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用电化学方法将α,β,γ,δ-四(4-氨基苯基)卟啉单体聚合在铂丝电极上,可制备化学修饰型I-选择性电极.质子化卟啉衍生物的立体交联高聚大环与I-的作用具有强的主客体效应,使电极对I-具有高的选择性,并呈现与经典Hofmeister系列及一般金属卟啉中性载体膜电极不同的阴离子选择性次序:I~-》SCN~-》ClO_4~->NO_2~->Br~->NO_3~->Cl~->SO_4~(2-).电极对1×10~(-1)～2.6×10~(-6)mol·dm~(-3)呈线性响应,检测下限8.2×1O~(-7)mol·dm~(-3),斜率61±0.2mV/pl~-(27℃).测试了电极膜的交流阻抗行为.电极具有内阻小、响应快、抗毒化能力强、制备简便等优点.
Electrochemically, α, β, γ, δ-tetrakis (4-aminophenyl) porphyrin monomers were polymerized on a platinum wire electrode to prepare a chemically modified I-selective electrode. The protonated porphyrin derivative The effect of stereospecific macrocycle and I- has a strong host-guest effect, making the electrode highly selective for I- and presenting anions of choice different from those of the classical Hofmeister series and the general metalloporphyrin neutral carrier membrane electrode The order of I ~ - “SCN ~ -” ClO_4 ~ -> NO_2 ~ -> Br ~ -> NO_3 ~ -> Cl ~ -> SO_4 ~ (2-) × 10 ~ (-6) mol · dm -3, the detection limit was 8.2 × 10 ~ (-7) mol · dm -3 and the slope was 61 ± 0.2mV / The AC impedance behavior of the electrode film was tested.The electrode has the advantages of small internal resistance, fast response, strong anti-poison ability and easy preparation.