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Science 19 March 2004:
Vol. 303. no. 5665, pp. 1849 - 1851
DOI: 10.1126/science.1093846
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Reports

Electrical or Photocontrol of the Rotary Motion of a Metallacarborane

M. Frederick Hawthorne,1* Jeffrey I. Zink,1 Johnny M. Skelton,1 Michael J. Bayer,1 Chris Liu,1 Ester Livshits,2 Roi Baer,2 Daniel Neuhauser1

Rotary motion around a molecular axis has been controlled by simple electron transfer processes and by photoexcitation. The basis of the motion is intramolecular rotation of a carborane cage ligand (7,8-dicarbollide) around a nickel axle. The Ni(III) metallacarborane structure is a transoid sandwich with two pairs of carbon vertices reflected through a center of symmetry, but that of the Ni(IV) species is cisoid. The interconversion of the two provides the basis for controlled, rotational, oscillatory motion. The energies of the Ni(III) and Ni(IV) species are calculated as a function of the rotation angle.

1 Department of Chemistry and Biochemistry, University of California, Los Angeles, CA, 90095–1569, USA.
2 Department of Chemistry, Hebrew University of Jerusalem, Givat Ram, Jerusalem, Israel.

* To whom correspondence should be addressed. E-mail: mfh{at}chem.ucla.edu

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