| Summary: | Interest in platinum-chain complexes arose from their unusual oxidation states and physical properties. Despite their compositional diversity, isolation of crystalline chains has remained challenging. Here we report a simple crystallization technique that yields a series of dimer-based 1D platinum chains. The colour of the Pt[superscript 2+] compounds can be switched between yellow, orange and blue. Spontaneous oxidation in air is used to form black P[superscript 2.33+] needles. The loss of one electron per double salt results in a metallic d[subscript z[superscript 2]] state, as supported by quantum chemical calculations, and displays conductivity of 11 S cm[superscript −1] at room temperature. This behaviour may open up a new avenue for controllable platinum chemistry.
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