a) A coordination compound has the formula CoCl4NH. It does not liberate ammonia but precipitates chloride with AgNO (one mole AgCl per mole of compound). Write the structure and IUPAC name of the complex compound.
b) Name a ligand which is bidentate and give an example of the complex formed by this ligand.
b) Name a ligand which is bidentate and give an example of the complex formed by this ligand.
Answer: (a) [Co(NH₃)₄Cl₂]Cl — tetraamminedichloridocobalt(III) chloride. (b) Ethane-1,2-diamine (en); e.g. [Co(en)₃]³⁺.
Solution
(a) All four NH are coordinated (none liberated); only one Cl is ionisable (1 mol AgCl), so two Cl sit inside the sphere:
Name: \textbf{tetraamminedichloridocobalt(III) chloride}.
(b) Bidentate ligand: ethane-1,2-diamine (en), donating through both N atoms — e.g. tris(ethane-1,2-diamine)cobalt(III) ion, [Co(en)].
Name: \textbf{tetraamminedichloridocobalt(III) chloride}.
(b) Bidentate ligand: ethane-1,2-diamine (en), donating through both N atoms — e.g. tris(ethane-1,2-diamine)cobalt(III) ion, [Co(en)].
CBSE Class 12 Board · 2003 · Delhi Compartment · Subjective