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The crystal structure of bisindenylruthenium, (CgHT)2Ru, has been determined and refined by threedimensional X-ray diffraction techniques. The crystals are monoclinic, space group P21/a, with a= 14"51, b= 14.05, c= 6.23/~, ,8= 94.10°; there are four molecules in the cell. Intensities were estimated visually from Weissenberg photographs about b and c; the structure was derived from Patterson and electron-density maps and refined by least-squares methods. The final R index for 2031 observed reflections is 0.057.The molecule is in the fully eclipsed conformation, with the ruthenium atom lying midway between the two five-membered rings and nearly on their common axis. The indenyl groups are approximately parallel, the distance between them ranging from 3.62 to 3.69 A. A valence-bond treatment satisfactorily explains the C-C and Ru-C distances.A second crystal modification of bisindenylruthenium has also been obtained. These crystals, too, are monoclinic, space group P21/a, but with approximate cell dimensions a= 11.1, b=9"3, c=6"2 A,, ,8= 90°; there are two molecules in the cell. The structure of this modification is disordered, but appears to be closely related to that of the other (ordered) form.

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