BN-Perturbed Metallocenes

Abstract
1,2-azaborolinyl systems (Ab) are derived from the well-known C5H5 ring (Cp) by substitution of two C atoms by the isoelectronic BN group. Like Cp, the Ab rings form a variety of sandwich compounds with transition metals. The BN-perturbation causes various structural consequences in the complexes. Due to the prochiral character of the C3BN ring, diastereoisomers are formed. Depending on the electron configuration of the metal, slip distortions are observed. Electron-rich metals such as Co or Ni avoid contact with the donor atom N, electron-poor elements like Ti or V avoid contact with the acceptor B. 1,2-azaborolinyl sandwich complexes can therefore act as model compounds to study the metal behavior in sandwich structures depending on the electron configuration.

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