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
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
收藏
页码:1739 / 1742
页数:4
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