Phenol-water complex spectrum

Figure 16. Spectrum of the phenol-water complex (a) total ion signal [23] (b) total ion signal [22] (c) ZEKE spectrum [22],...

The infrared (IR) and Raman UV double-resonance spectroscopy of Ph0H(H20) 4 in the OH-stretching vibration region was also smdied . These smdies led to the conclusion that, on the one hand, the symmetric water vj and phenolic OH-stretching (voe) vibrations are downshifted considerably upon the formation of phenol-water complexes (compared with those inherent for bare water and phenol molecules). On the other hand, the antisymmetric V3 vibration of the water molecule is only weakly affected. This results in the appearance of a transparent window region ° in the IR spectrum... 

Figure 4 A 172 MHz broad-band scan (lower trace) and high-resolution spectrum (upper trace) of phenol and water in helium at a stagnation pressure of 100 kPa. Three lines can be recognized in the low-resolution spectrum a doublet consisting of a strong and a weak component of the 6oe

The fluorescence maxima of DMOL and MMOL shift to the short-wave region upon their binding the enzyme 20 nm for DMOL and 100 nm for MMOL, and the fluorescence intensity significantly increases (Fig. 3). The observed changes in the fluorescence emission spectra of DMOL can be explained by the increase in hydrophobicity of microenvironment of the emitter on its binding with the protein. Excitation spectrum of MMOL-luciferase complex (Xem=450 nm) corresponds to the absorbance spectra of MMOL-monoanion. In buffer solution we did not seen the fluorescence spectra of this form due to the fact that in water solution electronically excited MMOL-monoanion exists in form of phenolate-ion only (it is in dianion form). The luciferase microenvironment stabilizes MMOL-monoanion by protecting its phenolic group from dissociation. It shows that in vicinity of MMOL bound to... 

When a frozen solution of PtCl6 and arene in acetic acid (or H2PtCl6 and phenol in water) is irradiated at 77 K, the EPR spectrum is observed (Figure VII.7) containing the characteristic signals of platinum(III) complexes in... 

There is also spectroscopic evidence about the properties of the interior of CA. Thus the spectrum of 4-tert-butylphenol complexed with cyclohexaamylose (C6A) in aqueous solution was superimposable on that of the phenol in dioxane (29), thus indicating the dioxane-like interior of the C6A cavity. Further, the difference spectrum between an aqueous mixture of C7A and N-acetyl tyrosine ethyl ester (ATEe) and ATEe in water alone was essentially identical to that between ATEe in ethyleneglycol and ATEe in water (35), which also underlines the similarity between the CA cavity and the structure of Sephadex. 

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