Coordination Number 2
The linear [Ag(NH3)2]+ ion
Although [Ag(en)]ClO4 involves a normally bidentate
ligand, in this case the structure is polymeric and the silver
ion still retains a CN=2 with the N atoms (from different ligands)
at ~180 degrees to each other.
Coordination Number 3
Trigonal planar - D3h
[Cu(CN)3]2-
[CuBr(PNP)] where PNP= (2,6-bis[(di-tert-butylphosphino)methyl]pyridine)
To help view more easily, the H atoms are turned off.
Trigonal pyramid
T-shaped
[Cu(PNP)]SbF6 where PNP= (2,6-bis[(di-tert-butylphosphino)methyl]pyridine)
To help view more easily, the H atoms are turned off.
Coordination Number 4
Tetrahedral
CoCl2pyr2
Square Planar
cisplatin - cis-PtCl2(NH3)2
The cis- isomer is a powerful anti-cancer drug whereas
the trans- is inactive.
Coordination Number 5
Square pyramid
Trigonal Bipyramid
[Ni(CN)5]3-
Coordination Number 6
Hexagonal planar
Trigonal prism
tris(cis-1,2-diphenylethene-1,2-dithiolato)rhenium
The ReS6 geometry is perfectly trigonal prismatic.
Octahedral
Hexol
The first 'truly' inorganic complex to be resolved into its
optical isomers.
[Co(en)3]Cl3
The classic example of optical isomerism in octahedral
coordination complexes (H atoms not shown).
D isomer
L isomer
[CoCO3(NH3)5]+
Coordination Number 7
Capped octahedron (C3v)
K3[NbOF6]
Capped trigonal prism (C2v)
[V(III)(Hedta)(H2O)]H2O
Pentagonal Bipyramid (D5h)
bis-(tert-butylacac)2(DMSO)di-oxoUranium
The UO7 geometry fits a pentagonal bipyramid.
Coordination Number 8
Dodecahedron (D2d)
[Zr(acac)2(NO3)2]
[Zr(C2O4)4]4-
is reported to have this shape as well.
Cube (Oh)
Square antiprism (D4d)
U(acac)4
Hexagonal bipyramid (D6h)
UO2(OAc)3
Coordination Number 9
Three-face centred trigonal prism (D3h)
Hydrated salts of the lanthanide elements eg
Eu(H2O)9]3+
Coordination Number 10
Bicapped square antiprism (D4d)
Tetrakis(nitrato-O,O')-bis(triphenylphosphine oxide) cerium(IV)
Another example is
[Ce(NO3)5]2-
Coordination Number 11
All-faced capped trigonal prism (D3h)
This is not a common stereochemistry.
In aqua-(12-crown-4)-tris(nitrato-O,O')-cerium(III) (12-crown-4) solvate
and (15-crown-5)-tris(nitrato-O,O')-cerium(III) the Cerium ion is 11 coordinate.
Coordination Number 12
cuboctahedron (Oh)
Ceric ammonium nitrate
-(NH4)2Ce(NO3)6
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Lancashire, all rights reserved.
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Prof. Robert J.
Lancashire,
The Department of Chemistry, University of the West Indies,
Mona Campus, Kingston 7, Jamaica.
Created March 1996. Links checked and/or last modified
9th March 2015.
URL
http://wwwchem.uwimona.edu.jm/courses/IC10Kcnpics.html