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Question
Chemistry
What is the most likely configuration of the cobalt d-electrons for the species, [CoCl6]3- and [Co(NO2)6]3-?
Q. What is the most likely configuration of the cobalt d-electrons for the species,
[
C
o
C
l
6
]
3
−
and
[
C
o
(
N
O
2
)
6
]
3
−
?
2005
200
Coordination Compounds
Report Error
A
[
C
o
C
l
6
]
3
−
: low spin;
[
C
o
(
N
O
2
)
6
]
3
−
: low spin
17%
B
[
C
o
C
l
6
]
3
−
: high spin;
[
C
o
(
N
O
2
)
6
]
3
−
: low spin
42%
C
[
C
o
C
l
6
]
3
−
: low spin;
[
C
o
(
N
O
2
)
6
]
3
−
: high spin
33%
D
[
C
o
C
l
6
]
3
−
: high spin;
[
C
o
(
N
O
2
)
6
]
3
−
: high spin
7%
Solution:
Weak field ligands (like
C
l
−
) giving low value of
Δ
o
, form high spin octahedral complexes whereas strong field ligands (like
N
O
2
−
) give rise to low spin (spin paired) complexes.