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coordination number
Molecular formula :
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nature : Coordination compounds directly and central atom (or ion) linked to the distribution of the number of atoms. The median can be allocated from 2 to 12, up to 14 individual. The most common allocation median 4 and 6, followed by 2 and 5. 9-12 high distribution median little coordination compounds, mainly by the lanthanide elements and actinides form. The median allocation depends on the central atom radius, charge, electronic structure and ligand complex nature of many factors. The following table shows the distribution by the median 2-8 Coordination compounds (or complex-ion) and the corresponding example of the geometry :
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distribution median example geometry
2 MainGridText align = [Ag (NH3) 2] k < up> + / sup>, HgCl2 linear
3 MainGridText align = Pt (PPh3) 3 planar triangles
4 AlE-4, Ni (CO) 4 tetrahedral
MainGridText align = [Cu (NH3) 4] < 2 + / su

k

planar square
5 CuCl3-5, Fe (CO) 5_ s biconical
MnCl2-5, [Co (CN)) 5 ]) 3- Quartet cone
6 MainGridText align = [Cr (C2O4 ) 3] 3-, [Pt (NH3) 4Cl2] < 2 + / su

k

octahedral
7 MainGridText align = [V (CN) 7]]] 4-. ReF7 biconical
MainGridText align = [W (CO) 4Br3] -< / sup> single cap octahedral
8 MainGridText align = Ti (NO3) 4 [Zr (C2Os _4) 4] 4- MainGridText align = 12 surface-
MainGridText align = [W (CN ) 8] 4-, [U (NCS) 8] 4- Quartet-prism



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1) coordination number
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