The Foundations of Chemistry

Exercises 999

Structures of Coordination Compounds

*22.Write formulas, and provide names for three complex

cations in each of the following categories.

(a) cations coordinated to only monodentate ligands

(b) cations coordinated to only bidentate ligands

(c) cations coordinated to two bidentate and two mono-

dentate ligands

(d) cations coordinated to one tridentate ligand, one

bidentate ligand, and one monodentate ligand

(e) cations coordinated to one tridentate ligand and three

monodentate ligands

*23.Provide formulas and names for three complex anions that

fit each description in Exercise 22.

*24.How many geometric isomers can be formed by complexes

that are (a) octahedral MA 2 B 4 and (b) octahedral MA 3 B 3?

Name any geometric isomers that can exist. Is it possible

for any of these isomers to show optical activity (exist as

enantiomers)? Explain.

*25.Write the structural formulas for (a) two isomers of

[Pt(NH 3 ) 2 Cl 2 ], (b) four isomers (including linkage isomers)

of [Co(NH 3 ) 3 (NO 2 ) 3 ], and (c) two isomers (including ion-

ization isomers) of [Pt(NH 3 ) 3 Br]Cl.

*26.Determine the number and types of isomers that would be

possible for each of the following complexes.

(a) tetraamminediaquachromium(III) ion

(b) triamminetriaquachromium(III) ion

(c) tris(ethylenediamine) chromium(III) ion

(d) dichlorobis(ethylenediamine)platinum(IV) chloride

(e) diamminedibromodichlorochromate(III) ion

*27.Indicate whether the complexes in each pair are identical

or isomers.

en

(b) 
 Cl

Cr en

NH 3

H 3 N Cl

Cl

Cr

NH 3

H 3 N

Cl

(a)

Pt

Cl

NH 3

H 3 N Br

Br Cl

Pt

Cl

NH 3

H 3 N Br

Br Cl

*28.Distinguish between constitutional (structural) isomers and

stereoisomers.

*29.Distinguish between an optically active complex and a

racemic mixture.

*30.Write the formula for a potential ionization isomer of each

of the following compounds. Name each one.

(a) [Co(NH 3 ) 4 Br 2 ]Br

(b) [Ni(en) 2 (NO 2 ) 2 ]Cl 2

(c) [Fe(NH 3 ) 5 CN]SO 4

*31.Write the formula for a potential hydrate isomer of each

of the following compounds. Name each one.

(a) [Cu(OH 2 ) 4 ]Cl 2 (b) [Ni(OH 2 ) 5 Br]BrH 2 O

*32.Write the formula for a potential coordination isomer of

each of the following compounds. Name each one.

(a) [Co(NH 3 ) 6 ][Cr(CN) 6 ] (b) [Ni(en) 3 ][Cu(CN) 4 ]

*33.Write the formula for a potential linkage isomer of each

of the following compounds. Name each one.

(a) [Co(en) 2 (NO 2 ) 2 ]Cl (b) [Cr(NH 3 ) 5 (CN)](CN) 2

Crystal Field Theory

34.Describe clearly what (^) oct is. How is (^) oct actually
measured experimentally? How is it related to the spec-
trochemical series?
35.On the basis of the spectrochemical series, determine
whether the following complexes are low spin or high
spin.
(a) [CrCl 4 Br 2 ]^3 
(b) [Co(en) 3 ]^3

(c) [Fe(OH 2 ) 6 ]^3

(d) [Fe(NO 2 ) 6 ]^3 
(d)
en
3

en
Co
NH 3
NH 3
en
3

en
Co
NH 3
NH 3
H 3 N
en
(c)
en
3
3

en
Co
NH 3
NH 3
en
Co
NH 3