大环四氮杂四烯基金属配合物中性载体高选择性硫氰酸根离子电极的研究

Studies on Diazetetraene Cupric(Ⅱ) Metallic Complex as Neutral Carriers for the Preparation of Thiocyanate - Selective Ion Electrodes

该文研究了基于大环四氮杂四烯基金属配合物{[6,13-二乙酰基-5,14-二甲基-1,4,8,11-四氮杂十四-4,6,11,13]-四烯基(2-)]合铜(Ⅱ)},[Cu(Ⅱ)LH_2]为中性载体的阴离子选择性电极,该电极对硫氰酸根离子(SCN-)呈现出优良的电位响应性能和选择性,其选择性次序为:SCN^->ClO_4^->NO_2^->Cl^->Br^->NO_3^->SO_4^(2-)>I^-。采用交流阻抗技术和紫外可见光谱技术初步研究了电极的响应机理;并将电极初步应用于实际样品分析,结果令人满意。

Anion -selective electrode based on 3, 3' - [ethenebis(imidogenmethin) ] -bis -2, 4 - pentanedione cupric(Ⅱ) metallic complex [Cu(Ⅱ) -EBIBP] as the neutral carrier is described, which displays an anti - Hofmeister selectivity sequence with a preferential potentiometric response to thiocyanate. The selectivity sequence observed is SCN- > ClO4-> NO2 > Cl- > Br-> NO3-> SO42-> I . The response mechanism is discussed in view of the a. c. impedance technique and the UV spectroscopy technique. These deviations result from the direct interaction between the central metal and the analyte ion and steric effect associated with the structure of the carrier. The electrode can be applied to waste water analysis and the result is fair agreement with the result given by HLPC methods.