The Study Of Radical-controlled B-Z Type Oscillation

Chemical oscillation is one of the hot subjects of modern physical chemistry. Asthe classical kinetics and thermodynamics can't explain chemical reactions, the studieson the chemical reactions will be useful to develop the principle of physical chemistry.Besides, Having found quite a lot of oscillating phenomena in the life entity, thuschemical oscillation have invoked considerable interests and extensive attention. Upto now, a great number of chemical oscillators have been reported, among themBelousov–Zhabotinskii(BZ) type reactions have been studied most thoroughly. Nearlyall the organic substrates used in BZ oscillating reactions are easily brominated, suchas those with active methylene groups or benzene cycles. If the organic substrate isunable to be brominated, it is necessary to add either a bromine agent(e.g., acetone),or a reduced agent(e.g., Fe(phen)²⁺₃ ), or bubble the solution with an inert gas flow(usually a N₂ flow), or perform the oscillations in the continuous flow stirred tankreactor(CSTR) to remove excess Br₂ produced during the oscillation. Only very fewBZ type oscillators have been reported so far which involve single substrate unable tobe brominated. It is well known that both saccharides and amino acids are the basicmaterials for the living bodies. Studies on the chemical oscillations with the organicsubstrates which are essential for the living bodies can greatly help to understand theperiodic behavior in various biological processes. In the present dissertation, severalBZ type oscillators with saccharides and amino acids as substrates have been designed.On one hand, the present work may enlarge the scope of BZ oscillating reactionsystems. On the other hand, as both saccharides and amino acids are unablebrominated, studies on the reaction mechanism of these systems will result in themodification of FKN mechanism. Furthermore, many sequential oscillations havebeen observed in the as-designed oscillating systems. These studies will supply moreinformation concerning chemical oscillating mechanism. Briefly, the major researchworks are summarized as (I) Gal-Mn²⁺-BrO^-₃ -H₂SO₄ system; (II) Fru-Mn²⁺-BrO^-₃ -H₂SO₄ system; (III)Mal-Mn²⁺-BrO^-₃ -H₂SO₄ system; (IV)Suc -Mn²⁺-BrO^-₃ -H₂SO₄...