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.