Octalanthanide Wheels Supported by p-tert-Butylsulfonylcalix[4]arene

✍ Scribed by Takashi Kajiwara; Hashen Wu; Tasuku Ito; Nobuhiko Iki; Sotaro Miyano

• Book ID: 101533154
• Publisher: John Wiley and Sons
• Year: 2004
• Tongue: English
• Weight: 201 KB
• Volume: 116
• Category: Article
• ISSN: 0044-8249
• DOI: 10.1002/ange.200353449

✦ Synopsis

Based on a bottom-up approach, [1] functionalized and structurally unique metal clusters with high nuclearity have been synthesized. Wheel-shaped clusters are one of the most highly symmetric architectures, [2] which often consist of first-row transition-metal ions. [2a-e] Lanthanide complexes have attracted considerable attention due to their practical properties. [3] However, multi-lanthanide complexes are rather rare. [2f, 4] Thus our goal was to develop a new and rational synthetic method to realize lanthanide cluster complexes. As a cluster-forming ligand, we employed a sulfonylcalix[4]arene (H 4 L) (Scheme 1). We have already shown that thiacalixarenes and their derivatives act as multinucleating [5a] or clusterforming ligands. [6] Since lanthanides show strong affinity towards oxygen donors, [7] H 4 L can act as a multidentate, multinucleating ligand via many oxygen sites. [5] Herein we report the syntheses, structures, and magnetic properties of lanthanide wheels, [Ln 8 (L) 4 (AcO) 8 (EtOH) 4 (H 2 O) 4 ] (Ln = Gd Scheme 1.

Step-by-step formation of a lanthanide wheel via a mononuclear subunit {Ln(L)} À .