OH-infrared

Adsorbed species Surface OH infrared Phenol OH infrared [14] Methanol OH Raman v[13]... 

The most important feature of the present model refers to the strong interaction between the incident photons and molecular excitations. Such a model seems to be one more mechanism that explains the appearance of the extended wing in the v(OH) infrared absorption. 

Also the second moment is appreciably temperature dependent in the fibrous gel (Table III) whereas it is practically constant for the other gels (Table II). The proton mobility is thus enhanced by a more regular and close packed distribution of silanols. However the NMR technique of measuring second moment or the observation of the OH infrared bands as such do not allow to distinguish between internal and external OH. 

The Kc values have been obtained by measuring the equilibrium concentration of 4-fluorophenol from the absorbance of the v(OH) infrared band at 3614 cm by means of a Fourier transform infrared (FTIR) spectrometer. The well-known advantages of FTIR spectrometry over dispersive IR spectrometry, used in the early studies [9,10], should provide more accurate absorbance measurements in a larger domain. Consequently, it is easier to adjust the initial concentrations of 4-fluorophenol and base in order to form the complex of 1 1 stoichiometry almost exclusively and avoid the self-association of 4-fluorophenol and the formation of complexes of higher stoichiometry. Examples of such side-effect... 

Rosenbaum N H, Owrutsky J C, Tack L M and Saykaiiy R J 1986 Veiocity moduiation iaser spectroscopy of negative ions the infrared spectrum of hydroxide (OH ) J. Chem. Phys. 84 5308-13... 

Callegari A, Rebstein J, Muenter J S, Jost R and Rizzo T R 1999 The spectroscopy and intramolecular vibrational energy redistribution dynamics of HOCI in the u(OH) = 6 region, probed by infrared-visible double resonance overtone excitation J. Chem. Phys. 111 123-33... 

Figure Bl.5.15 SFG spectrum for the water/air interface at 40 °C using the ssp polarization combination (s-, s- and p-polarized sum-frequency signal, visible input and infrared input beams, respectively). The peaks correspond to OH stretching modes. (After [ ].)...

Anderson D T, Schwartz R L and Todd M W and Lester M I 1998 Infrared spectroscopy and time-resolved dynamics of the ortho-Hj-OH entrance channel complex J. Chem. Phys. 109 3461-73... 

This is a simplified formula for tartar emetic, for X-ray crystal analysis and infrared studies indicate that the. Sb is a part of the antimonate anion [Sb(OH)4] and forms part of a cyclic system. 

Infrared absorption studies have shown that correlates with an absorption at 3 p.m associated with an OH-stretching frequency (20). Indeed, infrared absorption provides a useful tool for evaluation in rapid production quaUty control. Infrared and other studies show that degradation is caused by proton inclusion in the grown quartz. 

The individuality of received complexes was proved by X-ray phase analysis (DRON-3.0). Preparative investigation of complexes was made. Infrared spectrums of complexes were made (Uh-20, KBr). It was proved that in the III complex hydroxylamine is coordinated with Fe (II) by oxygen in the form of n-oxyde-o-NH -and in IV - by nitrogen in the form of NH OH. The composition of IV hasn t been proved in dry ruminant because of surplus age of reagent. Tire composition of III responds to formula of [Fe(NH,OH) Cl,]. 

Determination of tire CaO exeess is earned out using ehemieal analyses whieh are time and reaetive eonsuming. Nevertheless, Fourier transform infrared (FT-IR) speetroseopie analysis of this kind of material shows a eommon vibration band at 3640 em whieh belongs to 0-H group, due to Ca(OH), generated during the neutralization reaetion. 

We discuss the rotational dynamics of water molecules in terms of the time correlation functions, Ciit) = (P [cos 0 (it)]) (/ = 1, 2), where Pi is the /th Legendre polynomial, cos 0 (it) = U (0) U (it), u [, Is a unit vector along the water dipole (HOH bisector), and U2 is a unit vector along an OH bond. Infrared spectroscopy probes Ci(it), and deuterium NMR probes According to the Debye model (Brownian rotational motion), both... 

The infrared spectra of alcohols change markedly with increasing concentration. For example, at very low concentration, the infrared spectrum of te/t-butyl alcohol in carbon tetrachloride contains a single sharp band at approximately 3600 cm corresponding to the OH stretching motion. As the alcohol s concentration increases (by adding more alcohol to the sample), a second broad OH stretch band grows in at approximately 3400 cm and eventually replaces the other band. 

Hydroxyisoquinolines have been considered to exist as such rather than as 30 on the basis of chemical evidence, and, indeed, the infrared spectrum of this compound was reported to show a v OH band at 2.93/j(, (3413 cm ). These results have been questioned, the iso-... 

Structures 74-76 represent the predominant tautomeric forms of each of the hydroxyazines indicated in chloroform and in the solid state since both C—0 and KH absorption bands occur in their infrared spectra, but OH bands are absent. °... 

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