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[Pt(NH3)4Cl2]Br2 and [Pt(NH3)4Br2]Cl2 is a type of


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Cordinanation compounds:

  • A coordination complex may be defined as a compound that results from the combination of two or more stable chemical species and retains its identity in the solid as well as the dissolved state.
  • The cation to which one or more neutral molecules or ions are coordinated is called the central ion.
  • The molecules or ions so attached are called ligands.
  • The atom in the ligand which can donate the electron pair is called the donor atom.
  • The total number of ligands attached to a central ion is called the coordination number of that ion.
  • The central ion together with molecules or ions coordinated to it constitutes what is termed a coordination complex.

Isomerism in coordination compounds:

  • The compounds having the same molecular formula but different structures and hence different physical and chemical properties are called isomers.
  • The phenomenon of the existence of such compounds is known as isomerism.
  • Isomerism in coordination compounds may be divided into two main types, Structural isomerism, and Stereo isomerism.
  • Structural isomerism is in five types Ionisation isomerism, Hydrate isomerism, Coordination isomerism, Linkage isomerism, and coordination position isomerism.
  • In ionization isomerism, the difference arises from the positions of groups within or outside the coordination sphere. therefore these isomers give different ions in the solution.
  • In Hydrate isomerism, arises from the replacement of a coordinated group with water of hydration.
  • The coordination isomerism is observed in the case of compounds comprising of both cationic and anionic complexes.
  • In linkage isomerism, there are two atoms that can donate their lone pairs, for example, in NO2-the Nitrogen atom as well as the Oxygen atom can donate their lone pairs. If Nitrogen donates its lone pair, one particular compound will be formed. If Oxygen does a different compound is obtained.
  • Coordination position isomerism is exhibited by bridged complexes and results from the different placement of ligands.
  • Stereo isomerism is in two types Geometric isomerism and Optical isomerism.
  • In geometric isomerism, the atoms have different spatial arrangements, and it is also known as cis-trans isomerism.
  • In optical isomerism, are certain substances that can rotate the plane of polarised light, and the optically active isomers of a compound that rotate the plane of polarised light equally but in opposite directions are called enantiomers.

[Pt(NH3)4Cl2]Br2 and [Pt(NH3)4Br2]Cl2

  • [Pt(NH3)4Cl2]Br2 and [Pt(NH3)4Br2]Cl2 is a type of ionization isomer.
  • Here, the difference arises from the positions of groups within or outside the coordination sphere. therefore these isomers give different ions in the solution.

[Pt(NH3)4Cl2]Br2Tetraaminebischloridoplatinum(IV)bromide[Pt(NH3)4Cl2]Tetraaminebischloridoplatinum(IV)ion2++2BrBromineion

[Pt(NH3)4Br2]Cl2Tetraaminebisbromidoplatinum(IV)chloride[Pt(NH3)4Br2]2+Tetraaminebisbromidoplatinum(IV)ion+2ClChlorineion


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