info@urfaculty.com

www.urfaculty.com

Govt. Job/ Sarkari Naukri, NEET, CAT, Bank Exam & Study materials

Thursday, 23 February 2017

Co-ordination Compounds - III


Isomers:
  • Two or more compounds which have same chemical formula but different arrangement of atoms are called isomers.
Types of isomerism:
Structural isomerism
  • Linkage isomerism
  • Solvate isomerism or hydrate isomerism
  • Ionisation isomerism
  • Coordination isomerism
Stereoisomerism
  • Geometrical isomerism
  • Optical isomerism
Structural isomerism:
  • It arises due to the difference in structures of coordination compounds.
  • Structural isomerism, or constitutional isomerism, is a form of isomerism in which molecules with the same molecular formula have atoms bonded together in different orders.
Ionisation isomerism:
  • 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.
  • Example: [Co(NH3)5Br] SO4 and [Co(NH3)5 SO4] Br
Solvate isomerism:
  • It is isomerism in which solvent is involved as ligand.
  • If solvent is water it is called hydrate isomerism, e.g., [Cr(H2O)6]Cl3 and [CrCl2(H2O)4] Cl2. 2H2O.
Linkage isomerism:
  • It arises in a coordination compound containing ambidentate ligand.
  • In the isomerism, a ligand can form linkage with metal through different atoms.
  • Example: [Co(NH3)5ONO]Cl2 and [Co(NH3)5NO2]Cl2.
Coordination isomerism:
  • This type of isomerism arises from the interchange of ligands between cationic and anionic entities of different metal ions present in a complex.
  • Example: [Co(NH3)6][Cr(C2O4)3] and [Cr(NH3)6][Co(C2O4)3].
Stereoisomerism:
  • This type of isomerism arises because of different spatial arrangement.
Geometrical isomerism:
  • It arises in heteroleptic complexes due to different possible geometrical arrangements of ligands.
Optical isomerism:
  • Optical isomers are those isomers which are non-superimposable mirror images.
Valence bond theory:
  • According to this theory, the metal atom or ion under the influence of ligands can use its (n-1)d, ns, np or ns, np, nd orbitals for hybridisation to yield a set of equivalent orbitals of definite geometry such as octahedral, tetrahedral, and square planar.
  • These hybridised orbitals are allowed to overlap with ligand orbitals that can donate electron pairs for bonding
Click here to view complete Chemistry Free Study Materials and Notes for NEET Preparation

Click here to view complete Physics Free Study Materials and Notes for NEET Preparation

Click here to view complete Biology Free Study Materials and Notes for NEET Preparation

Click here to take NEET online practice tests by UrFaculty.com

No comments:
Write comments

Hey, we've just updated our test package. Check'it out here - https://goo.gl/r7FuPT
Join Youth Apps