Trigonal Bi- and Monopyramidal Cobalt(II) Complexes of a Novel Guanidine-Based Tripodal Ligand

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• 作者：Cassandra E. Searls ; Scott T. Kleespies ; Matthew L. Eppright ; Sarina C. Schwartz ; Glenn P. A. Yap ; Robert C. Scarrow
• 刊名：Inorganic Chemistry
• 出版年：2010
• 出版时间：December 20, 2010
• 年：2010
• 卷：49
• 期：24
• 页码：11261-11263
• 全文大小：758K
• 年卷期：v.49,no.24(December 20, 2010)
• ISSN：1520-510X

文摘

The novel ligand DIG₃tren has three N′,N′′-diisopropylguanidinyl (DIG) moieties. We report on the structures of two cobalt complexes that show how an isopropylamino group from each DIG acts as a flap that can either close over the metal or rotate away from the metal to open up a site for auxiliary ligand binding. Two of the −NH(iPr) flaps are open in pink [Co(DIG₃tren)(OAc)]OAc (1), and each of these flaps provides a hydrogen bond to stabilize acetate binding to trigonal bipyrimidal cobalt. The flaps are closed in blue [Co(DIG₃tren)][BPh₄]₂ (2), yielding a rare example of a trigonal (mono)pyramidal [ML]²⁺ ion.