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- W2022342895 abstract "Raman spectra of vapor mixtures ZrCl4-POCl3, HfCl4-POCl3, ZrCl4-AlCl3 and HfCl4-AlCl3 are obtained in the temperature range 300–500°C. The spectra consist of superposition of bands due to the component gases plus a few new bands which were attributed to vapor complexation. A comparison of the spectra features in the systems MCl4-POCl3 (M = Zr or Hf) with the spectra of the 1 : 1 liquid and glass MCl4 · POCl3 (M = Zr or Hf) with the spectra of the 1 : 1 liquid and glass MCl4 · POCl3 indicate that the vapor complexes also have a 1 : 1 stoichiometry and that complexing occurs through oxygen bridging. The strongest Raman bands for the Zr-O-P and the Hf-O-P complex are at 508 and 512 cm−1, respectively. For the MCl4-AlCl3 systems two possible vapor complexes, MAl2Cl10 and MAlCl7, are considered. Temperature dependence measurements of the Raman spectra of the ZrCl4-AlCl3 systems indicate that the predominant vapor complex is probably 1 : 1 and permit the estimation of the enthalpy of the reaction: ZrCl4(g) + 12Al2Cl6(g) = ZrAlCl7(g); ΔH0 = −34.9 ± 2.5 kJ mol−1. The strongest Raman bands for the Zr-Cl-Al and the Hf-Cl-Al complex are at 401 and 391 cm−1, respectively, and is assigned to M-Cl (terminal) stretching." @default.
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- W2022342895 date "1986-01-01" @default.
- W2022342895 modified "2023-10-16" @default.
- W2022342895 title "Raman spectroscopic studies of vapor complexation in the MCl4-POCl3 and MCl4-AlCl3 (M = Zr or Hf) binary systems" @default.
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- W2022342895 doi "https://doi.org/10.1016/s0277-5387(00)83500-7" @default.
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