Coordination Compounds
Read p1037 – 1042 in Silberberg and complete the worksheet below.
A coordination compound is a substance that contains at least one ______________________
Complex ions are composed of a central metal atom (usually transition metal) surrounded by two
or more atoms or groups of atoms called ________________________________________.
Complex ions can often be recognized because they are surrounded by square brackets. In
order to maintain neutrality, complex ions are associated with _______________________ in
the coordination compound. Identify the parts of the coordination compound shown.
[Co(NH3)6]Cl3
Identify the following as coordination compounds or complex ions. If complex ions indicate if
they are cationic or anionic. For example [Co(NH3)6]3+ is a cationic complex ion.
a)
[Ru(NH3)5(N2)]Cl2
b)
[Ru(NH3)5(N2)]2+
c)
[PtNH3Cl2(C5H5N)]
d)
[IF6]-
e)
K[IF6]
Complex Ions: Coordination Numbers, Geometries, and Ligands
Complete the following table.
Definition
Coordination
Number
Example
Patterns
The most common
coordination number is ____.
Another good rule of thumb is
to double the oxidation
number on the metal. For
example Ag+ often has a
coordination number of 2.
Geometry
 If coordination number is ____,
then geometry is ___________
 If coordination number is ____,
then geometry is __________,
or _____________
 If coordination number is ____,
then geometry is ___________
Ligands
O is from group 16 and has
a lone pair to donate
Must have at least one lone pair to
donate and so often come from the
following families:
What is meant by the terms monodentate, bidentate, and polydentate? What is water?
Rules for Naming Coordination Compounds
1.
__________________________________________________________________
[Co(NH3)4Cl2]Cl
“cationic complex ion” chloride
2.
K[IF6]
potassium “anionic complex ion”
__________________________________________________________________
__________________________________________________________________
[Co(NH3)4Cl2]Cl
Metal ion
named second
3.
Ligands named first,
alphabetically
Neutral ligands generally _______________________________________________
Anionic ligands _______________________________________________________
Ligand
Bromide, Chloride,
Fluoride, Iodide
Carbonate
Cyanide
Hydride
Hydroxide
Nitrite
Oxalate
Sulphide
Thiocyanate
Ammonia
Carbon monoxide
Ethylenediammine
Methylammine
Nitrogen monoxide
Pyridine
Water
Formula or Abbreviation
Br , Cl-, F-, I-
Ligand name
Bromo, Chloro, Fluoro, Iodo
CO32CNHOHNO2- or ONOC2O42S2SCNNH3
CO
NH2CH2CH2NH2 or en
CH3NH2
NO
C5H 5N
H 2O
Carbonato
Cyano
Hydrido
Hydroxo
Nitro or Nitrito
Oxalato
Thio
Thiocyanato
Ammine
Carbonyl
(Ethylenediammine)
Methylammine
Nitrosyl
Pyridine
Aqua
-
The two ligands in [Co(NH3)4Cl2]Cl would be called:
4.
_________________________________________________________________
_________________________________________________________________
The prefixes bis, tris, tetrakis, pentakis, etc are used for more complicated ligands (ones
that already contain di, tri etc or those that begin with a vowel except aqua and ammine).
When using these prefixes the name of the ligand is usually encased in brackets.
The two ethylenediammine ligands in the complex ion [Co(en)2Cl2]NO3 would be called:
5.
The oxidation state of the central metal ion is given by ________________________
__________________________________________________________________
To determine the oxidation state of the central metal ion simply use the redox rules you
have learned. For example the oxidation state of the metal ion in [Co(NH3)4Cl2]Cl is ____
6.
If the complex ion is an anion ____________________________________________
__________________________________________________________________
For example the name for K[Pt(NH3)Cl5] is __________________________________
Sometimes the Latin names are used to identify the metal in anionic complex ions .
Iron
Gold
Copper
Lead
Silver
Tin
For example, the name for Na4[FeBr6] is: __________________________________
Try These:
[Ni(H2O)4Cl2]
____________________________
[Co(NH3)6]Cl3
____________________________
___________
potassium tetrachloroplatinate(II)
___________
tetranitrosylchromium(0)
K2[Ge(C2O4)3]
____________________________
[Cr(en)3]Cl3
____________________________
___________
potassium tetracyanoaurate(III)
___________
ammonium hexachloroplumbate(IV)
[Co(NH3)5Cl]Cl2
____________________________
K3Fe(CN)6
____________________________
___________
triamminebromoplatinum(II) chloride
___________
potassium hexafluorocobaltate(III)
[Co(NH3)4(NO2)Cl]Cl
____________________________
[Fe(en)2(NO2)2]2SO4
____________________________
Silberberg p1059-1060 #47, 49, 52, 55, 57, 59, 61, 63, 65, 67, 69