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Quaternary ammonium cation. The R groups may be the same or different alkyl or aryl groups. Also, the R groups may be connected. In organic chemistry, quaternary ammonium cations, also known as quats, are positively-charged polyatomic ions of the structure [NR 4] +, where R is an alkyl group, an aryl group [1] or organyl group.
The term molecule may or may not be used to refer to a polyatomic ion, depending on the definition used. The prefix poly-carries the meaning "many" in Greek, but even ions of two atoms are commonly described as polyatomic. [2] In older literature, a polyatomic ion may instead be referred to as a radical (or less commonly, as a radical group).
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Petroleum refinery in Anacortes, Washington, United States. Petroleum refining processes are the chemical engineering processes and other facilities used in petroleum refineries (also referred to as oil refineries) to transform crude oil into useful products such as liquefied petroleum gas (LPG), gasoline or petrol, kerosene, jet fuel, diesel oil and fuel oils.
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The polyatomic ion C 4− 3, sometimes called allylide, is found in Li 4 C 3 and Mg 2 C 3. The ion is linear and is isoelectronic with CO 2. [2] The C–C distance in Mg 2 C 3 is 133.2 pm. [12] Mg 2 C 3 yields methylacetylene, CH 3 CCH, and propadiene, CH 2 CCH 2, on hydrolysis, which was the first indication that it contains C 4− 3.
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