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The crystal structure of  bis -methallylnickel has been determined from three-dimensional x-ray diffraction data. The space group is  P 2 1 / c − C  2 h   5 , with  a  = 6.05;  b  = 13,48;  c  = 5.83 Å;  β  = 117.1°. The unit cell contains 2 molecules with Ni in centres of symmetry. The methallyl groups are symmetrically bonded to the nickel in an anti-sandwich arrangement. This causes the intramolecular symmetry to be 2/ m . The methallyl groups are found to be nonplanar and the Ni–C bonds are quite short (average 2.02 Å).

Kristall- und Molekülstruktur von bis -Methallylnickel Ni[(CH 2 ) 2 C · CH 3 ] 2