A phase transition starting at 84 K and indicated by a marked color change of the sample has been found in the organic insulator tetrathiafulvalene-chloranil. Optical, infrared, and Raman measurements indicate that this is a reversible transition from a nominally neutral (N) solid to a nominally ionic (D salt. Surprisingly, the N-I transition is not first order, but occurs over a broad temperature region (~ 30 K), in which there is a coexistence of N and I molecules.
Das aus Bis(oz‐mercapto)‐o‐xylol (I) und FeCl3 darstellbare" Dianion (II) entspricht in seiner Elektronenstruktur den aktiven Bestandteilen der P?anzenferredoxine und Ferredoxinproteine (spektroskopische und magnetische Daten).
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