Question

Write the sum of geometrical isomer in$\left[{\mathrm{Ma}}_2{\mathrm{b}}_2{\mathrm{c}}_2\right]$ complex and stereoisomers in $\left[\mathrm{M}{\left(\mathrm{AB}\right)}_3\right]$ complex

Answer 1

Fac and mer isomers:

• Meridional is referred to as Mer, while facial is fac.
• In the mer isomer, the identical ligands are on a plane that bisects the polyhedron, whereas, in the fac-isomer, they are on a common face of a polyhedral complex.
• Although not exclusive to octahedral complexes, this sort of isomerism is highly common in them.

Cis and trans isomers:

• Alkanes, alkenes, and organic and inorganic compounds all exhibit cis and trans isomerism.
• When two comparable atoms are on the same side of a double bond in a molecule, they are said to be in a "cis" isomer.
• Trans isomers, on the other hand, are made up of molecules with two identical atoms positioned on either side of a double bond.
• Although cis and trans isomers share the same molecular weight and formula, there are several recognized differences between them.

Step 1: Geometrical isomer in$\left[{\mathrm{Ma}}_2{\mathrm{b}}_2{\mathrm{c}}_2\right]$:

• Geometric isomers are coordination compounds that have the same number and type of atoms and bonds.
• Geometric isomers in$\left[{\mathrm{Ma}}_2{\mathrm{b}}_2{\mathrm{c}}_2\right]$:

• So geometrical isomers present are = $5$

Step 2: Stereoisomers in $\left[\mathrm{M}{\left(\mathrm{AB}\right)}_3\right]$

• Stereoisomers are isomers with the same composition (that is, the identical parts) but different orientations in space
• Stereoisomers in $\left[\mathrm{M}{\left(\mathrm{AB}\right)}_3\right]$ are mer and fac and their mirror images:

• So stereoisomers present are = $4$

Step 3: sum of geometrical isomer in$\left[{\mathrm{Ma}}_2{\mathrm{b}}_2{\mathrm{c}}_2\right]$ complex and stereoisomers in $\left[\mathrm{M}{\left(\mathrm{AB}\right)}_3\right]$ complex

$5+4=9$