Polymeric, Molecular and Ionic Organotin Complexes Containing Hypoxanthine, Adenine and 2‑Aminopurine. Synthesis and Supramolecular Structures

The reaction of L1H [L1H = 3-(N9-hypoxanthyl)­propanoic acid] with Me₃SnCl or (n-Bu₃Sn)₂O afforded the 1D coordination polymers [Me₃Sn­(L1)]_n (1) and [n-Bu₃Sn­(L1)]_n (2), respectively. A similar reaction between L2H [3-{N9-(2-amino­purinyl)}­propanoic acid] with (Ph₃Sn)₂O in a 2:1 ratio afforded a dimer [(L2)­(Ph₃Sn)­L2­{Ph₃Sn­(H₂O)}]·​3CH₃OH·​3H₂O (3). The reactions of 2-(N9-adeninyl)­acetic acid (L3H) and 3-(N9-adeninyl)­propanoic acid (L4H) with (Ph₃Sn)₂O in a 2:1 ratio afforded insoluble intractable products, which, upon addition of dilute HCl in methanol, afforded [{Ph₂SnCl₃­(H₂O)}­(HL3Me)₂Cl]·​H₂O (4) and [(Ph₂SnCl₄)­(HL4Me)₂] (5). Complexes 1–5 show an extensive supramolecular organization in the solid state as a result of several intermolecular interactions, prominent among which are the interactions between the nucleobases.