Abstract
Methylmercury(II) complexes of 7-methylguanine (7mguaH) have been isolated from aqueous solution in the pH range 1-12 and structurally characterized. 1:1 complexes [(7mgua)HgCH 3]·2H 2O and [(7mguaH)HgCH 3][NO 3]· H 2O with respectively N1 - and N9-coordination (X-ray analyses) were obtained from solutions in the respective pH ranges 9–12 and 1–4. A 2:1 complex [(7mgua)(HgCH 3) 2][NO 3] with N1,N9-coordination (X-ray) may be prepared in the intermediate pH range 4–7. Two 3:1 complexes were isolated: [(7mgua)(HgCH 3) 3][NO 3] 2 from strongly acid solution (pH = 1–3), and [(7mguaH −1)(HgCH 3) 3][NO 3] in the pH range 7–9. Whereas an X-ray analysis establishes N1,N3,N9-coordination for the former species in the solid state, the 1H NMR data suggest N2,N3,N9-coordination for the former and N2,N2,N9-coordination for the latter species in d 6-DMSO solution.
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