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在常温下，碘化四丁铵在二氯甲烷溶液里将六氟合钼和六氟合钨还原成ＭＦ－６（Ｍ＝Ｍ０或Ｗ）。它们的红外光谱表明，固体产物是由（Ｃ４Ｈ９）４Ｎ＋和ＭＦ－６组成；电子光谱也指出，在反应中有Ｉ２产生。进一步研究表明，在此条件下Ｍ０Ｆ－６没有被碘化四丁铵继续还原成Ｍ０Ｆ２－６。
Tetrabutylammonium iodide reduces hexafluoro molybdate and hexafluoro tungsten in the methylene chloride solution to MF-6 (M = M0 or W) at room temperature. Their IR spectra indicate that the solid product consists of (C4H9) 4N + and MF-6; the electron spectrum also indicates that I2 is produced during the reaction. Further studies showed that M0F-6 was not reduced to M0F2-6 by tetrabutylammonium iodide under these conditions.