The octahedral complex $[M (AB) X_{2} c X_{2}]$ contains two identical unsymmetrical bidentate ligands AB (each with two different donor atoms A and B) and two identical monodentate ligands c. Find the total number of stereoisomers (geometrical plus optical), as an integer.

Numerical answer type, tolerance 0.5.

Answer: 8

Enumerating all arrangements of the donor atoms on an octahedron and merging those related by rotation gives 5 distinct geometrical arrangements. Of these, 3 are chiral and occur as enantiomer pairs while 2 are achiral. Total stereoisomers

= 3 \times 2 + 2 = 8

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