Name the following compounds by IUPAC system :
1. [ Cr (NH3)3 Cl3] 2. Na4[Fe (CN)6 ]
3. Fe4[Fe (CN)6]3 4. [Ag(NH3)2] OH
5. [Cr(NH2-Ch2-ch2-NH2)3]cl3
I would name the the second one as
sodium hexacyanoferrate(II)
Here is a site that gives the rules for naming the others.
http://www.chemguide.co.uk/inorganic/complexions/names.html
Sure! I'll explain how to name each compound using the IUPAC (International Union of Pure and Applied Chemistry) system.
1. [Cr(NH3)3Cl3]
To name this compound, start by identifying the central atom, which is Cr (chromium). Next, identify the ligands (NH3 and Cl) surrounding the central atom. Since there are three NH3 ligands, we use the prefix "tri-" in the name. Similarly, since there are three Cl ligands, we use the prefix "tri-" for them as well. The complete name is therefore: tris(ammine)trichlorochromium(III).
2. Na4[Fe(CN)6]
In this compound, the central atom is Fe (iron), and it is surrounded by six CN ligands (cyanides). We use the prefix "hexa-" to indicate six ligands. Since Na (sodium) is present as a separate ion, we don't include it in the name of the compound. The name for this compound is: hexacyanidoferrate(II) or hexacyanoferrate(II) sodium.
3. Fe4[Fe(CN)6]3
Here, the central atom is again Fe (iron), and it is surrounded by six CN ligands. The prefix "hexa-" is used. However, the compound also contains the Fe4 group. To name the whole compound, we include both parts. The name is: tetrairon(III) tris(hexacyanoferrate(II)).
4. [Ag(NH3)2]OH
In this compound, the central metal is Ag (silver), which is coordinated with two NH3 ligands. We use the prefix "di-" to indicate two ligands. The compound also has an OH group as a separate ion. Since NH3 is a weak base, it is named as ammine, and OH is named hydroxide. The complete name of this compound is: diammine silver hydroxide.
5. [Cr(NH2-CH2-CH2-NH2)3]Cl3
In this compound, the central metal is Cr (chromium), which is coordinated with three ligands NH2-CH2-CH2-NH2 (ethylenediamine). Since there are three ethylenediamine ligands, we use the prefix "tri-". The compound is further coordinated with three Cl ligands. The complete name is: tris(ethylenediamine)chromium(III) trichloride.
Remember, the IUPAC naming system can be complex, but by identifying the central atom, ligands, and their prefixes, you can construct the name for coordination compounds effectively.