A complex of correctly written formula [Pt(NH₃)₃Br]Br ∙ H₂O has which set of ligands in its inner coordination sphere? A)3 NH₃ B)3 NH₃ and 2 Br^- C)3 NH₃ and 1 Br^- D)3 NH₃, 1 Br^-, and 1 H₂O E)3 NH₃, 2 Br^-, and 1 H₂O

Question

Quizplus · Accepted Answer

The complex has one central Pt atom that is coordinated by four ligands. The two Br atoms are located outside of the inner coordination sphere. The abbreviation NH₃ stands for a bidentate ligand with a nitrogen donor (N), a sulfur donor (S), and a urea linker (H₃). Therefore, there are three NH₃ ligands which binds to the Pt atom through two donor atoms. The formula also includes the abbreviation H₂O, which stands for a monodentate ligand with a sulfur donor (S) and an alcohol linker (H₂O). This ligand is not part of the inner coordination sphere, but it is included in the formula as a solvate or counter-ion. Therefore, the correct choice is C, which lists three NH₃ ligands and one Br^- ligand, without including the solvate.

A Complex of Correctly Written Formula [Pt(NH3)3Br]Br ∙ H2O Has

A Complex of Correctly Written Formula [Pt(NH₃)₃Br]Br ∙ H₂O Has