The purine base in a copper–nucleoside analogue has been shown to possess only one binding site, N(7), indicating that the direction of the co-ordinating orbital on the imidazole nitrogen is not compatibel with the formation of a chelate structure inovolving N(7) and O(6).
E. Sletten, J. Chem. Soc. D, 1971, 558 DOI: 10.1039/C29710000558
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