Identifying Diastereoisomers for Square Planar and Octahedral Complexes Platinum(II) forms square planar complexes, and platinum(IV) gives octahedral complexes. How many diastereoisomers are possible for each of the following complexes? Draw their structures. (a) [Pt(NH3)3Cl]^+ (b) [Pt(NH3)Cl5]^-

Question

Identifying Diastereoisomers for Square Planar and Octahedral Complexes

Platinum(II) forms square planar complexes, and platinum(IV) gives octahedral complexes. How many diastereoisomers are possible for each of the following complexes? Draw their structures.

(a) [latex] [Pt(NH_3)_3Cl]^+[/latex]

(b) [latex] [Pt(NH_3)Cl_5]^-[/latex]

(c) [latex]Pt(NH_3)_2Cl(NO_2)[/latex]

(d) [latex] [Pt(NH_3)_4ClBr]^{2+}[/latex]

STRATEGY

Recall that cis and trans isomers are possible for square planar complexes of the type [latex]MA_2B_2[/latex] and [latex]MA_2BC[/latex] and for octahedral complexes of the type [latex]MA_4B_2[/latex] and [latex]MA_4BC[/latex]. Cis and trans isomers are not possible when only one ligand differs from the others, as in complexes of the type [latex]MA_3B[/latex] and [latex]MA_5B[/latex].

Accepted Answer

(a) No isomers are possible for [latex] [Pt(NH_3)_3Cl]^+[/latex], a square planar complex of the type [latex]MA_3B[/latex]. (first photo below)

(b) No isomers are possible for [latex] [Pt(NH_3)Cl_5]^-[/latex], an octahedral complex of the type [latex]MA_5B[/latex]. (second photo below)

(c) Cis and trans isomers are possible for [latex]Pt(NH_3)_2Cl(NO_2)[/latex], a square planar complex of the type [latex]MA_2BC[/latex]. The [latex]Cl^-[/latex] and [latex]NO_2^-[/latex] ligands can be on either adjacent or opposite corners of the square. (the third photo below)

(d) Cis and trans isomers are possible for [latex] [Pt(NH_3)_4ClBr]^{2+}[/latex], an octahedral complex of the type [latex]MA_4BC[/latex]. The [latex]Cl^-[/latex] and [latex]Br^-[/latex] ligands can be on either adjacent or opposite corners of the octahedron. (the fourth photo below)

Question 20.6: Identifying Diastereoisomers for Square Planar and Octahedra......

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