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The organometallic cations [(η5-C5H5)2Co]+ and [(η5-C5H5)2Fe]+ are fully miscible in the solid state and form the mixed crystalline material [(η5-C5H5)2Cox Fe1−x][PF6], which undergoes two fully reversible phase transitions that can be tuned by varying the molar ratio of the two cations; the water-soluble organometallic salt thus possesses the behaviour of a molecular alloy.
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Braga et al. (2001) studied this question.
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