chemistry-class-12-unit-09-chapter-03-coordination-compounds-l-3-5-cinzym1zhoi

<h3 id="successcoordination-compoundssuccess"><Success>Coordination compounds</Success></h3>
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<h4 id="naming-coordination-compounds">Naming coordination compounds</h4>
<ol>
<li>The cation is named before the anion</li>
</ol>
<p>In $K_3[Fe(CN)_6]$ and $[Co(NH_3)_4Cl_2]Cl$ compound, $K^+$ and $[Co(NH_3)_4Cl_2]^{+}$ cations respectively, are named first</p>
<ol start="2">
<li>
<p>Within a complex ion, the ligands are named first, in alphabetical order, and the metal ion is named last</p>
</li>
<li>
<p>The names of anionic ligands end with the letter o, whereas a neutral ligand is usually called by the name of the molecule. The exceptions are $H_2O$ (aqua), CO (carbonyl), and $NH_3$ (ammine)</p>
</li>
</ol>
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<h3 id="successcoordination-compoundssuccess-1"><Success>Coordination compounds</Success></h3>
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<h4 id="naming-coordination-compounds-1">Naming coordination compounds</h4>
<ol start="4">
<li>
<p>When several ligands of a particular kind are present: Greek prefixes di-, tri-, tetra-, penta-, and hexa- to name them. Thus, the ligands in the cation $[Co(NH_3)_4Cl_2]$ are
’tetraamminedichloro.’ If contains a Greek prefix, use the prefixes bis (2). tris (3), and tetrakis (4). e.g. bis(ethylenediamine)</p>
</li>
<li>
<p>ON of the metal ion is written in Roman numerals following the name of the metal ion. $[Cr(NH_3)_4Cl_2]^+$ , is tetraamminedichlorochromium (III) ion</p>
</li>
<li>
<p>When the complex is an anion, its name ends in -ate. The anion $[Fe(CN_6)]^+$ is called hexacyanoferrate(II) ion</p>
</li>
</ol>
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<p><img alt="image" src="https://temp-public-img-folder.s3.ap-south-1.amazonaws.com/sathee.prutor.images/subject-images/iitpal/image/chemistry-class-12-unit-09-chapter-03-coordination-compounds-l-3_5-cinzym1zhoi-05.jpg"></p>
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<h3 id="successcoordination-compoundssuccess-2"><Success>Coordination compounds</Success></h3>
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<p><strong>Question 1.</strong> Write the systematic names of the following coordination compounds: (a) $Ni(CO)_4$, (b) $NaAuF_4$ , (c) $K_3[Fe(CN)_6]$, (d) $[Cr(en)_3]Cl_3$</p>
<p><strong>(a)</strong> The CO ligands are neutral species and therefore the Ni atom bears no net charge. The compound is called tetracarbonylnickel(0)</p>
<p><strong>(b)</strong> The complex anion has a negative charge $(AuF_4^-)$. The compound is sodium tetrafluoroaurate(III)</p>
<p><strong>(c)</strong> The compound is potassium hexacyanoferrate(III)</p>
<p><strong>(d)</strong> the compound is tris(ethylenediamine)chromium(III) chloride</p>
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<h3 id="successisomerism-in-coordination-compoundssuccess-3"><Success>Isomerism in coordination compounds</Success></h3>
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<p>$Cu^{2+} \hspace{3 mm} Cu^{1+} \hspace{3 mm}CuCl^{1-}_2 \hspace{3 mm} C.N.2$</p>
<p>$M^{n+}A_2⋅nH_2O$</p>
<h4 id="coordination-isomerism">Coordination Isomerism</h4>
<ul>
<li>It arises from the interchange of ligands between cationic and anionic entities of different metal ions present in a complex</li>
<li>Such as $[Co(NH_3)_6][Cr(CN)_6]$, in which the $NH_3$, ligands are bound to $Co^{3+}$ and the $CN^-$ligands to $Cr^{3+}$</li>
</ul>
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<p><img alt="image" src="https://imagedelivery.net/YfdZ0yYuJi8R0IouXWrMsA/240eef03-41e4-42a6-37a5-b0b6982c6300/public"></p>


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### <Success>Isomerism in coordination compounds</Success>
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<h4 id="ionization-isomerism">Ionization Isomerism</h4>
<ul>
<li>It arises when the counter ion in a complex salt is itself a potential ligand and can displace a ligand which can then become the counter ion</li>
<li>An example is provided by the ionization isomers</li>
</ul>
<p>$[Co(NH_3)_5SO_4]Br$ and $[Co(NH_3)_5 Br]SO_4$</p>
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### <Success>Isomerism in coordination compounds</Success>
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<h4 id="solvate-isomerism">Solvate Isomerism</h4>
<ul>
<li>Also known as ‘hydrate isomerism’, where water is involved as a solvent. This is similar to ionization isomerism</li>
<li>Solvate isomers differ by whether or not a solvent molecule is directly bonded to the metal ion or present as solvent of crystallization in the crystal lattice</li>
</ul>
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