wavelet packet transform in pattern recognition of near-IR data. Anal. Chem., 68 (1996) 1742-1747. 

With our optimized conditions in hand, the reaction was performed in a 100 litter flask on several occasions with good success. Even though we had React-IR data (p. 63, Figure 2.3) for monitoring the catalyst formation, the React-IR data did not provide additional information on the active catalyst. Therefore, a portion of activated catalyst solution was tested prior to addition of a whole catalyst solution to the real batch, to ensure success of the reaction. At the end of the reaction, the crude mixture was passed through a short silica gel pad to remove Mo and the mixture was used for the next reaction without further purification. 

When we activated the catalyst system on a large scale, we were unsure of whether the reaction would proceed. The only data for the catalyst activation available to us was in situ IR (React-IR) as shown in Figure 2.3. During activation of the catalyst, a single vibration frequency (-1980 cm"1) of carbon monoxides in Mo(CO)(s became five different frequencies of carbon monoxide in the catalyst solution. This IR data provided us some relief from the risk of running the large scale reaction but did not provide any clues on the structure of the true catalyst. 

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