No abstract

The study of colored organometallic complexes by dispersive Raman spectroscopy has been limited due to fluorescence or photodecomposition caused by the visible laser used as the excitation source. As a solution to this problem, IT-Raman spectroscopy with a near-infrared laser source has been useful in lowering fluorescence or photolysis in these samples. To investigate the utility of this technique, we have obtained and assigned the FT-Raman spectra of a series of arene chromium tricarbonyl complexes and of cyclopentadienyl manganese tricarbonyl. Some bands previously unobserved by dispersive Raman spectroscopy were seen, including a band assigned to a I3CO satellite in the spectrum of methylbenzoate chromium tricarbonyl. In addition, FT-Raman data for bovine serum albumin (BSA) and Protein-A are presented.

The IR, micro-Raman and Fourier transform (FT) Raman spectra of 3-O-(3-hydroxypropyl)-l7~~tradiol and the two (a and 8) diastereomers, produced by coordination of a Cr(CO), moiety to the arene A ring of the steroid, are presented. The three compounds exhibit spectra typical of arene hormonal steroids and the a-and /l-diastereomers can be readily distinguished from one another, especially by their FT-Raman spectra in the CO stretching region which, unlike the corresponding micro-Raman data, are not significantly masked by the presence of strong fluorescence backgrounds. This distinction is important since the adiastereomer is a useful IR estrogen-receptor marker, whereas the b-diastereomer is not.