2 Homometallic Alkoxides

Metal Aryloxides 455
2Ln C 3Hg⊲C6F5⊳2 C 6HOAr ! 2[Ln⊲OAr⊳3] C 3Hg C 6C6H5F ⊲6.12⊳
where Ln = Nd, Er, Sm, Yb, Lu; HOAr = HO .
where ArO = O
.
Ph
Ph
Yb C 2TlOAr THF
! [Yb⊲OAr⊳2⊲THF⊳3] C 2Tl ⊲6.13⊳
Me 3C
Me3C
CH 3
3.2 From Aqueous or Protic Solutions of Salts
The synthesis of many metal derivatives of complexing agents such as 8hydroxyquinoline
and salicylaldehyde oxime begins with aqueous solutions of metal
ions (e.g. sulfates, nitrates, etc.). Addition of the ligand and suitable control of pH
allows either precipitation of the coordination compound or its extraction into nonprotic
media for either qualitative determination or work up (Eqs 6.14 93 and 6.15 94 ).
where HOAr = .
N
OH
Al 3C ⊲aq⊳ C 3HOAr Base
! [Al⊲OAr⊳3] ⊲6.14⊳
BeSO4.4H2O + O O O
(6.15)
OH OH
Be
H2O The synthesis of metal derivatives of strongly acidic phenols such as 2,4,6trinitrophenol
(picric acid) and 2,4-dinitrophenol (Eq. 6.16 95 ) is typically carried out
in the presence of water or other protic solvents such as acetone/alcohol mixtures.
O
OH 2
Ca 2C ⊲aq⊳ C 2HOAr NaOH
! Ca⊲OAr⊳2.7H2O ⊲6.16⊳