IC-Lewis acid strengths application (3) Stability Constants of Metal Ions*

Yonghe Zhang
American Huilin Institute


3.3 Stability Constants of Metal Ions

 

Following tables show that for a given ligand the IC Lewis acid strengths Lic show the good correlation with the corresponding stability constants of complexes of metal cations, which agree fairly well with the previous classifications (Numbers in parentheses indicate ion strengths for ligands).More detail are shown in Table 1

 

3.3.1 For the ligand [M(en)3]2- and [M(EDTA)]2- with the first transition metal ions [23]

 

Cations

Mn2+

Fe2+

Co2+

Ni2+

Cu2+

Zn2+

IC

2.719

2.786

2.874

3.029

3.155

2.772

Xic

1.507

1.535

1.571

1.635

1.687

1.529

Logβ for[M(en)3]2-

5.7

9.5

13.8

18.6

18.7

12.1

Logβ for[M(EDTA)]2-

13.8

14.3

16.3

18.6

18.7

16.1

 

 

3.3.2 For the ligand CN-L2 with the transition metal ions [24, 25]

 

Cations

Au+

Hg2+

Cu+

Ag+

Cd2+

H+

IC

2.689

3.118

2.343

2.147

2.658

2.703

Xza

1.495

1.672

1.352

1.271

1.482

1.501

Lic

-1.595

-0.557

0.295

0.384

0.579

7.557

log β

38.3 (0)

34.70

24.00

21.10.2

10.6 (3

9.2(L1,0.1)

.

 

3.3.3 For the ligand CN-L4 with the transition metal ions [24, 25]

 

Cations

Au3+

Pd2+

Hg2+

Tl+3

Cu+

Ag+

Pb2+

IC

3.965

3.042

3.118

3.307

2.343

2.147

2.574

Xza

2.021

1.640

1.672

1.749

1.352

1.271

1.447

Lic

-2.154

-0.743

-0.557

0.205

0.295

0.384

0.515

log β

56(0)

42.2(0)

41.5(0.1)

35(v)

30.3(0)

20.7(0.2)

10.3(1.0)

 

 

3.3.4 For the ligand SCN- L2 with the transition metal ions [24, 25]

 

Cations

Au3+

Au+

Hg2+

Cu+

Ag+

Pb2+

IC

3.965

2.689

3.118

2.343

2.147

2.574

Xza

2.021

1.495

1.672

1.352

1.271

1.447

Lic

-2.154

-1.595

-0.557

0.295

0.384

0.515

log β

42(v)

25(v)

16.1(1)

11.0(5)

8.2(2.2)

1.4(2.0)

 

 

3.3.5 For the ligand Cl- L1 with the transition metal ions [24, 25]

 

 

Cations

Hg2+

Tl+3

Ag+

Pb2+

Cd2+

Cu2+

Zn2+

Th4+

IC

3.118

3.307

2.147

2.574

2.658

3.155

2.772

2.798

Xza

1.672

1.749

1.271

1.447

1.482

1.687

1.529

1.540

Lic

-0.557

0.205

0.384

0.515

0.579

0.622

0.697

1.056

log β

6.74(0.5)

6.25(0)

3.4((v)

1.60

1.42(0)

0.98(0.7)

0.72v

0.23

 

 

3.3.6 For the ligand Br- L1 with the transition metal ions [24, 25]

 

Cations

Hg2+

Tl+3

Ag+

Pb2+

Cd2+

Cu2+

Zn2+

Fe2+

IC

3.118

3.307

2.147

2.574

2.658

3.155

2.772

2.786

Xza

1.672

1.749

1.271

1.447

1.482

1.687

1.529

1.535

Lic

-0.557

0.205

0.384

0.515

0.579

0.622

0.697

1.952

log β

9.05(0.5)

8.30(0.4)

4.15(0.1)

1.56(1)

1.56(0.7)

0.55(2.0)

0.6(4.5)

0.21(1)


[*] Zhang, Y.Ionocovalency and Applications. 2. IC-Lewis acid strengthsJ. Am. huilin. Ins. 2011, 11, 1-10

      Zhang, Y. Ionocovalency, J. Am. huilin. Ins. 2011, 5, 1-11  

      Zhang, Y. Ionocovalency and Applications 1. Ionocovalency Model and             Orbital Hybrid Scales. Int. J. Mol. Sci. 201011, 4381-4406 

 

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