Journal
ORGANIC LETTERS
Volume 10, Issue 9, Pages 1739-1742Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ol8003832
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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.
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