Chapter 20, Problem 20.127CHP

Interpretation Introduction

Interpretation:

The possible isomers for given octahedral complex ${\left[Nb{X}_{2}C{l}_4\right]}^{-}\left(X^{-}=NC{S}^{-}\right)$ should be drawn and the linkage isomers should be identified.

Concept Introduction:

Isomerism: Two chemical compounds are said to be isomers if they have same number and kind of atoms but different only in their orientation that is structural arrangements.

• Structural or Constitutional isomers: Have same molecular formula but different bonding arrangements of atoms. It is further classified as Linkage and Ionization isomers.
• Stereoisomers: Differ in their spatial arrangement of atoms.

Linkage isomers: The metal bond to ligand via either of two different donor atoms present in ligand. E.g. ${\left[Co{\left(N{H}_3\right)}_5\left(N{O}_2\right)\right]}^{2+}and{\left[Co{\left(N{H}_3\right)}_5\left(ONO\right)\right]}^{2+}$

There are different types of isomerism in which geometric is of one type where the rotation around the atom is restricted like in cis-trans configuration. This is also refereed as cis-trans isomerism.

Diastereoisomers: The stereo isomers of one compound which are not mirror images with each other are referred as diastereoisomers.