PZ1/c, with a= 15.099 (4) A, b= 15.365 (3) A, c= 14.576 (4) A, p= 108.11 (2) O, V= 3214.1 A3, and dcdcd= 1.567 g cm-3 for 2= 4. Refinement converged at R= 0.071 for 227 refined parameters and 2697 observed reflections. There is a clear halogen dependence for the geometry of the central MnzXz unit. All distances and the angle X-Mn-X increase on going from C1 to I while Mn-X-Mn* decreases. The latter effect is attributed to increasing halogen ...