The cations 5Io6C1~+ and Ta6Cl~+ have related structures [1, 6] in which the metal ions are at the corners of an octahedron and the chlorine atoms are either above the faces of the octahedron a+(5 [oGCls) or above the edges (TaGCI~+). Discussions of the bondingdoi:10.1007/BF00527726S. F. A. KettleSpringer-Verl...