Isomerism geometrical enantiomorphic

Geometrical isomerism Geometrical isomerism is possible only in hexacoordinate complexes and in the case of 2 1 metal, e.g. chromium and cobalt, complexes arises from coordination of the ligand in a meridional (81) or a facial (82) mode in an octahedral complex. In the former case only an enantiomorphic pair of isomers is possible, but in the latter the possibility exists of four enantiomorphic pairs and a centrosymmetric isomer (Figure 1). 

In addition to the isomer with the structure XS-SX (which is enantiomorphic) a topological isomer S—SX2 is possible. S2F2 exhibits this type of isomerism. Both isomers are formed when a mixture of dry AgF and S is heated in a glass vessel in vacuo to 120°C. The isomer S=SF2 is pyramidal and very similar geometrically... 

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