1. Complexes in Which the Acceptor Is A Metal Ion and the Donor an
Alkene or an Aromatic Ring (n donors do not give EDA complexes with
metal ions but form covalent bonds instead).83 Many metal ions form
complexes, that are often stable solids, with alkenes, dienes (usually
conjugated, but not always), alkynes, and aromatic rings. The donor (or
ligand) molecules in these complexes are classified by the prefix hapto84
and/or the descriptor Zn (the Greek letter eta), where n indicates how many
atoms the ligand uses to bond with the metal.85 The generally accepted
picture of the bonding in these complexes,86 first proposed by Dewar,87 can beillustrated by the ethylene complex with silver, 9, in which the alkene unit forms
an Z2-complex with the silver ion (the alkene functions as a 2-electron donating
ligand to the metal). There is evidence of p-complexation of Naþ by CC.88
1. Complexes in Which the Acceptor Is A Metal Ion and the Donor an
Alkene or an Aromatic Ring (n donors do not give EDA complexes with
metal ions but form covalent bonds instead).83 Many metal ions form
complexes, that are often stable solids, with alkenes, dienes (usually
conjugated, but not always), alkynes, and aromatic rings. The donor (or
ligand) molecules in these complexes are classified by the prefix hapto84
and/or the descriptor Zn (the Greek letter eta), where n indicates how many
atoms the ligand uses to bond with the metal.85 The generally accepted
picture of the bonding in these complexes,86 first proposed by Dewar,87 can beillustrated by the ethylene complex with silver, 9, in which the alkene unit forms
an Z2-complex with the silver ion (the alkene functions as a 2-electron donating
ligand to the metal). There is evidence of p-complexation of Naþ by CC.88
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