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No counteranions or solvent molecules are found in single crystals of [Ru(bpy)3]0, an air-sensitive but thermally stable new material. Analysis of the X-ray structural data reveals a relatively undistorted C3-symmetric system with empty lattice spaces, which are represented by empty circles in the picture on the right. This packing structure is reminiscent of those in electrides.
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Pérez‐Cordero et al. (1997) studied this question.
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