an aromatic composition comprises aromatic substances that are encapsulated and / or clathrated in a matrix of polymer . the polymer includes an inorganic polymer produced from metal alkoxides ; a conjugated polymer produced from metal alkoxides and silane coupling agents ; and a conjugated polymer produced from metal alkoxides , silane coupling agents , and organic monomers . the aromatic composition has slow - release charactristics , so that the aromatic substances are released over a long period of time . in a method for the production of the aromatic composition , a catalyst for sol - gel methods that comprises an acid or its anhydride and an organic base , and if necessary , irradiation with ultraviolet light and / or an electron beam are used for making the polymer .