text: Many C-symmetric complexes are known.  Some arise not from C-symmetric ligands, but from the orientation or disposition of high symmetry ligands within the coordination sphere of the metal.  Notably, EDTA and triethylenetetraamine form complexes that are C-symmetric by virtue of the way the ligands wrap around the metal centers.  Two isomers are possible for (indenyl)MX, C- and C-symmetric.  The C-symmetric complexes are optically stable.