A heptachromium(II) metal chain helically wrapped by four all-syn type teptra3– ligands with delocalized CrII–CrII–CrII–CrII–CrII–CrII–CrII multiple bonds is found in the complex [Cr7(µ7-teptra)4Cl2]. The band structure of a hypothetical one-dimensional chromium string based on this structure is calculated and shows metallic behavior for the string structure.
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Chen et al. (1999) studied this question.
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