Difluoroacetylene, C2F2, is a compound of carbon and fluorine. A linear molecule, its two carbons are joined by a triple bond and have terminal fluorines: F-C≡C-F. The molecule is the perfluorocarbon analog of acetylene, C2H2. Preparation of difluoracetylene is difficult, with danger of explosions and with low yields. Nevertheless, the compound has been made, isolated, and characterized by NMR and IR spectroscopy. The compound is of interest as a precursor to fluoropolymers containing double bonds, analogous to polyacetylene.
Bibliography
Trifu, Roxana Melita (1999). Homopolymers of dihaloacetylenes (Ph.D. thesis, University of Illinois at Chicago). ProQuest.
Comet C/2009 F6 (Yi–SWAN) is a non-periodic comet which appeared in March 2009.
It was first discovered by Korean amateur astronomer Dae-am Yi on March 26, 2009, using a Canon 5D camera and 90-mm lens. It is believed to be the first comet discovered by a Korean in the modern age. Independently, on April 4 Rob Matson reported he had discovered a comet in the SWAN instrument photographs on the SOHO (Solar and Heliospheric Observatory) spacecraft website.
The comet was not bright enough to be seen by the naked eye, but was theoretically visible through amateur telescopes. However, it was harder to see than predicted, as it remained quite small and did not form much of a visible tail. It reached a peak magnitude around +8.5 in April into May, and passed 1.5 degrees south of the Double cluster in Perseus on April 23.
Hexafluoroethane's solid phase has two polymorphs. In the scientific literature, different phase transition temperatures have been stated. The latest works assign it at 103 K (−170°C). Below 103 K it has a slightly disordered structure, and over the transition point, it has a body centered cubic structure.
Table of densities:
Vapor density is 4.823 (air = 1), specific gravity at 21°C is 4.773 (air = 1) and specific volume at 21°C is 0.1748m3/kg.
Uses
Hexafluoroethane is used as a versatile etchant in semiconductor manufacturing. It can be used for selective etching of metal silicides and oxides versus their metal substrates and also for etching of silicon dioxide over silicon. The primary aluminium and the semiconductor manufacturing industries are the major emitters of hexafluoroethane.
C/F International was a company that licensed television programming to stations, home video companies and other outlets around the world. Its Businessweek profile stated that:
The company's founder and principal was Burt Rosen, a Christopher Award co-winner, whose reputation was initially established as a television producer. Rosen was also an Emmy Award and a Peabody Award winner.
In later years, the company had been engaged in litigation in relation to ownership and licensing interests involving singer Tom Jones. For example, as of December, 2004, C/F International was a secured judgement creditor of Classic World Productions and it principal, Darryl Payne, for approximately one million dollars, and was the principal secured creditor at the time of the subsequent bankruptcy filing by the company. C/F International's action against Classic World Productions and owner Darryl Payne was based on unpaid royalties in relation to the Tom Jones 1969-1971 ITC/ABC variety series, This Is Tom Jones, and related recordings.
When we go I'm falling down to the river I'm gonna climb another mountain I'm going down to the mountain I'm coming up from below I'm gonna climb as high as I can I ain't got no other place to go Down to the river I'm going down to the river I'm going to spread myself around I'm going down to the river Spread myself around How much time How much time How much time
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