Ideal octahedral [Rh(SCN)₄Br₂]³⁻ permits each SCN⁻ to bind through N or S. Treat the donor modes as achiral monodentate ligands. Count ALL linkage-and-geometrical forms, counting enantiomers separatel

Question

Ideal octahedral [Rh(SCN)₄Br₂]³⁻ permits each SCN⁻ to bind through N or S. Treat the donor modes as achiral monodentate ligands. Count ALL linkage-and-geometrical forms, counting enantiomers separately and ignoring ligand conformations.

TestHub · Accepted Answer

Classify by k, the number of N-bound ligands. For k = 0 or 4 the form Ma₄b₂ gives two each. For k = 1 or 3 the form Ma₃b₂c gives three each. For k = 2, Ma₂b₂c₂ gives five geometrical forms; its all-cis arrangement is an enantiomeric pair, giving six stereoisomers. Total = 2+3+6+3+2 = 16. Counting linkage compositions alone or merging the chiral pair gives a wrong total.

Chemistry - Coordination Chemistry Question with Solution | TestHub

Options:

Doubts & Discussion