A C Symmetric Nitrate Complex with a Thiophene-Based Tripodal Receptor.

A C Symmetric Nitrate Complex with a Thiophene-Based Tripodal Receptor.
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具有噻吩基三二极体受体的C对称硝酸盐配合物。

DOI:
10.1021/cg2001859
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发表时间:
2011-04-06
影响因子:
3.8
通讯作者:
Hossain, Md Alamgir
Hossain, Md Alamgir
中科院分区:
化学2区
文献类型:
--
作者:
Isiklan, Muhammet;Saeed, Musabbir A.;Pramanik, Avijit;Wong, Bryan M.;Fronczek, Frank R.;Hossain, Md Alamgir

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合成了一种基于噻吩基的三脚架受体,并通过单晶X-射线分析确定了其与硝酸盐和碘化物的配合物。在硝酸盐络合物中,一个硝酸盐以选择性取向被包裹形成C3对称络合物,该络合物以六个NH···O键与三个质子化的仲胺键合。阴离子在垂直于主旋转轴的平面上配位,穿过受体的叔氮和被包裹的硝酸盐的氮。高水平的密度泛函计算支持结晶学结果,表明三个氧原子结合的加合物比包裹的硝酸盐中一个氧原子的加合物更稳定。另一方面,在碘复合体的结构中,三种碘都位于腔外。核磁共振研究表明,该受体在氯仿中与硝酸盐形成1:1的络合物,结合常数K=315M−1,对卤化物和高氯酸盐有一定的选择性。
A thiophene-based tripodal receptor has been synthesized and its complexes with nitrate and iodide have determined by single-crystal X-ray analysis. In the nitrate complex, one nitrate is encapsulated in a selective orientation forming a C3 symmetric complex, which is bonded to three protonated secondary amines with six NH···O bonds. The anion is coordinated in a plane perpendicular to the principal rotation axis passing through the tertiary nitrogen of the receptor and the nitrogen of the encapsulated nitrate. High-level DFT calculations support the crystallographic results demonstrating that an adduct with trigonal binding of three oxygen atoms is more stable than that of one oxygen atom of the encapsulate nitrate. On the other hand, in the structure of the iodide complex, all three iodides lie outside the cavity. 1H NMR titration studies indicate that the receptor forms a 1:1 complex with nitrate with a binding constant of K = 315 M−1 in chloroform, showing a moderate selectivity over halides and perchlorate.
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