Download Coordination Compounds

Coordination
Compounds
Colorful world of transition metals
[Co(NH3)5Cl]Cl2
• Complex ion: can be cation or anion; contains the
transition metal and usually is in brackets.
• Ligands: neutral molecule or ion having a lone pair
of electrons that forms a coordinate covalent bond
to a metal ion; usually dissociate when aqueous.
Ligands in the spectrochemical series show which
ones can replace others.
[Co(NH3)5Cl]Cl2
• Counter ion: anion or cation needed to make
complex ion neutral. Use it to find variable charges
of transition metals
• Oxidation Number: (primary valence), refers to the
ability to form ionic bonds with anions
[Co(NH3)5Cl]Cl2
• Coordination number
(secondary valence):
refers to number of
bonds formed
between the metal ion
& ligands in complex
ion.
Ligands
• Mono/unidentate: one
attachment site
• Bidentate: two
attachment sites
(unbonded pair of
electrons)
• Polydentate: multiple
attachment sites; EDTA,
dien
Nomenclature
[Ir(NH3)4(H2O)2](NO3)3
• Determine oxidation #
of metal
• Ligands are named
first, alphabetically with
prefixes: mono-, di-, tri-,
tetra-, penta-, hexa-.
Prefixes DO NOT affect
order.
• Anion ligands end in
“o” chloro, fluoro
• First name end with
metal + variable
charge (romans #s)
• Second name =
counter ions/anion
• If complex ion is anion
the ending changes to
the Latin name and –
ate suffix
Name, coordination # and
oxidation #
• K4[Fe(CN)6]
• Na[PtCl3(NH3)]
• Dichloroethylenediamminecadmium
• Tris(en)cobalt (III) tris (oxalato)ferrate