Anion Binding with a Tripodal Amine

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• 作者：Md. Alamgir Hossain ; Jennifer Ann Liljegren ; Douglas Powell ; and Kristin Bowman-James
• 刊名：Inorganic Chemistry
• 出版年：2004
• 出版时间：June 14, 2004
• 年：2004
• 卷：43
• 期：12
• 页码：3751 - 3755
• 全文大小：135K
• 年卷期：v.43,no.12(June 14, 2004)
• ISSN：1520-510X

文摘

Binding studies of the tren-based amine, L (N,N',N' '-tris(2-benzylaminoethyl)amine), with inorganic anions and twocrystal structures, [H₃L][H₂PO₄]₃·H₃PO₄ and [H₃L][Br]₃, are reported. NMR titration results indicate that the ligandbinds H₂PO₄^- and HSO₄^- more strongly than NO₃^- and halides. In the crystal structure of the phosphate complex,the ligand is triprotonated with the three arms pointing outward in a trigonal-planar-like arrangement. Four phosphatespecies are associated with the receptor, and have been assigned as three H₂PO₄^- counterions located betweeneach of the tren arms, and an additional H₃PO₄ molecule above the quasi-planar tren. The structure of the bromidecomplex is slightly different, although again the tren receptor is triprotonated and quasi-planar, but in this caseC_2v-like symmetry is seen with two of the arms pointed in the same direction with a bromide ion in between. Theother two bromides lie outside of the tren arms.