The covalent bond is characterized by a di or polysynaptic basin (the corresponding localization domains are colored in green) The breaking of a covalent bond yields the splitting of the disynaptic basin into two monosynaptic ones. Among the covalent bond one can distinguish the two center bonds and the multicentric bonds.
 

Les The two center bonds are characterized by a disynaptic basin. Note that a proton is counted as a formal core (the protonated basins are represented in Skyblue).
 

      In the methanol molecule CH₃OH the localization domaine corresponnding to the CH and OH bonds are in blue, that of the CO bond in green and that of the oxygen lone pairs in red.

Multicentric bonds are characterized by a polysynaptic basin.

The diborane molecule B₂H₆ has two trisynaptic (protonated) basins (in blue) located on each side of the molecular plane. Its topology is very close to that of the isoelectronic molecule of ethylene.

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