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Fluorine as straight (a) or bent (b) bridging ligands [1]. Fluorine forms a great variety of chemical compounds, within which it always adopts an oxidation state of −1. With other atoms, fluorine forms either polar covalent bonds or ionic bonds.
Frederick Sanger. In 1945, Frederick Sanger described its use for determining the N-terminal amino acid in polypeptide chains, in particular insulin. [4] Sanger's initial results suggested that insulin was a smaller molecule than previously estimated (molecular weight 12,000), and that it consisted of four chains (two ending in glycine and two ending in phenylalanine), with the chains cross ...
This multi-page article lists pharmaceutical drugs alphabetically by name. Many drugs have more than one name and, therefore, the same drug may be listed more than once. ...
[70] [71] [note 5] He penned the Latin word fluorēs (fluor, flow) for fluorite rocks. The name later evolved into fluorspar (still commonly used) and then fluorite. [64] [75] [76] The composition of fluorite was later determined to be calcium difluoride. [77] Hydrofluoric acid was used in glass etching from 1720 onward.
Structure of [(C 5 Me 5) 2 Ti(FC 6 H 5)] +, a coordination complex of fluorobenzene.. PhF is a useful solvent for highly reactive species. Its melting point at -44 °C is lower than that of benzene.
Atmospheric concentration of SF 6, NF 3, and several widely used HFCs and PFCs between years 1978 and 2015 (right graph).Note the logarithmic scale. The most common F-gases are hydrofluorocarbons (HFCs), which contain hydrogen, fluorine, and carbon.
Fluor has been involved in the project since 2011 performing support services for both the pre-front-end engineering and design (pre-FEED) and the FEED work for this project. TDI is a key ...
BF can react with itself to form polymers of boron containing fluorine with between 10 and 14 boron atoms. BF reacts with BF 3 to form B 2 F 4. BF and B 2 F 4 further combine to form B 3 F 5. B 3 F 5 is unstable above −50 °C and forms B 8 F 12. This substance is a yellow oil. [7] BF reacts with acetylenes to make the 1,4-diboracyclohexadiene ...