Anion binding with a tripodal amine
Anion binding with a tripodal amine
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DOI：
10.1021/ic049762b
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发表时间：
2004-06-14
影响因子：
4.6
通讯作者：
Bowman-James, K
中科院分区：
文献类型：
--
作者：
Hossain, A;Liljegren, JA;Bowman-James, K
本文报道了三胺（N，N '，N“-三（2-苄基氨基乙基）胺）与无机阴离子的结合研究，并报道了[H_3L][H_2PO_4]（3）·H_3PO_4和[H_3L][Br]（3）两种晶体结构。NMR滴定结果表明，配体与H_2PO_4 ~-和HSO_4 ~-的结合强度大于NO_3和卤化物。在磷酸盐复合物的晶体结构中，配体被三质子化，三个臂以三角平面状排列指向外，四种磷酸盐物质与受体结合，并已被指定为位于每个tren臂之间的三个H2 PO 4-抗衡离子，以及准平面tren上方的额外H3 PO 4分子。溴化物复合物的结构略有不同，尽管tren受体再次被三质子化并且是准平面的，但在这种情况下，可以看到C-2 v样对称性，其中两个臂指向相同的方向，溴离子在其间。另外两个溴化物位于tren臂的外部。
Binding studies of the tren-based amine, L (N,N',N''-tris(2-benzylaminoethyl)amine), with inorganic anions and two crystal structures, [H3L][H2PO4](3).H3PO4 and [H3L][Br](3), are reported. NMR titration results indicate that the ligand binds 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 phosphate species are associated with the receptor, and have been assigned as three H2PO4- counterions located between each of the tren arms, and an additional H3PO4 Molecule above the quasi-planar tren. The structure of the bromide complex is slightly different, although again the tren receptor is triprotonated and quasi-planar, but in this case C-2v-like symmetry is seen with two of the arms pointed in the same direction with a bromide ion in between. The other two bromides lie outside of the tren arms.