VIBRATIONAL SPECTRA AND STRUCTURE OF ALKOXY AND CHLOROALKOXY DERIVATIVES OF ANTIMONY(V) |
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Authors: | B A Arbuzov V S Vinogradova R R Shagidullin Yu M Mareev I Kh Shakirov |
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Institution: | Butlerov Chemical Institute of the Kazan State University, USSR and Arbuzov Institute of Organic and Physical Chemistry , Kazan, USSR |
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Abstract: | Abstract Vibrational spectra of (CH3O) n SbCl5–n . n = 1: 1; n = 2: 2: n = 3: 3: n = 4: 4; n = 5: 5; have been recorded. According to ir and Raman data 1–5 are centrosymmetrical bridged dimers. The Raman spectra of 3–5 exhibit v(Sb–O) doublets of terminal CH3O at 530–541 and 550–570 cm?1; vibrations of the 4-membered Sb2O2 ring, observed in the 500–517 cm?1 region of the ir spectra of 1–5, are absent. The v(C–O) bands of bridged and terminal CH3O are shifted to higher wave numbers (60 and 31 cm?1, respectively) in the series 1 → 5. The stability of the dimers increases in the series 1 < 2 < 3 < 4 ? 5. At 100–120°C and in CH3CN solutions dimers of 1–3 dissociate to monomers (v(Sb–O) 537–540 cm?1, ir data). The monochloride, 4, is partially dissociated in CH3CN. On solution of the tetrachloride, 1, in benzene a dimer-monomer equilibrium has been observed, with the dimeric form being predominant. |
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