how does a fomula of Iron(III) and ethylenediamine, assuming a coordination number of 6 look and what is it's name?
Can't draw pictures on this forum but here is a web address.
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To determine the formula and name of the complex formed by Iron(III) and ethylenediamine with a coordination number of 6, we need to analyze the properties of individual components and their coordination.
Firstly, Iron(III) refers to the iron ion with a +3 charge. The chemical symbol for iron is Fe, and the Roman numeral (III) indicates its oxidation state.
Secondly, ethylenediamine is a bidentate ligand, meaning it can bond through two points to a central metal ion. It has the chemical formula C2H8N2 and can donate a pair of electrons from each of its nitrogen atoms to form coordination bonds.
With a coordination number of 6, the formula of the complex is [Fe(en)3]Cl3, where en represents ethylenediamine. In this complex, three ethylenediamine molecules coordinate with the central iron ion, forming a octahedral geometry around the iron ion. The coordination bonds are formed through the nitrogen atoms of ethylenediamine, resulting in a total of six coordination bonds.
Note that since the iron ion has a +3 charge, three chloride ions (Cl-) are needed to balance the charge. Hence, the complex is accompanied by three chloride ions.
As for the name, the complex is called "tris(ethylenediamine)iron(III) chloride." It reflects the presence of three ethylenediamine ligands coordinated with the iron(III) ion, and the overall compound is in its chloride form.
To determine the formula and name of a complex formed between Iron(III) and ethylenediamine, we need to consider the coordination number and the charges of the ions involved.
First, let's start with the coordination number. If the coordination number is 6, it means that six ligands surround the central Iron(III) ion. This suggests a octahedral geometry, where the ligands are arranged around the central ion in a symmetrical manner.
Next, let's determine the charges of the ions involved. Iron(III) has a charge of +3 (Fe^3+), while ethylenediamine is neutral (since it is a ligand).
Since the overall complex is neutral (just like ethylenediamine), we know that the sum of the charges of all the ligands and the central ion must equal zero.
With a coordination number of 6, there are two possible ways in which ethylenediamine can coordinate to Iron(III). It can either act as a bidentate ligand (donating two lone pairs of electrons) or as a monodentate ligand (donating only one lone pair of electrons).
1. If ethylenediamine acts as a bidentate ligand, then two of its lone pairs would coordinate with the central iron ion. In this case, we would need three ethylenediamine ligands to satisfy the coordination number of 6. The resulting complex would have a formula of [Fe(en)₃]³⁺, where (en) represents ethylenediamine.
2. If ethylenediamine acts as a monodentate ligand, then only one of its lone pairs would coordinate with the central iron ion. In this case, we would need six ethylenediamine ligands to satisfy the coordination number of 6. The resulting complex would have a formula of [Fe(en)₆]³⁺.
Now, talking about the names:
1. [Fe(en)₃]³⁺: This complex is called "Iron(III) triethylenediamine". The prefix "tri-" indicates that there are three ethylenediamine ligands coordinated to the central iron ion.
2. [Fe(en)₆]³⁺: This complex is called "Hexaammineiron(III)". The prefix "hexa-" indicates that there are six ethylenediamine ligands coordinated to the central iron ion, and the "ammine" part refers to ethylenediamine being a derivative of ammonia.