Controlling Cu center dot center dot center dot Cu distances using halides: (8-phenylthionaphth-1-yl)diphenylphosphine copper halide dimers

In the isomorphous binuclear Cu2X2L2 systems (L = (8-phenylthionaphth-1-yl)diphenylphosphine the Cu center dot center dot center dot Cu separation is reduced as the halide size increases.