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inorganic chemistry

Question Details:
Inorganic chemistry

CaC2 is an insulating ionic crystal. However, Y2Br2C2, which can be described as containing C24- ions, is metallic in two dimensions and becomes superconducting at 5K. Describe the possible electronic structure of C24-. In the crystal, monoclinic crystal symmetry leads to distortion of the Y6 surrounding structure. How might this change the electronic structure of the ion?

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