Fluoride Chemistry

Hagemuller, P Inorganic Solid Fluorides Chemistry and Hroperties Academic Press New York 628... 

Tantalum powder is produced by reduction of potassium heptafluoro-tantalate, K2TaF7, dissolved in a molten mixture of alkali halides. The reduction is performed at high temperatures using molten sodium. The process and product performance are very sensitive to the melt composition. There is no doubt that effective process control and development of powders with improved properties require an understanding of the complex fluoride chemistry of the melts. For instance, it is very important to take into account that changes both in the concentration of potassium heptafluorotantalate and in the composition of the background melt (molten alkali halides) can initiate cardinal changes in the complex structure of the melt itself. 

This was the status of the chemistry of S20, F2 at the time of the last review in 1974 (152b) however, over the last 20 years this compound has dominated sulfur oxide fluoride chemistry. The method of preparation by the low-temperature electrolysis of dilute solutions ofKS03F in fluorosulfuric acid has been improved by increasing the concentration of the dissolved salt (153), and three new preparative routes have been... 

The following section discusses some of the applications of calixpyrrole derivatives in aspects related to fluoride chemistry, which are relevant to environmental issues. 

J. Grarmec and L. Lozano, in Inorganic Solid Fluorides Chemistry and Physics , ed. P. Hagenmuller, Academic Press, New York, 1985, Chap. 2. 

N. Watanabe, H. Touhara, T. Nakajima, T. Mallouk, H. Selig and N. Bartlett, Foreword and Chap. 8, Fluorine Intercalation Compounds of Graphite, Inorganic Solid Fluorides, Chemistry and Physics, ed. P. Hagenmuller, Academic Press, pp. xiii-xiv and Sec. II, Chap. 8 (1985) 331. 

Birefringence of Porous Silicon ). Until quite recently, etching of highly porous structures from solid silicon was reliant on acidic fluoride chemistry however, alkali-based etches have now been shown to be at least capable of macropore generation under restricted conditions. 

Most were complete within 20 min at 23 C. This avoided some functional group issues encountered with nucleophilic fluoride chemistry and facilitated the incorporation of an fluorine into highly functionalized compounds at a very late stage in the total synthesis. In a subsequent report, the same authors were able to devise a system for catalytic fluorination... 

Hagenmuller, P., "General Trends," In Inorganic Solid Fluorides Chemistry and Physics Hagenmuller, P., Ed. Academic Orlando, FL, 1985 p 1. 

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