Vibrational spectra and structure of indium and thallium monocyclopentadienyl complexes

• Published in: Journal of organometallic chemistry Vol. 342; no. 3; pp. 281 - 290
• Main Authors: Garkusha, O.G., Lokshin, B.V., Materikova, R.B., Golubinskaya, L.M., Bregadze, V.I., Kurbakova, A.P.
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 22.03.1988; Elsevier Science
• Subjects: Atomic and molecular physics; Exact sciences and technology; Infrared spectra; Molecular properties and interactions with photons; Molecular spectra; Physics; Vibrational transition; Solid state; Indium Complexes; Temperature; Thallium Complexes; Gaseous state; Hapto complex; Group IIIB metal Complexes; Infrared spectrum; Experimental study; Raman spectrum; Inorganic compound
• ISSN: 0022-328X; 1872-8561
• DOI: 10.1016/0022-328X(88)83001-8

The infrared and Raman spectra of (η5-C5H5In and (η5-C5H5Tl in the mid- and low-frequency regions, at temperatures of 12–300 K for the solids, IR spectra in solid argon matrices in addition to the IR spectrum of CpIn in the gaseous state have been studied. The analysis and subsequent discussion of the spectra of the crystals were in line with D5h symmetry of the Cp-ring, which is consistent with the predominantly ionic character of the metal-ligand bond in the crystalline complexes. Two types of crystal vibrations in the low-frequency region could be distinguished, namely, the translation vibrations of ions sensitive to the metal mass and the librations of the C5H5− anions. A study of the IR spectra of argon matrices and gas (C5v symmetry) has shown that monomeric molecules of the complexes studied have a predominantly covalent metal-ring bond. The values of the out-of-plane ϱ(CH) frequencies show that the polarity of the MCp bond increases upon transition from the isolated molecule to the cystalline polymeric structure.