脂溶性酞菁钴(Ⅲ)为载体的高选择性亚硝酸根PVC膜电极

A Highly Selective Nitrite Sensitive PVC Membrane Electrode Using Lipophilic Phthalocyanine Cobalt(Ⅲ) Complex as the Carrier

以自制的4,4＇,4″,(?)一四特丁基酞菁钴(Ⅱ)为原料合成二氯4,4＇,4″,(?)一四特基酞菁钴(Ⅲ).以此为载体制备PVC膜电极.该电极的电位选择性次序明显不同于Hofmeister次序,其最佳响应斜率为-52mV/PNO_2^-,线性范围为3×～1×10^(-1)mol·dm^(-3)NaNO_2通过改变配合物轴向的配位阴离子,用紫外-可见光谱法对电极的响应机理作了初步探讨.

In this paper, dichloride 4,4',4',4''-tetra-tert-butylphthalocyanine cobalt(Ⅲ) was synthesized and incorporated into a PVC membrane. The electrode prepared exhibits a selectivity sequence which is different from the classical Hofmeister pattern. The electrode has a high selectivity for nitrite and exhibits a linear response from 3×105 to 1×10-1mol·dm-3 of nitrite with a slope of -52mV / decade. The response mechanism of the electrode was studied using solvent extraction and UV-Vis spectroscopy by. changing the axial coordination anions of the complex.