ISOLOBAL ANALOGY PDF

The parallels between organic and inorganic compounds were first described by Roald Hoffman, a Nobel laureate in chemistry, He developed the concept of isolobal analogy or principle to show the connection between two important areas of chemistry. According to this concept,. The isolobal fragments may not be isostructural and isoelectronic. They only possess similar characteristics for the frontier molecular orbitals. The relation between isolobal fragments is indicated by double headed twirly arrows i.

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The parallels between organic and inorganic compounds were first described by Roald Hoffman, a Nobel laureate in chemistry, He developed the concept of isolobal analogy or principle to show the connection between two important areas of chemistry.

According to this concept,. The isolobal fragments may not be isostructural and isoelectronic. They only possess similar characteristics for the frontier molecular orbitals. The relation between isolobal fragments is indicated by double headed twirly arrows i. These isolobal fragments provide electrons for cluster bonding that lead to variety of cluster molecules, at least theoretically.

These can contribute 2 electrons for cluster bonding. Note: The number of skeletal electrons SE that can be contributed for cluster bonding by a molecular fragment can be calculated as follows. Starting from methane, a molecule that obeys octet rule, fragments like CH 3 , CH 2 , CH can be obtained by homolytic cleavage of a successive C—H bonds as shown below. In this case, the Cr metal is replaced by Mn to remove the negative charge when the proton number increases, the excess negative charge is neutralized.

Thus it is possible to draw the following isolobal analogy between metal complexes and organic moeities. It may or may not be possible to synthesize the new molecule generated by the isolobal transformation.

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Isolobal principle

The isolobal principle more formally known as the isolobal analogy is a strategy used in organometallic chemistry to relate the structure of organic and inorganic molecular fragments in order to predict bonding properties of organometallic compounds. Isolobal compounds are analogues to isoelectronic compounds that share the same number of valence electrons and structure. A graphic representation of isolobal structures, with the isolobal pairs connected through a double-headed arrow with half an orbital below, is found in Figure 1. For his work on the isolobal analogy, Hoffmann was awarded the Nobel Prize in Chemistry in , which he shared with Kenichi Fukui. To begin to generate an isolobal fragment, the molecule needs to follow certain criteria. For example, methane is a simple molecule from which to form a main group fragment.

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