摘要：

This chapter discusses the analysis of the vibrational spectra of organometallic compounds formed by the metals and hydrocarbons of general formula (CH) n . The unsaturated character of these ring systems implies the presence of highly delocalized electrons called the π electrons. Most of the complexes discussed in this chapter belong to the group of compounds called "π complexes," because the π electrons of the ligands are responsible for bond formation. Ring systems with four, six, seven, and eight CH groups are shown to undergo complex formation with suitable metals. The chapter describes the theoretical considerations in the analysis of vibrational spectra, the principles of molecular spectroscopy, and interpretation of observed spectra. The techniques of infrared and Raman spectroscopy and the general aspects of the analysis of the spectra of π complexes of cyclic systems, C n H n , are also discussed. Experimental results for three-membered rings, four-membered rings, five-membered rings, six-membered rings, seven-membered rings, and eight-membered rings are presented.

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