Influence of Belousov-Zhabotinsky substrate concentrations on autonomous oscillation of polymer chains with Fe(bpy)3 catalyst.
We studied the effect of initial substrate concentrations in the Belousov-Zhabotinsky (BZ) reaction on the optical transmittance self-oscillation behavior of a polymer chain consisting of N-isopropylacrylamide (NIPAAm) and a Fe catalyst ([Fe(bpy)3]). The driving force of this transmittance self-oscillation was the solubility difference between the reduced and oxidized states of the [Fe(bpy)3] moiety in the polymer chain. The amplitude of the soluble-insoluble self-oscillation of poly(NIPAAm-co-[Fe(bpy)3]) was significantly smaller than that of poly(NIPAAm-co-[Ru(bpy)3]). Theoretical simulation results attributed this behavior to the small difference in the solvent qualities, C*, of the reduced and oxidized states. Furthermore, we clarified that poly(NIPAAm-co-[Fe(bpy)3]) required a narrower concentration range of HNO3 to exhibit self-oscillation than poly(NIPAAm-co-[Ru(bpy)3]), since transmittance self-oscillation occurred only for [HNO3] = 0.3 M. The period of self-oscillation of poly(NIPAAm-co-[Fe(bpy)3]) in solution was controlled mainly by NaBrO3 concentration and was hardly influenced by the initial concentration of malonic acid.
Nanosystem Research Institute (NRI), National Institute of Advanced Industrial Science and Technology (AIST) , Central 5-2, 1-1-1 Higashi, Tsukuba 305-8565, Japan.
Yusuke
Y
Hara
Hiroyuki
H
Mayama
Kenji
K
Fujimoto
D015082:2,2'-Dipyridyl / Q000031:analogs & derivatives* / Q000737:chemistry; D000180:Acrylic Resins / Q000737:chemistry; D002384:Catalysis; D005296:Ferrous Compounds / Q000737:chemistry*; D017942:Nitric Acid / Q000737:chemistry; D009942:Organometallic Compounds / Q000737:chemistry; D058105:Polymerization; D011108:Polymers / Q000138:chemical synthesis / Q000737:chemistry*; D013053:Spectrophotometry
D000180:Acrylic Resins; D005296:Ferrous Compounds; D009942:Organometallic Compounds; D011108:Polymers; C415768:tris(2,2'-bipyridyl)ruthenium(II); C024793:tris(2,2'-bipyridyl)-Fe(II) complex; C052970:poly-N-isopropylacrylamide; D017942:Nitric Acid; D015082:2,2'-Dipyridyl