Vibrational spectra phenyl group

The JR spectra of Cp2LnCsCR complexes (R = Ph, t-Bu) exhibit an intensive band v(CsC) at ca. 2050 cm [122, 139, 155, 170]. Only in the case of CpHo(C=CPh)2 the spectrum contains a weak broad band similar to the spectrum of uranium acetylenide complexes [214,215]. In addition to this band the absorbtions at 3075,1483,760 and 690 cm caused by the vibration of phenyl group, are observed. The last two bands characterize a monosubstituted aromatic ring bonded to the acetylene moiety [139, 152, 155]. The t-BuCsC fragment is characterized by the absorbtion at 1360, 1240 and 1200 cm [123, 154, 170]. The intensive absorbtion band at 390 cm is hypothetically attributed to the Ln-C vibration of t -bonded organic substituent [157]. 

The presence of a phenyl group in a compound can be ascertained with a fair degree of certainty from its infrared spectrum. For example, in Figure 22-1 we see the infrared spectra of methylbenzene, and of 1,2- 1,3-, and 1,4-dimethylbenzene. That each spectrum is of a benzene derivative is apparent from certain common features. The two bands near 1600 cm-1 and 1500 cm-1, although of variable intensity, have been correlated with the stretching vibrations of the carbon-carbon bonds of the aromatic ring also, the sharp bands near 3030 cm-1 are characteristic of aromatic C-H bonds. Other bands in the... 

Rotational transitions in the ground vibrational and first three excited states of the torsion around the bond between the acetyl and the phenyl group were observed in the microwave spectrum. 

The cross-section dependence can be exploited to eliminate parts of the molecule from the spectrum. Figure 12D is again AT-phenylmaleimide but with the phenyl ring deuterated. This results in a considerable simplification of the spectrum and all of the modes can be assigned to vibrations of the maleim-ide ring with the phenyl group treated as a point mass. 

The solvent-induced stereochemical behaviour of a bile acid-based biphenyl phosphite has been studied experimentally using circular dichroism (CD) spectroscopy, and theoretically using DFT quantum mechanical methods. " The FTIR, Raman and surface-enhanced Raman scattering (SERS) spectra of phenyl phosphate disodium salt have been recorded and its vibrational wavenumbers, calculated using the Hartree-Fock/6-31G basis set, compared with experimental values. From SERS spectra study, the molecule is adsorbed on the silver surface with the benzene ring in a tilted orientation. The presence of the phenyl ring and the phosphate group vibrations in the SERS spectrum reveal the interactions between the phenyl... 

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