| RESEARCH |
Zr complex has RBi=BiR ligand A compound (shown) in which a dibismuthene (a molecule with a bismuth-bismuth double bond) is complexed to a zirconocene has been prepared for the first time at the University of Georgia, Athens (J. Am. Chem. Soc. 2005, 127, 7672). It is the first organometallic compound containing Bi-Zr bonds and the only example of a ZrBi2 ring, according to the team led by chemistry professor Gregory H. Robinson. They prepared the complex by sodium metal reduction of (ç5-C5H5)2ZrCl2 with RBiCl2, where R is the bulky 2,6-dimesitylphenyl group. Since RBi=BiR with the identical R substituent can be prepared by itself, it's now possible to study this dibismuthene in both its uncomplexed and complexed forms, Robinson notes. The complexed ligand, for example, has an appreciably longer Bi-Bi bond. Although acyclic bonding models are conceivable for the metallocene-complexed dibismuthene, the researchers, in collaboration with theorist Paul v. R. Schleyer's group, conclude that the molecule is best depicted as a metallocycle. |
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