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CLASS 12, CHEMISTRY , CHAPTER NO. 9
COORDINATION COMPOUNDS
Page 2


CLASS 12, CHEMISTRY , CHAPTER NO. 9
COORDINATION COMPOUNDS
REVISED SYLLABUS FOR 2020-21
• Coordination compounds - Introduction, 
• ligands, 
• coordination number,
• colour. 
• Magnetic properties and shapes. 
• IUPAC nomenclature of mononuclear 
coordination compounds. 
• Bonding - Werner's theory, VBT, and CFT.
Page 3


CLASS 12, CHEMISTRY , CHAPTER NO. 9
COORDINATION COMPOUNDS
REVISED SYLLABUS FOR 2020-21
• Coordination compounds - Introduction, 
• ligands, 
• coordination number,
• colour. 
• Magnetic properties and shapes. 
• IUPAC nomenclature of mononuclear 
coordination compounds. 
• Bonding - Werner's theory, VBT, and CFT.
COORDINATION COMPOUDS IN OUR DAILY LIFE
• Earlier, these compounds were called as complex compounds.
• Chlorophyll, haemoglobin and
vitamin B
12
are coordination
compounds of magnesium,
iron and cobalt respectively.
• Variety of metallurgical
processes, industrial catalysts
and analytical reagents involve
the use of coordination
compounds.
• Coordination compounds also
find many applications in
electroplating, textile dyeing
and medicinal chemistry.
vitamin B
12
haemoglobin
Page 4


CLASS 12, CHEMISTRY , CHAPTER NO. 9
COORDINATION COMPOUNDS
REVISED SYLLABUS FOR 2020-21
• Coordination compounds - Introduction, 
• ligands, 
• coordination number,
• colour. 
• Magnetic properties and shapes. 
• IUPAC nomenclature of mononuclear 
coordination compounds. 
• Bonding - Werner's theory, VBT, and CFT.
COORDINATION COMPOUDS IN OUR DAILY LIFE
• Earlier, these compounds were called as complex compounds.
• Chlorophyll, haemoglobin and
vitamin B
12
are coordination
compounds of magnesium,
iron and cobalt respectively.
• Variety of metallurgical
processes, industrial catalysts
and analytical reagents involve
the use of coordination
compounds.
• Coordination compounds also
find many applications in
electroplating, textile dyeing
and medicinal chemistry.
vitamin B
12
haemoglobin
COORDINATION COMPOUNDS DISCOVERY
• The sustained and systematic development of modern coordination chemistry 
began with the discovery by the French chemist B.M. Tassaert in 1798 that 
ammoniacal solutions of cobalt chloride (CoCl
3
) develops a brownish- red 
colour.
• Further experiments were done by other scientists on this solutions and it was 
found that it was a mixture of various coloured compounds of Co, Cl and NH
3
.
• These compounds were separated and it was found that in these compounds, 
the no. of Co and Cl atoms remain same but no. of NH
3
molecules changes. 
And simultaneously the colour of the compounds change.
• When 1 mole of each of these compounds was treated with excess AgNO
3
solution, different no. of moles of AgCl were precipitated as shown in the table 
below.
Page 5


CLASS 12, CHEMISTRY , CHAPTER NO. 9
COORDINATION COMPOUNDS
REVISED SYLLABUS FOR 2020-21
• Coordination compounds - Introduction, 
• ligands, 
• coordination number,
• colour. 
• Magnetic properties and shapes. 
• IUPAC nomenclature of mononuclear 
coordination compounds. 
• Bonding - Werner's theory, VBT, and CFT.
COORDINATION COMPOUDS IN OUR DAILY LIFE
• Earlier, these compounds were called as complex compounds.
• Chlorophyll, haemoglobin and
vitamin B
12
are coordination
compounds of magnesium,
iron and cobalt respectively.
• Variety of metallurgical
processes, industrial catalysts
and analytical reagents involve
the use of coordination
compounds.
• Coordination compounds also
find many applications in
electroplating, textile dyeing
and medicinal chemistry.
vitamin B
12
haemoglobin
COORDINATION COMPOUNDS DISCOVERY
• The sustained and systematic development of modern coordination chemistry 
began with the discovery by the French chemist B.M. Tassaert in 1798 that 
ammoniacal solutions of cobalt chloride (CoCl
3
) develops a brownish- red 
colour.
• Further experiments were done by other scientists on this solutions and it was 
found that it was a mixture of various coloured compounds of Co, Cl and NH
3
.
• These compounds were separated and it was found that in these compounds, 
the no. of Co and Cl atoms remain same but no. of NH
3
molecules changes. 
And simultaneously the colour of the compounds change.
• When 1 mole of each of these compounds was treated with excess AgNO
3
solution, different no. of moles of AgCl were precipitated as shown in the table 
below.
The above results can be explained if we consider
the following chemical structure of the above
compounds:
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150 videos|378 docs|213 tests
150 videos|378 docs|213 tests
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