Infrared spectroscopic data

The predominance of the thione forms of imidazole-2-thiones and benzimidazole-2-thiones has been established using ultraviolet spectroscopy, and for the former compounds this conclusion is supported by infrared spectroscopic data. ... 

Sheinkcr and his co-workers have used ultraviolet and infrared spectroscopic data to show that the imino form of benzenesul-fonamido derivatives of thiazoles and l-thia-3,4-diazoIes is preferred to the amino form by a large factor. In view of this work, the formulation of 2-aryIsulfonamidooxazoles in the amino form on the basis of chemical evidence must be regarded with caution. 

Infrared Spectroscopic Data for Silanols and Their Complexes with Bases... 

T. Fearn and A.M.C. Davies, A comparison of Fourier and wavelet transforms in the processing of near-infrared spectroscopic data part 1. Data compression, J. Near Infrared Spectrosc., 11, 3-15 (2003). 

Infrared spectroscopical data encode a lot of structural information and can be analyzed with the help of computational methods (vide supra) aiding in the identification of the observed species. Sometimes, two different electronic states may lie very close in energy and have similar geometries. In such cases (e.g., the quinonoid radicals to be described in Section II.B.), the predicted differences in the IR spectra are too small to allow an unambiguous assignment of the ground-state multiplicity. In this respect, ESR spectroscopy provides valuable comple-... 

Figure 6 High pressure Fourier transform infrared spectroscopic data. Catalyst precursors (i) Ru3(C0)i2 glacial acetic acid, a) 600 atm CO/Hj, 100°C, b) 760 atm, 180°C (ii) Rug(CO)1j/EtgN in glacial acetic acid, c) 700 atm CO/H2, 200°C.

Figure 7 High pressure Fourier transform infrared spectroscopic data. Catalyst precursor RuaCCO) Rh(C0)2acac, EtgN (Ru Rh Et3N 10 1 10) in glacial acetic acid. Reaction conditions (a) 750 atm, 100°C, (b) 850 atm, 175°C, (c) 880 atm, 200°C...

Table 1 Available structural and infrared spectroscopic data for (L )Pd (ri plexes -02) com-...

Howard has applied his method to high-resolution infrared spectroscopic data obtained by dispersive techniques and to both experimental and simulated Fourier interferograms. The method in the latter application explicitly renders the data as they would be observed by an interferometer having a path difference exceeding the mechanical limits of the instrument used for the observation. Details on both the method and its application constitute Chapters 9 and 10. 

Many complexes involving iron are known, mostly clusters containing iron carbonyl fragments, and reports for some come from the early years of metal cluster chemistry. Perhaps the simplest compound is PbFe(CO)4 , described originally in I960 (59) and later in more detail by Marks in 1978 (60). The structure is unknown although it is postulated to be oligomeric on the basis of infrared spectroscopic data. 

Fearn, T. and Davies, A.M.C., A Comparison of Fourier and Wavelet Transforms in the Processing of Near-Infrared Spectroscopic Data Part 1. Data Compression /. Near Infrared Spectrosc. 2003, 11, 3-15. 

It is also possible to derive structural parameters from infrared spectroscopic data and these are (1) saturated hydrogen to saturated carbon ratio (2) paraffinic character (3) naphthenic character (4) methyl group content and (5) paraffin chain length. 

There are few papers devoted to the detailed analysis of infrared spectra of six-membered sulfur containing ring systems. The majority of infrared spectroscopic data feature in the experimental section of papers concerned with either synthesis or reactivity of the ring system, and in these papers usually only IR bands associated with multiple bond (C=C, C=S, SO, and SO2) stretching modes are assigned. 

Mossbauer and infrared spectroscopic data in the solid state of tributyltin 2-benzoylbenzoate (130a) and triphenyltin 2-benzoylbenzoate (130b) were indicative for... 

More than half a century has elapsed since Linus Pauling discussed his ideas about the fundamental nature and properties of the hydrogen bond in his landmark book [1]. Pauling had based these ideas on the information that was available at the time. He made reference to papers going back as far as 1912 [2] in which the presence of such an interaction was inferred from the weakness of a particular base. In 1920, mention was made of the widespread occurrence of H-bonds [3], in connection with anomalous properties of certain liquids. Most of the information that had accumulated up to 1940 was based on the structures found in crystals, infrared spectroscopic data in solution, and various other physical-chemical data. 

Plasma-polymerized materials differ significantly from those polymerized by conventional methods in their surface properties, and surface tension values do not correspond. This difference may be due to the highly cross-linked nature of plasma polymers or to the incorporation of other entities from the carrier gas. These effects are more important than the intrinsic differences in backbone fiexibility. Wrobel (88) presents ATR-IR (attenuated total reflection infrared) spectroscopic data indicating that silazanes and silanes cross-link more readily than do siloxanes under plasma conditions. Wrobel and his co-workers (89) have also used contact angles to study the thermal decomposition of plasma-polymerized organosilicon polymers. 

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