Metallocene halides. Part II. The low frequency infrared and Raman spectra of di-π-cyclopentadienyldihalogeno-titanium(IV), -zirconium(IV), and -hafnium(IV)

Abstract
The low frequency i.r. and Raman spectra of the compounds (π-C5H5)2MX2(M = Ti, Zr, and Hf; X = F, Cl, Br, and I) have been studied in the solid state and in solution. The metal–halogen [for the chlorides and (π-C5H5)TiX2(X = Br or I), there is uncertainty] stretching vibrations are assigned as follows [M, X, νsym(cm.–1), νasym(cm.–1)(i.r., soln.) Ti, F, 579, 550; Zr, F, 560, 545; Zr, Br, 223, 212; Zr, I, 190(?), 178; Hf, F, 562, 536; Hf, Br, 208 1 97; and Hf, I, 170, 153].

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