1. Starter Electronic configuration of: Sc3+ Fe2+ Cu+
2) Suggest and explain the colour of compounds containing Zn2+

3. Transition metals and complex ions
L.O.:
Explain the term ligand in terms of coordinate bonding.
Describe and use the terms: complex ion and coordination number.
State and give examples of complexes with six-fold coordination with an octahedral shape.

4. Complex ion [Fe(H2O)6]2+

5. Complex ions - Definations
LIGAND – molecule or ion that can donate a pair of electrons to form a coordinate or dative covalent bond
COORDINATE BOND – a bond where both electrons are provided for by the same atom. It is the same as a dative covalent bond but involves transition metals instead.
COMPLEX ION – A transition metal ion bonded to one or more ligands by coordinate bonds (dative covalent bonds)

6. Coordination number
This is the number of coordinate bonds are attached to the central metal ion
E.g. [Fe(H2O)6 ]2+
The overall charge of this complex is the sum of the metal charges and the charges on the ions that it is coordinated to

7. Calculate the oxidation number of the metal in:
[Cu(NH3)(H2O)]2+
[Co(H2O)5Cl]+

8. Cobalt complex containing 6 monodentate ligands
Notice the shape adopted by this complex, what is it and what are the bond angles?

9. [Co(H2O)6]2+ is an octahedral complex ion9

10. L.O.:
Describe stereoisomerism in transition metal complexes using examples of cis–trans and optical isomerism.
Describe the use of cis–platin as an anti-cancer drug, and its action by binding to DNA.

11. Cis–trans isomerism in [Co(NH3)4Cl2]+

12. Cis–trans isomerism in [NiCl2(NH3)2]12

13. Structure of cis-platin13

14. L.O.:
Explain and use the term: bidentate ligand (e.g. NH2CH2CH2NH2, ‘en’).
Describe stereoisomerism in transition element multidentate complexes using examples of cis–trans and optical isomerism.

15. Structure of the ethanedioate ligand, C2O42–
Bidentate: it can donate two lone pairs of electrons to the central metal ion to form two coordianate bonds 15

16. More bidentate ligands:
ethane-1,2-diamine, NH2CH2CH2NH2

17. Complex ion [Ni(en)3]2+

18. Cis–trans isomerism in [Co(NH3)4Cl2]+

19. Cis and trans isomers of [Cr(C2O4)2(H2O)2]–19

20. Structure of cis-platin20

21. Optical isomers of [Ni(NH2CH2CH2NH2)3]2+21

22. Optical isomerism

23. Necessary conditions for optical isomerism
Complexes must have either: 3 bidentate ligands, e.g. [Ni(en)3 ]2+ 2 bidentate and 2 monodentate ligands, e.g. [Co(en)2 Cl2 ] 1 hexadentate ligand – e.g. [Cu(EDTA)]2-

24. Drawing optical isomers
First draw the bonds around the metal ion
Then add the ligands to the first complex
Then complete the second complex as a mirror image of the first