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25 March, 05:25

What is the coordination number for each of the following complexes? A) [Fe (gly) 2 (H2O) 2]+B) [Pb (EDTA) ]2-C) [Pt (NH3) 4]2+D) Na[Au (CN) 2]

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  1. 25 March, 09:04
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    A) 6

    B) 6

    C) 4

    E) 1

    Explanation:

    Coordination number, also called Ligancy, the number of atoms, ions, or molecules bound to the metal atom in a complex ion

    A) [Fe (gly) 2 (H2O) 2]

    Gly = the aminoacid glycin, and works as a bidentate ligand, Bidentate ligands bind through two donor sites. Bidentate means "two-toothed". It can bind to a metal via two donor atoms at once.

    This makes the coordination number = 6

    B) [Pb (EDTA) ]2

    EDTA is a hexadentate ligand and forms very stable complexes.

    EDTA forms 6 bonds to the Pb atom (2 Pb-N bonds and 4 Pb-O bonds). The coordination number = 6.

    C) [Pt (NH3) 4]2+

    It's a squareplanar complex with coordination number = 4 because 4 bindings with NH3

    D) Na[Au (CN) 2]

    Cyanide binds only to 1 Au - atom. The coordination number = 1
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