Platinum complexes dichroic

The compound is a dark red-purple dichroic cystalline material. In time, the crystals develop a thin coating of sulfur. The rhodium(III) complex, which appears to be structurally similar to the platinum(IV) compound, shows much greater reactivity in that sulfur is readily lost on dissolving in water, dimethyl-formamide, or pyridine. From water, a product may be precipitated which appears to contain the [RhSi0] anion. Reaction with cyanide ultimately produces the thiocyanato complex. 

Recently, the crystal structure of Pt ClaCbipy) (bipy = bipyridyl) has been reported (542, 567). The structure of the dichroic red phase of this diamagnetic complex reveals a one-dimensional stack with the interplanar and platinum-platinum spacings of 3.40 and 345 A, respectively. Similarly, c -dichlorodiammineplatinum(II) forms one-dimensional chains in the solid with alternating noncollinear platinum-platinum spacings of 3.409 and 3.372 A (535). The electrical properties of PtCl2(bipy) and w-PtCl2(NH3)2 have not been reported. 

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