Symmetry properties of chemical graphs. VI. Isomerizations of octahedral complexes

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Abstract
Isomerization of octahedral complexesXY6, by a mechanism known as diagonal twist (in which two ligands incispositions, one to another, exchange sites) is considered. Construction of the corresponding isomerization graph is outlined (reported before by Balaban) and the problem of determining its symmetry is considered. Alternative routes for deducing the order of the automorphism group are described. The group is confirmed to beS6and representative symmetry permutations (one for each of the 11 classes ofS6) are shown. Alternative pictorial representations of the 15‐vertex graph are also shown.