It is now known that the compound commonly known as "palladium(II) cyanide" is in fact a nanocrystaline material better described using the formula Pd(CN)2.0.29H2O.

The interior of the sheets do indeed consist of square-planar palladium ions linked by head-to-tail disordered bridging cyanide groups to form 4,4-nets.

These sheets then stack with very little long range order resulting in Bragg diffraction patterns with very broad peaks.

That exchange occurs at all illustrates the ability of some compounds to be labile (fast reactions) but also stable (high formation constants).

Such associative reactions are characterized by large negative entropies of activation, in this case: -178 and -143 kJ/(mol·K) for Pd and Pt, respectively.