Coordination Compound

1
Chapter 12
Coordination Compound
2
Coordination compounds(or complexs) are closely
related to the chemistry of transition metals
Main topics
? Fundamental Concepts of CC
? Valence Bond Theory of CC
? Crystal Field Theory of CC
3
Why Study chemistry of complex

• ? Transition metals are found in nature
• Rocks and minerals contain transition metals
• The color of many gemstones is due to the
  presence of transition metal ions
• Rubies(???) are red due to Cr(chromium)
• Sapphires(???) are blue due to Fe and
  Ti(titanium)
• Many biomolecules contain transition metals that
  are involved in the functions of these
  biomolecules
• Vitamin B12 contains Co(cobalt)
• Hemoglobin, myoglobin, and cytochrome C contain Fe

4
Colour of transition metal complexes
Ruby Corundum Al2O3 with Cr3 impurities
Sapphire Corundum Al2O3 with Fe2 and Ti4
impurities
octahedral metal centre coordination number 6
Emerald Beryl AlSiO3 containing Be with Cr3
impurities
5
Why Study chemistry of complex

• ? Transition metals and their compounds have
  many useful applications
• Fe is used to make steel and stainless steel
• Ti is used to make lightweight alloys
• Transition metal compounds are used as pigments
• TiO2 white
• PbCrO4 yellow
• Fe4Fe(CN)63 (prussian blue, ????) blue
• Transition metal compounds are used in many
  industrial processes

6
Why Study chemistry of complex

• ? To understand the uses and applications of
  transition metals and their compounds, we need to
  understand their chemistry.
• ? Our focus will be on the 4th period transition
  elements.

7
Fig. 23.1
8
Fig. 23.3
9
Fig. 23.4
10
Periodic Table
d block transition elements
f block transition elements
11
Transition Metals

• ? General Properties
• Have typical metallic properties
• Not as reactive as Grp. IA, IIA metals
• Have high MP