Infrared Spectra and Structure of Matrix Isolated Thallous Halides

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Abstract
The infrared absorption spectra of the vapor species over thallous fluoride, chloride, bromide, and iodide have been observed in the frequency range 33–4000 cm−1 using the matrix isolation technique. In addition to the absorption frequencies of the TlX monomers, the spectra of the Tl2F2 and Tl2Cl2 dimers have been observed. The absorption bands assigned to the dimer species are consistent with a proposed X–Tl–Tl–X dimer structure. A comparison of the observed to the calculated entropy of Tl2F2 and Tl2Cl2 lends support to the spectral assignments. A qualitative discussion of the bonding for the dimer species is included, to show that the proposed linear symmetrical structure for the Tl2X2 molecules is in agreement with several predictions based upon the qualitative bonding theory.