_P.-Powell-auth.-Principles-of-Organometallic-Chemistry-Springer-Netherlands-1988

M Complex
L
1
' 1
1 1
1 1
li ' '
g =----r------= '
/ r /.
/ [J.o /
~~-/',, l /
' '
', '
(a)
1
M
e~=-=
Complex
6.o
-t-
-~-
,..,,....-----· .,
t2g=------ \
~ '
' '
' ' ' \
' '
\\, /-/~-~g
, ___ /
, ___ ,
L
(b)
filled empty
(o)
empty filled
Fig. 5.3 Effect of n-bonding on separation. (a) n-acceptor ligands, (b) n-donor ligands.
( b)
Table 5.1. Scope of the 18-electron rule
18-electron rulr
useful
Intermediate
18 -electron rule
not useful
Ligands
Compounds
CO, NO, N 2 , CS. RNC
C 2 H 4 , unsaturated
hydrocarbons
R,P especially PF,. P(OR),
Carbonyls, nitrosyls.
organometallics
phosphine complexes
H, CH,, C.,H 5 , CN NH,. H 2 0, F, CI, Br. I
OR
2. 2'-bipyridyl -0-(=0)
R 2 S. RS, -S-
Halides, oxides,
aquo complexes
alkoxides, ammines,
151