Question

Write down the IUPAC name for each of the following complexes and indicate the oxidation state, electronic configuration and coordination number. Also give stereochemistry and magnetic moment of the complex:

(i) K[Cr(H₂O)₂(C₂O₄)2].3H₂O
(ii) [Co(NH₃)₅Cl]Cl₂
(iii) CrCl₃(py)₃
(iv) Cs[FeCl₄]
(v) K₄[Mn(CN)₆]

Answer 1

(i) Potassium diaquadioxalatochromate (III) trihydrate.

Oxidation state of chromium = 3
Electronic configuration: 3d³: t_2g³
Coordination number = 6
Shape: octahedral Stereochemistry:

(iii) CrCl₃(py)₃
IUPAC name: Trichloridotripyridinechromium (III)
Oxidation state of chromium = +3
Electronic configuration for d³ = t_2g 3
Coordination number = 6 Shape:
octahedral.
Stereochemistry

(v) K₄[Mn(CN)₆]
Potassium hexacyanomanganate(II)
Oxidation state of manganese = +2
Electronic configuration: d5+: t_2g 5
Coordination number = 6 Shape:
octahedral.