Solid solution Raman spectra

See text. Solid state spectra (Nu)ol or KBr) unless otherwise stated, only strong bands quoted. Relative to CD NO electrode. Petroleum ether solution. iriphos = PhP(CH2CH2PPh2)2- Benzene solution. Toluene solution. Raman spectrum... 

Several liquid systems of PEO, both molten state and solution, have been investigated using vibrational spectroscopy (99). The Raman spectrum of PEO in the melt as well as chloroform and aqueous solutions reveal that the conformations in an aqueous solution retain the tgt conformation that occurs in the crystalline solid. The Raman spectrum of the chloroform solution, however, more closely resembles that of the melt. The conformational distribution was not dedncible dne to uncertainty in band assignments. 

The Raman spectrum of aqueous mer-cury(I) nitrate has, in addition to lines characteristic of the N03 ion, a strong absorption at 171.7 cm which is not found in the spectra of other metal nitrates and is not active in the infrared it is therefore diagnostic of the Hg-Hg stretching vibration since homonuclear diatomic vibrations are Raman active not infrared active. Similar data have subsequently been produced for a number of other compounds in the solid state and in solution. 

According to the Raman spectrum the product contains traces of Se in solid solution which could not be removed by repeated recrystallization. If the oxidation is carried out at -25 °C in a CS2/CH2CI2 mixture and the molar ratio is increased to 1 2.2, PS O is obtained [59] isolated in 10% yield [60]. 

The wavenumbers of the observed bands are identical with those of the spontaneous Raman spectrum of the solution and oxazine solid [27]. The impulsive stimulated Raman transition may initiate coherent vibrations in the electronic excited state. However, there was no sign of the excited-state vibrations superimposed on the ground-state bands in the spectrum of Figure 6.3. 

Andrews and co-workers have recently reported (5) C1- C1 and i 0- 0 isotopic shifts for the infrared spectrum of argon matrix-isolated FCIO2. Tantot (282) has studied in his thesis work the infrared and Raman spectra of the gas, the Raman spectrum of the neat liquid and of HF solutions, and the infrared and Raman spectra of the solid. 

Very few systematic studies have been carried out. Exceptionally, IR spectra of 1,2,5-telluradiazole (10) in solution, in the solid state at room temperature and in the solid state at 10 K have been investigated in the 4000-50 cm region and correlated with the spectrum of 1,2,5-selenadiazole (29a). The Raman spectrum of (10) at room temperature was measured <84SA(A)847>. IR spectra of... 

The reversibility of the [RuO ] - [RuO ] couple cf. 1.4.1.3) and the Raman spectrum of ruthenate in aqueous base suggest that it is tetrahedral, [RuO ] , in solution. Thus, unlike RuO and [RuO ] , ruthenate changes the structure of its anion from that of the trigonal bipyramidal fra 5-[Ru(0H)3(0)3] in the solid potassium and barium salts to tetrahedral [RuO ] in solution. There is evidence from electronic spectra of potassium ruthenate doped into K CrO and K SeO and of barium ruthenate doped into BaSO, BaCrO and BaSeO that, in that these enviromnents at least, the Ru is tetrahedrally coordinated [533]. 

The infrared (IR) spectra of 1,10-phenanthroline, its hydrate and perchlorate in the region 600-2000 cm-1 have been obtained, and the principal features of the spectra interpreted.66 Further studies on the IR spectra of 1,10-phenanthroline,67-69 substituted 1,10-phenanthrolines,70,71 and 1,7-phenanthroline67 have also been reported. The IR spectrum of 4,7-phenanthroline in the region 650-900 cm-1 has been analyzed, and the C—H out-of-plane deformation frequencies were compared with those of phenanthrene and benzo[/]quinoline.72 The IR spectra of salts of 1,10-phenanthroline have been taken, and the NH vibrations determined.28,73 Infrared spectroscopy has been used to detect water associated with 1,10-phenanthroline and some of its derivatives on extraction into nitromethane from aqueous solution.74 The Raman spectrum of 1,10-phenanthroline has been compared with its IR spectrum.75 Recently, the Raman and IR spectra of all ten isomeric phenanthrolines were measured in solution and solid states, and the spectra were fully discussed.76... 

The Cl3+ cation 331 has been identified by its Raman spectrum in the yellow solid which precipitates from solution of Cl2 and CIF in HF-SbF5 at -76°C or formed by treating ClF2+AsF6 with chlorine.772 At room temperature the Cl3+ cation completely... 

In Eq. (10), E nt s(u) and Es(in) are the s=x,y,z components of the internal electric field and the field in the dielectric, respectively, and p u is the Boltzmann density matrix for the set of initial states m. The parameter tmn is a measure of the line-width. While small molecules, N<pure solid show well-defined lattice-vibrational spectra, arising from intermolecular vibrations in the crystal, overlap among the vastly larger number of normal modes for large, polymeric systems, produces broad bands, even in the crystalline state. When the polymeric molecule experiences the molecular interactions operative in aqueous solution, a second feature further broadens the vibrational bands, since the line-width parameters, xmn, Eq. (10), reflect the increased molecular collisional effects in solution, as compared to those in the solid. These general considerations are borne out by experiment. The low-frequency Raman spectrum of the amino acid cystine (94) shows a line at 8.7 cm- -, in the crystalline solid, with a half-width of several cm-- -. In contrast, a careful study of the low frequency Raman spectra of lysozyme (92) shows a broad band (half-width 10 cm- -) at 25 cm- -,... 

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