Search results
Results from the WOW.Com Content Network
Due to a stronger resonance effect and inductive effect than the heavier halogens, fluorine is anomalous. The partial rate factor of electrophilic aromatic substitution on fluorobenzene is often larger than one at the para position, making it an activating group. [ 11 ]
The O–F bond of hypofluorites is relatively weak. For trifluoromethyl hypofluorite (CF 3 OF), it has been estimated to be 43.5 kcal/mol (182 kJ/mol). [9] The ability of trifluoromethyl hypofluorite to transfer fluorine to alkyl radicals is notably demonstrated by reacting independently generated ethyl radicals from ethene and tritium in the presence of CF 3 OF. [10]
Fluorine's chemistry is dominated by its strong tendency to gain an electron. It is the most electronegative element and elemental fluorine is a strong oxidant. The removal of an electron from a fluorine atom requires so much energy that no known reagents are known to oxidize fluorine to any positive oxidation state. [20]
George A. Olah, Nobel Prize in Chemistry winner in 1994, gave a plenary lecture at the 15th ISFC (Vancouver, 1997). [5] The Book of Abstracts of 13th ISFC has been published as a special issue of the Journal of Fluorine Chemistry. [6] The Book of Abstract of 21st ISFC can be tracked by its ISBN. [7]
In chemistry, a fluoroanion or fluorometallate anion is a polyatomic anion that contains one or more fluorine atoms. The ions and salts form from them are also known as complex fluorides. They can occur in salts, or in solution, but seldom as pure acids. Fluoroanions often contain elements in higher oxidation states. They mostly can be ...
The mechanism of electrophilic fluorination remains controversial. At issue is whether the reaction proceeds via an S N 2 or single-electron transfer (SET) process. In support of the S N 2 mechanism, aryl Grignard reagents and aryllithiums give similar yields of fluorobenzene in combination with N-fluoro-o-benzenedisulfonimide (NFOBS), even though the tendencies of these reagents to ...
Ammonium fluoride adopts the wurtzite crystal structure, in which both the ammonium cations and the fluoride anions are stacked in ABABAB... layers, each being tetrahedrally surrounded by four of the other.
The energy stored in the bending strain of the fluoride ion is proportional to the fourth power of the displacement angle, unlike most other materials where it is proportional to the square of the displacement. A fluorine atom is bound to two scandium atoms, and as temperature increases the fluorine oscillates more perpendicularly to its bonds.