Synthesis and chracterization of heterometallic [Cr7M] wheels
Synthesis and chracterization of heterometallic [Cr7M] wheels
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DOI：
10.1002/anie.200390034
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发表时间：
2003-01-01
影响因子：
16.6
通讯作者：
Winpenny, REP
中科院分区：
文献类型：
--
作者：
Larsen, FK;McInnes, EJL;Winpenny, REP
Many beautiful cyclic metal structures have been reported recently, for example, the giant wheels from Mller and coworkers,[1] the wheels using carboxylate ligands made by, among others, the Lippard group,[2] and the metallocoronands reported by Saalfrank and co-workers.[3] One question that intrigued us based on this chemistry was whether heterometallic rings could be made? A recent theoretical paper by Meier and Loss [4] suggests that such wheels may show interesting quantum coherence phenomena. We have found that an extensive family of such wheels can be made straightforwardly, and in good yield, based on the fundamental chemical principle that a cation±anion pair will have different crystallization properties than a neutral molecule. The neutral homometallic wheel,[Cr8F8 (O2CCMe3) 16](1)[5] has been widely studied, both because of its magnetic properties [6] and because it can act as a host for small organic molecules.[7] As we understand the chemistry of 1 thoroughly, it seemed a good candidate for preparing heterometallic analogues. The approach adopted was straightforward; if we replace a single chromium (iii) center by a dication (M) the monoanionic species [Cr7MF8 (O2CCMe3) 16] À will be formed. In the presence of a suitable cation, we should then be able to separate the salt from 1, which may also be present. Using this
