Vibrational spectra, matrix isolation techniqu

The vibrational spectrum of TeF4 has been studied extensively, including matrix-isolation techniques (2). The most dilute matrices reveal absorptions attributable only to the monomeric TeF4 molecule, with C2v symmetry. The more concentrated matrices contain absorptions arising from several dimeric or oligomeric species (2). 

It is always desirable to back up IR absorption spectroscopy with Raman measurements. The different selection rules for the two techniques means that, at least for symmetric species, it is often necessary to have data from both types of measurement to have a full picture of the vibrational spectrum. Raman spectroscopy has been used to study many matrix-isolated species although there are problems regarding intensity and photosensitivity. An excellent review exists on the subject that highlights both the applications and difficulties of the method. A molecule that has been well characterized by both IR and Raman spectroscopy is the matrix-isolated species Mo(C )s(N2) (15). Spectra for (15) are illustrated... 

---