Abstract
THERE is an increasing interest in the ability of pyrimidine and purine bases to form complexes with metal ions. During physical studies on a variety of these compounds we obtained evidence for antiferromagnetic coupling between pairs of metal ions in one of the complexes formed between divalent copper and adenine(I), the deep blue inner complex Cu(C5H4N5)2.nH2O first reported by Weiss and Venner1. Sletten has shown2 that this compound is dimeric with a structure closely related to that of cupric acetate monohydrate. Pairs of copper atoms are held 2.947 Å apart by four adenine bridges, coordinated via N(3) and N(9). A water molecule completes the coordination environment of each metal ion. The compound was originally formulated1 with three molecules of water per metal ion, but our analytical results support Sletten's suggestion2, from crystal density measurements, that n=4.
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GOODGAME, D., PRICE, K. Magnetic Exchange in a Copper–Adenine Complex. Nature 220, 783–784 (1968). https://doi.org/10.1038/220783a0
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DOI: https://doi.org/10.1038/220783a0
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