In the case of the silver complex, the bond is not from one atom of the CC
unit to the silver ion, but from the p center such that two electrons are
transferred from the alkene to the metal ion.89 Ethene has two p-electrons
and is a dihapto or Z2 ligand, as are other simple alkenes. Similarly, benzene
has six p-electrons and is a hexahapto or Z6 ligand. Ferrocene (10) has
two cyclopentadienyl ligands (each is a five-electron donor or an Z5 ligand),
and ferrocene is properly called bis(Z5-cyclopentadienyl)iron(II). This
system can be extended to compounds in which only a single s bond
connects the organic group to the metal, for example, C6H5–Li (a monohapto
or Z1 ligand), and to complexes in which the organic group is an ion,
for example, p-allyl complexes, such as 11, in which the allyl ligand is
trihapto or Z3. Note that in a compound such as allyllithium, where a s
bond connects the carbon to the metal, the allyl group is referred to as
monohapto or Z1.
In the case of the silver complex, the bond is not from one atom of the CCunit to the silver ion, but from the p center such that two electrons aretransferred from the alkene to the metal ion.89 Ethene has two p-electronsand is a dihapto or Z2 ligand, as are other simple alkenes. Similarly, benzenehas six p-electrons and is a hexahapto or Z6 ligand. Ferrocene (10) hastwo cyclopentadienyl ligands (each is a five-electron donor or an Z5 ligand),and ferrocene is properly called bis(Z5-cyclopentadienyl)iron(II). Thissystem can be extended to compounds in which only a single s bondconnects the organic group to the metal, for example, C6H5–Li (a monohaptoor Z1 ligand), and to complexes in which the organic group is an ion,for example, p-allyl complexes, such as 11, in which the allyl ligand istrihapto or Z3. Note that in a compound such as allyllithium, where a sbond connects the carbon to the metal, the allyl group is referred to asmonohapto or Z1.
การแปล กรุณารอสักครู่..
