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, with the delocalization of the
indicated by the circle.
In chemistry, delocalized electrons are
that are not associated with a single
Delocalized electrons are contained within an
that extends over several adjacent atoms. Classically, delocalized electrons can be found in
compounds. It is increasingly appreciated that electrons in
levels are also delocalized. For example, in , the bonding electrons are shared by all five atoms equally. Pervasive existence of delocalization is implicit in .
the delocalization of six
over the C6 ring is often graphically indicated by a circle. The fact that the six C-C bonds are equidistant is one indication of this delocalization. In , delocalization in benzene is represented by .
Delocalized electrons also exist in the structure of solid metals, where the
interferes with the above . Metallic structure consists of aligned positive
() in a "sea" of delocalized electrons. This means that the electrons are free to move throughout the structure, and gives rise to properties such as .
all four outer electrons of each
atom are 'localized' between the atoms in covalent bonding. The movement of electrons is restricted and diamond does not conduct an electric current. In , each carbon atom uses only 3 of its 4 outer energy level electrons in covalently bonding to three other carbon atoms in a plane. Each carbon atom contributes one electron to a delocalized system of electrons that is also a part of the chemical bonding. The delocalized electrons are free to move throughout the plane. For this reason, graphite conducts electricity along the planes of carbon atoms, but does not conduct in a direction at
to the plane.
In the case of ions it is common to speak about delocalized charge (charge delocalization) when meaning delocalized electrons. An example of delocalized electrons (delocalized charge) in ions can be found in the
group, wherein the negative charge is centered equally on the two oxygen atoms. Charge delocalization in anions is an important factor determining their reactivity (generally: the higher the extent of delocalization the lower the reactivity) and, specifically, the acid strength of their conjugate acids. As a general rule, the better delocalized is the charge in an anion the stronger is its . For example, the negative charge in
anion (ClO4-) is evenly distributed among the symmetrically oriented oxygen atoms (and a part of it is also kept by the central chlorine atom). This excellent charge delocalization combined with the high number of oxygen atoms (four) and high
of the central chlorine atom leads to
being one of the strongest known acids (with pKa values cited in the range of -7 .. -10). The extent of charge delocalization in an anion can be quantitatively expressed via the WAPS parameter.
Delocalized electrons are important for several reasons. One, an expected chemical reaction may not occur because the electrons delocalize to a more stable configuration, resulting in a reaction that happens at a different location. An example attempting the
of benzene with 1-chloro-2- the
rearranges to a tert- group stabilized by , a particular form of delocalization.
IUPAC Gold Book
Kaupmees K., Kaljurand I., Leito I. (2010). "Influence of Water Content on the Acidities in Acetonitrile. Quantifying Charge Delocalization in Anions". J. Phys. Chem. A 114: 1. :.
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