The Foundations of Chemistry

TABLE 25-5 Some Ligands and Coordination Spheres (complexes)

Coordination Oxidation Coordination

Ligand(s) Classification Sphere Number of M Number of M

NH 3 monodentate [Co(NH 3 ) 6 ]^3

3 6
ammine hexaamminecobalt(III)

bidentate 
 3 6

Br monodentate
bromo
H 2 NXCH 2 XCH 2 XNH 2 bidentate
2 4
ethylenediamine (en)

tridentate 
 3 6

hexadentate 
 3 6

H 2 NCH 2 CH 2 NH 2

(or N N)
ethylenediamine (en)

H 2

N

N

H 2

CH 2

3

3 

CH 2

Co

[Co(en) 3 ]^3 


tris(ethylenediamine)-

cobalt(III) ion

H 2

N

N

H 2

CH 2

0

CH 2

Cu Br 2

[Cu(en)Br 2 ]

dibromoethylenediamine-

copper(II)

H 2 NNH(CH 2 ) 2 N 2

H

(CH 2 ) 2

(or N N N)
diethylenetriamine (dien)

H 2

N

N

H 2

CH 22

3 

CH 2

CH 2

CH 2

Fe

[Fe(dien) 2 ]^3 


bis(diethylenetriamine)-

iron(III) ion

H

N

N

N

(CH 2 ) 2

C

O

CH 2

ethylenediaminetetraacetato (edta)

C

C C

OO

OO

CH 2

CH 2 CH 2



O



O O

Co

N O

N O



H 2 C O O

O

C

H 2 C

H 2

C

C C

C

H 2

H 2 C

H 2 C O

O

O

C

[Co(edta)]

(ethylenediaminetetraacetato)-

cobaltate(III) ion

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

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