Determine the unknown quantity: a. The hapticity of the lower ring in the mixed sup...

Determine the unknown quantity:

a. The hapticity of the lower ring in the mixed superphane (See S. Gath, R. Gleiter, F. Rominger, C. Bleiholder, Organometallics, 2007, 26, 644. Structure generated with CIF data, with hydrogen atoms omitted for clarity.)

b. The third row 16-electron transition metal M on the left and the first row 16-electron transition metal M′ on the right (See M. Tamm, A. Kunst, T. Bannenberg, S. Randoll, P. G. Jones, Organometallics 2007, 26, 417.)