What is isomerism? explain different types of isomers., Chemistry

The two or more chemical compounds with identical chemical formula but different structures are called isomers, and the phenomenon is known as isomerism. This phenomenon is not restricted to carbon compounds only but is also found, though less frequently, among inorganic substances.

In co-ordination compounds, the ligands are arranged spatially in specific orientation around a given metal atom or iron. Some examples are shown below:

Several isomeric possibilities, thus, arises depending upon the position and arrangement of ligands around the metal ion. Isomers can be broadly classified into two major categories: structural isomers and stereoisomers. Each of these kinds of isomers can be further sub-divided as described below:
    
Structural isomers
    
Ionization isomers
    
Co-ordination isomers
    
Linkage isomers
    
Hydrate isomers
    
Co-ordination-position isomerism
    
Polymerization isomerism
    
Stereo isomers
    
Geometrical isomers
    
Optical isomers

Structural isomers
    
Ionization isomers: compounds which have same composition but yield different ions in solution are called ionization isomers. In this type of isomerism, there is an interchange of groups between the co-ordination sphere of the metal ion and the ions outside this sphere. Hence, the two compounds have the same formula but differ with respect to the ionic groups.

Some examples are:
                              
[Pt(NH3)4Cl2] Br2 and [Pt(NH3)4 Br2] Cl2
                              
[Co(NH3)NO3] SO4 and [Co(NH3)5 SO4] NO3
                              
[Co(NH3)4 Cl(NO2)] Cl and [Co(NH3)4 Cl2] NO2
                              
[Cr(NH3)SO4] Br and [Cr(NH3)5 Br] SO4

    
Co-ordination isomers: this type of isomerism is shown by compounds in which both cations as well as anion are complexes. Here, the isomers differ as a result of different groups being co-ordinated about a particular co-ordination centre. It is shown by the compounds in which cations as well as anion are complexes. For example,

[Co(NH3)6][Cr(CN)6] and [Cr(NH3)6][Co(CN)6]
    
Linkage isomers: this type of isomers result from two possible ways of attachment of a ligand to the central atom. For example, NO2group can bind to the metal either through nitrogen i.e. as a nitro

For example

2395_Untitled.png

Posted Date: 6/25/2012 7:15:07 AM | Location : United States







Related Discussions:- What is isomerism? explain different types of isomers., Assignment Help, Ask Question on What is isomerism? explain different types of isomers., Get Answer, Expert's Help, What is isomerism? explain different types of isomers. Discussions

Write discussion on What is isomerism? explain different types of isomers.
Your posts are moderated
Related Questions
on what basis basic radicals are separated into six groups ?

Diagonal relationship between Be and Al

If 4.5 grams of Nitrogen reacted with 2.6 grams of Hydrogen, identify the following: Limiting Reactant- Excess Reactant- and Theoretical Yield:

Q. Describe Peroxomonosulphuric Acid? It is also known as permonosulphuric acid. It is obtained by the action of chlorosulphuric acid on cold anhydrous hydrogen peroxide :

An ion has 18 electrons in the outermost shell, it is: (1)  Cu +                (2) Th 4+                             (3) Cs +                       (4) K + Ans

why pcl3 is less polar than sicl4

Octane number - Characteristics of hydrocarbons It is utilized for measuring the knocking character of fuel utilized in petrol engine.  The octane quantity of an offered sample

reason behind the diganol relationship of lithium and magnishim

Dielectric loss: These losses occur because of electrons hopping from single lattice site to another in transition metal oxides.

How is harvest maturity identified? Before harvesting, the first thing to be looked into is the identification of harvest maturity. We have already seen what the term ac