Q134P - Chemistry: Molecular Nature Of Matter And Change

Question

Several coordination isomers have the molecular formula${\text{Pt}}_2{\text{H}}_{12}{\text{Cl}}_6{\text{N}}_4$ . 

(a) Give the name and standard formula of the isomer in which the $Pt$ complex ion has six $\text{Cl}$ groups and a charge of $2-$ . 

(b) Give the name and standard formula of the isomer in which the $2 -$Pt complex ion has four  groups and a charge of 

 

Step-by-Step Solution

Answer

$$\begin{gathered} \left(a\right) \\ heme F{e}^{2^{+}} \\ chlorophyll M{g}^{2^{+}} \\ vitamine B_{12} C{o}^{2^{+}} \\ vitamine{B}_{12 }C{o}^{2^{+}} \end{gathered}$$

(b)  All compounds have a metal ion with oxidation state of $+ 2$, all compounds also have one polydentate ligand each with Nitrogen as the donor atom and are attached through 4 donor atoms. Each metal is also enclosed in the cyclical ligands.

Step 1: Given information

 Several coordination isomers have the molecular formula${\text{Pt}}_2{\text{H}}_{12}{\text{Cl}}_6{\text{N}}_4$ . 

Step 2: Oxidation state

The oxidation number, or number, is that the hypothetical charge of an atom if all of its bonds to different atoms were fully ionic.

Step 3: Name and standard formula

(a) 

 

The structures of heme, chlorophyll and vitamin $B_{12}$are coordinate complexes which have large organic molecules as ligands. The table below shows the corresponding central metal atom of each compound.

$$\begin{gathered} heme F{e}^{2^{+}} \\ chlorophyll M{g}^{2^{+}} \\ vitamin B_{12} C{o}^{2^{+}} \end{gathered}$$

Step 4: Name and standard formula

(b) 

 All three compounds have large organic compounds attached as ligands. Each complex is composed of a metal ion with a polydentate ligand attached to it through 4 donor atoms. The donor atom for these ligands is also similar, they are all Nitrogen atoms that attach to the metal ion, and enclosing the metal ion in a cyclical compound. Lastly, the oxidation state of each metal ion is similar. They all have +2 oxidation states.