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(a) X-ray crystal structure of metalla-rectangle 5. Solvent molecules, counter-anions and hydrogen atoms are omitted for clarity (Color codes: green = Ru, red = O, blue = N and grey = C). (b) Crystal packing diagram of 5 with a space-filling model. The mark (#) on atom labels denote the elements generated by inversion symmetry (−x, −y, −z).
