Naming monodentate ligand complexes

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In the discussion about naming monodentate ligand complexes, a key point of confusion arises between the fac and mer isomers in a Ma3b3 structure. The fac isomer has ligands occupying one face of the octahedron, while the mer isomer has ligands arranged in a meridian position. The textbook claims that the fac is equivalent to cis, but the teacher's notes contradict this by suggesting the opposite. This discrepancy highlights the need for clarity in nomenclature, as different sources may present conflicting information. Understanding these distinctions is crucial for accurate naming of coordination complexes.
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Hi guys, i know how to name monodentate ligand complexes but there is a particular one that my textbook and teacher's notes is quite the opposite, its regarding the fac and mer isomer.

for a Ma3b3 structure,

a fac forms a face and a mer have the ligands in meridian position, but for these two, which are the cis and which are the fac? My textbook says, fac is equivalent to cis but my teacher's notes says the opposite, help please?
 
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