Based on reactions known in organotin chemistry, the robust hexaferrocene assembly [{BuSn(O)OC(O)Fc}6] is obtained in quantitative yield by the reaction of two commercially available reactants. The X‐ray crystal structure (see picture) shows a symmetric giant wheel arrangement of the ferrocene units attached in a cyclic manner to a central drumlike stannoxane core. Cyclic voltammetric studies show a single quasireversible oxidation peak.
Mononuclear lanthanide-based single-ion
magnets (SIMs) are known
since 2003 with the discovery of SIM properties in a bis-(phthalocyaninato)lanthanide
complex. A recent report on [Dy(Cp
ttt
)
2
][BC
6
F
5
] indicating that it exhibits the highest known
blocking temperature (60 K) has spurred fresh interest in this area.
In this article, we discuss about the various requirements of lanthanide-based
SIMs along with representative examples. Specifically, we describe
the complexes whose coordination numbers vary from 2 to 8. We also
discuss the representative examples of organometallic lanthanide complexes
that can function as molecular magnets.
A linear trinuclear mixed-metal Co(2)Gd complex supported by two phosphorus-based multisite coordination ligands has been shown to be a single-molecule magnet.
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