Respuesta :
We have to get the formula of the complex formed between Fe³⁺ and ethylenediamine.
The formula of the complex is: [Fe(en)₃]³⁺, where, en is abbreviation of ethylenediamine.
Ethylenediamine (en) is a bidentate ligand as it contains two donating sites (-NH₂ groups). Three ethylenediamine co-ordinate to central metal ion, Fe³⁺ and forms [Fe(en)₃]³⁺ with a co-ordination number of six.
Answer: The formula of the complex will be [tex][Fe(NH_2CH_2CH_2NH_2)_3]^{3+}\text{ or }[Fe(en)_3]^{3+}[/tex]
Explanation:
Coordination number in a complex is defined as the number of ligands that are attached to the central metal atom.
- If the ligand is unidentate, it will occupy 1 place around the central metal atom.
- If the ligand is bidentate, it will occupy 2 places around the central metal atom.
- If the ligand is tridentate, it will occupy 3 places around the central metal atom.
We are given:
A metal ion having formula [tex]Fe^{3+}[/tex] and ligand attached to it is ethylenediamine (shortly named as 'en')
Coordination number of the complex is 6
We know that, 'en' is a bidentate ligand and does not carry any charge on it
Hence, the formula of the complex will be [tex][Fe(NH_2CH_2CH_2NH_2)_3]^{3+}\text{ or }[Fe(en)_3]^{3+}[/tex]
