Heteropolar Multiple
Bonds
Table
of mean bond energies (kJ mol-1)
|
B=O
|
820
|
C=O
(CO2)
|
800
|
N=O
|
607
|
|
|
|
|
|
B=S
|
522
|
C O
(CO)
|
1072
|
P=O
|
544
|
S=O
(SO2)
|
532
|
Cl=O
|
220
|
|
|
|
C=N
|
615
|
P=S
|
335
|
S=O
(SO3)
|
469
|
|
|
|
|
|
CN
|
887
|
As=O
|
389
|
Se=O
|
350
|
|
|
|
|
|
C=S
|
573
|
|
|
Te=O
|
330
|
|
|
|
|
|
Si=C
|
460
|
|
|
|
|
|
|
|
|
|
Si=O
|
638
|
|
|
|
|
|
|
|
|
|
SiO
|
805
|
|
|
|
|
|
|
|
|
|
Ge=O
|
500
|
|
|
|
|
|
|
Trends similar to homopolar
bond energies
Down group, Bond energy
decrease as overlap decreases
Across period, Bond
energy decreases as core repulsion increases
(E=O) > (E=S), overlap
and core replusion
(E=O) > (E=N), due to
overlap considerations