CaC2 is an insulating ionic crystal. However, Y2Br2C2, which can be described as containing C2 4- ions, is metallic in two dimensions and becomes superconducting at 5 K. Describe the possible electronic structure of C2 4-. In the crystal, monoclinic crystal symmetry leads to distortion of the Y6 surrounding structure. How might this change the electronic structure of the ion? (See A. Simon, Angew. Chem., Int. Ed. , 1997 , 36 , 1788.)
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