module-24-3-100411103637-phpapp01

module-24-3-100411103637-phpapp01 - Module – 24.3...

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Unformatted text preview: Module – 24.3 Isomerism Two or more substances having the same molecular formula but different structural or spatial arrangement are called isomers. They are of two types. a. Structural isomerism b. Stereo isomerism a. Structural isomerism: Two or more complexes have same molecular composition, but different properties are known as isomerism. Those are called as isomers. The isomers differ in the arrangement of ligands within the complest are called structural isomers and the phenomenon is called structural isomerism. 1. Ionization isomerism: This is due to difference in ionisable groups. Example: i) [Co(NH 3 ) 5 Cl]SO 4 and [Co(NH 3 ) 5 SO 4 ]Cl ii) [Pt(NH 3 ) 4 Cl 2 ]Br 2 and [Pt(NH 3 ) 4 Br 2 ]Cl 2 2. Polymerization isomerism: Compounds having the same emperial formula, but different molecular weights. Example: [Pt(NH 3 ) 2 Cl] and [Pt(NH 3 ) 4 ][PtCl 4 ] 3. Hydrate isomerism: Isomerism differing in the number of water molecules attached the metal ion as ligands in coordination sphere Example: [Cr(H 2 O) 6 ]Cl 3 and [Cr(H 2 O) 5 Cl]Cl 2 H 2 O Violet Green 4. Linkage isomerism: Isomers of this type have di mental ion. Example: [Co(NH 3 ) 5 (NO 2 )]Cl 5. Coordination isomerism This isomerism caudes by th ions. Example: [Co(NH 3 ) 6 ][Cr(CN) 6. Ligand isomerism: Some ligands capable of exi Stereo isomerism in comple Two or more complexes hav arrangement of atoms (or) g It is of two types. a. Geometrical isomerism b. Optical isomerism Stereo isomerism in coordi ifferent kinds of linkages of a ligand to th 2 and [Co(NH 3 ) 5 CoNO]Cl 2 : he interchange of ligands between the tw 6 ] and [Cr(NH 3 ) 6 ][Co(CN) 6 ] isting isomerism can give different isome lex compounds: ving same molecular composition but dif groups in space is called as stereo isomer ination number 6 compounds: e central wo complex eric complexes. fferent in rism. The arrangement of six liga different ways. Those are re If the complex Ma 4 b 2 has he corresponding to (1, 2), (1, 3 arrangement can give only t coordination number 6 com isomers of Ma 4 b 2 type. Henc structure. 1. No isomerism is possible Example: [Co(NH 3 ) 6 ] 3+ ; [ 2. In [Ma 4 b 2 ] and [Ma 4 bc] t and trans isomers....
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This note was uploaded on 04/05/2011 for the course BIOL 2112 taught by Professor Deidra during the Spring '11 term at CSU Sacramento.

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module-24-3-100411103637-phpapp01 - Module – 24.3...

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