Coordination Compounds — Practice

Question 1

Write the IUPAC name of K3[Fe(C2O4)3].

Accepted Answer

Potassium trioxalatoferrate(III). Oxalate is bidentate, so three oxalates give coordination number 6.

Question 2

What isomerism is shown by [Co(NH3)5(ONO)]2+ and [Co(NH3)5(NO2)]2+?

Accepted Answer

Linkage isomerism, because the ambidentate ligand NO2- can bond through nitrogen (nitro) or oxygen (nitrito).

Question 3

[Fe(H2O)6]3+ has 5 unpaired electrons while [Fe(CN)6]3- has 1. Explain.

Accepted Answer

H2O is a weak field ligand, so Delta_o is small and electrons occupy eg before pairing, giving high spin (5 unpaired). CN- is a strong field ligand, so Delta_o is large and electrons pair in t2g before occupying eg, giving low spin (1 unpaired).

Question 4

What is the coordination number of Co in [Co(NH3)4Cl2]+?

Accepted Answer

6 -- four NH3 and two Cl- each donate one atom, giving octahedral geometry.

Question 5

Name one medicinal application of a coordination compound.

Accepted Answer

Cisplatin, [Pt(NH3)2Cl2], is an anticancer drug that binds DNA and prevents cell division, used against testicular and ovarian cancers.

Practice — Coordination Compounds

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