A cation-directed switch of intermolecular spin-spin interaction of guanosine derivatives functionalized with open-shell units

被引：20

作者：

Graziano, Carla ^{[1
]}

Masiero, Stefano ^{[1
]}

Pieraccini, Silvia ^{[1
]}

Lucarini, Marco ^{[1
]}

Spada, Gian Piero ^{[1
]}

机构：

[1] Univ Bologna, Dipartimento Chim Organ A Mangini, I-40126 Bologna, Italy

来源：

ORGANIC LETTERS | 2008年 / 10卷 / 09期

关键词：

D O I：

10.1021/ol8003832

中图分类号：

O62 [有机化学];

学科分类号：

070303 ; 081704 ;

摘要：

The guanosine derivative 1 functionalized with the persistent radical unit 4-carbonyl-2,2,6,6-tetramethylpiperidin-1-oxyl in solution has no particular intermolecular spin-spin interactions; however, in the presence of potassium ions this compound can form a D(4)-symmetric octameric assembly [1(8)K](+) in which the nitroxyl moieties show a weak electron spin-spin exchange interaction. Since the relative geometry of the radicals is the outcome of K(+)-directed self-assembly, the spin-spin interaction can be suppressed by removing the alkaline ion.

引用

页码：1739 / 1742

页数：4

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