鉛(II)及び亜鉛(II)ポルフィリン錯体の生成反応に対する超音波照射の効果

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The reaction of lead (II) and zinc (II) with 5,10,15,20-tetrakis (4-sulfonatophenyl)-porphyrin (H_2tpps^<4->) was studied under ultrasonic irradiation at 20 kHz and 40 kHz to clarify the effect of ultrasonic irradiation on metalloporphyrin formation. The power intensities of the ultrasonic irradiator, given in terms of the concentration of nitric acid generated during ultrasonic irradiation, were 2.66×10^<-5>Mh^<-1> and 1.05×10^<-5>Mh^<-1>for 20 kHz and 40 kHz, respectively. Temperature was strictly controlled during the ultrasonic irradiation. The ultrasonic irradiation caused the metalloporphyrin formation to slow down and led to the decomposition of the metalloporphyrin rather than the acceleration of the metalloporphyrin formation. The ultrasonic irradiation-induced decomposition of H_2tpps^<4->, Pb(tpps)^<4-> or Zn(tpps)^<4-> was more effective at 20 kHz than 40 kHz. The decomposition rate of the porphyrins increased in the order H_2tpps^<4-><Zn (tpps)^<4-><Pb (tpps)^<4->. Ninety-four percent of lead (II) porphyrin was decomposed by ultrasonic irradiation for 60 min at 20 kHz.
1995-03-05