Researches on Dichroism of Planar Complexes. III. The Color and the Structure of the Crystals of Tetracyanoplatinates (II)

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Abstract
The dichroism of crystals of BaPt(CN)4·4H2O, CaPt(CN)4·5H2O and MgPt(CN)4·7H2O has been measured in the visible and the near-ultraviolet region, and with the aid of results of this measurement, the state of the complex ions in the crystals has been, discussed in relation to their crystal structures. These crystals show similar dichroism, with the characteristic sharp absorption band for //-absorption. It has been concluded that be-ween adjacent tetragonal complex ions piled upon one another along the c-axis in these crystals there exists a sort of direct interaction, which is supposed to be related to the unusual colors of these compounds. It has been found that as the distance between platinums decreases in the order of Ca, Ba and Mg salts, the interaction between platinum ions becomes stronger, and that the characteristic band becomes sharper and is displaced towards longer wave-length. The interaction in these crystals is regarded as more remarkable than that in Magnus’ salt.

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