Synthesis and crystal structure of a nickel(II) 2′-deoxy-6-thioguanosine nitrate complex

The reaction of Ni(NO₃)₂·6H₂O with the thio-modified nucleoside 2′-deoxy-6-thioguanosine (d-tG, C₁₀H₁₃N₅O₃S) in methanol in a 1:1.3 stoichiometric ratio deposited the title compound, [Ni(d-tG)₃](NO₃)₂·2H₂O, as green crystals. Despite the <1:3 Ni–ligand ratio used in the synthesis, the deoxy-thioguanosine binds to form three N⁷,S⁶-coordinated five-membered chelate rings with individual Ni^II ions in mononuclear complexes rather than bridge metal centres into more extended oligomeric or polymeric structures.