Coordination Compounds

Concept:The total isomers arise from two types of isomerism: geometrical isomerism due to the ambidentate nature of glycinate ($\mathrm{gly}$) and linkage isomerism of the ligands $\mathrm{NO}_2$ and $\mathrm{NCS}$.Explanation:Glycinate ($\mathrm{NH_2CH_2COO^-}$) is a bidentate ligand that can coordinate through either its nitrogen atom or oxygen atom. This gives two possible geometrical arrangements in a square planar complex.For each geometrical isomer, the $\mathrm{NO}_2$ ligand can bind through the nitrogen ($\rightarrow$ nitro) or through an oxygen ($\rightarrow$ nitrito), providing 2 linkage possibilities.Similarly, the $\mathrm{NCS}$ ligand can bind through nitrogen ($\rightarrow$ isothiocyanato) or through sulfur ($\rightarrow$ thiocyanato), giving another 2 linkage possibilities.Thus, total number of isomers = (geometrical isomers) × (linkage isomers of $\mathrm{NO}_2$) × (linkage isomers of $\mathrm{NCS}$) = $2 \times 2 \times 2 = 8$.Answer:$8$