Co-ordinatin no. Of this complex compound [Co(NH3)4Cl2]Cl
Answers
hlo mate
• variable oxidation number
• colored
• unusual composition
• often contain covalent compounds bonded to the metal
• hydrates
• Lewis acidñbase adduct
• coordinate covalent bonds
• unusual magnetic properties
24.1 The Structure of Complexes
• Contain coordinate covalent bonds
• Unusual composition: Central metal ion or atom + ligands + counter ion (if needed)
• Called complex ion if charged
• [Cu(NH3)4]SO4
.
H2O
ligands
anion
hydrate
central metal ion
Coordination Compounds
• Complex ion: [Cu(NH3)4]
2+
• Coordination compound: K2CuCl4
• Complex ion: [CuCl4]
2ñ
• Examples in nature:
• heme
• chlorophyll
• enzymes
• Industrial catalysts; agents in electroplating baths; extraction of metals from ores
CoCl3
.
nNH3
• Consider CoCl3
.
nNH3, with n = 4, 5, 6
• How can we have compounds with these various compositions?
• Dissolve in water and add AgNO3. Some Clñ
precipitates as AgCl immediately, some
much more slowly. This indicates the relative number of Clñ
that are ionic or covalent.
• Composition Color No. Clñ
pptd Formula
CoCl3
.
6NH3 yellow 3 [Co(NH3)6]Cl3
CoCl3
.
5NH3 purple 2 [Co(NH3)5Cl]Cl2
CoCl3
.
4NH3 green 1 [Co(NH3)4Cl2]Cl
CoCl3
.
4NH3 violet 1 [Co(NH3)4Cl2]Cl
• The green and violet compounds must have some further difference.
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