Melamine-barbiturate supramolecular assembly as pH-dependent radical trap material.

In last two decades a large number of self-assembly materials was synthesized and they have already found their way into large-scale industry and science. Hydrogen-bond based supramolecular adducts are found to have unique properties and to be a perfect host structures for trapping target molecules or ions. Such chemical systems are believed to resemble living matter and can substitute living cell in a number of cases. Herein report on an organic material based on supramolecular assembly of barbituric acid and melamine is represented. Surprisingly, the structure is found to host and stabilize radicals in mild conditions allowing biological applications. The number of free radicals is found to be easily tuned by changing the pH of preparation environment and is rising being exposed to light up to a saturation level. We describe a preparation methodic as well as stability properties of melamine barbiturate self-assembly, potentiometric titration and hydrogen ions adsorption data and EPR spectra concerning the composite.