邻苯二胺、邻氨基酚的电化学聚合及聚合的膜性质

邻苯二胺(ODB), 邻氨基酚(OAP)在酸性水溶液中易电聚合, 可形成致密的聚合膜。聚邻苯二胺(PODB)在PH<4时具有电活性, 其氧化还原反应与电变色效应对应。聚邻苯二胺,聚邻氨基酚(POAP)膜电极电位在pH=4～10范围对pH有Nernst响应, 电极系数分别为59mV/pH和57mV/pH。响应时间小于3分钟。PODB, POAP膜能与Ni~(2+), Co~(2+)过渡金属离子形成稳定的聚合络合膜。此膜在碱性介质中具有稳定的循环伏安行为, 膜中的金属离子可被H~+交换。PODB电极的—NH_2基可再修饰引入醌/氢醌功能团。

THE ELECTROCHEMICAL POLYMERIZATION OF ORTHO-DIAMINOBENZENE ORTHO-AMINOPHENOL AND THE PROPERTIES OF POLYMER FILMS

Ortho-diaminobenzene (ODB), Ortho-aminophenol (OAP) can be easily electropolymerized in acid aqueous solution, form continouus and adherent films. The polymer are 1,4-para position coupling. When pH<4, PODB is electroactive, its redox reaction which leads to the electrochromic behavior is concerned with H~+ ions. The electrode potentials of PODB, POAP behave Nernstian response vs. pH values from pH=4—10, electrode coefficience are 59mV/pH and 57mV/pH respectively. The Polymer H~+ ion selective electrode have realtively short respones time (less than 3 min.), good selectivity, reproductivity and stability. PODB, POAP are able to form complexes with transtion-metal ions Ni~(2+) and Co~(2+). The polymercomplex film show very stable cyclic voltametric behavior in alkaline media, the metal ions in film can be exchanced by H+ ion. —NH_2 group in PODB electrode can be remodified o introduce the quinone/hydroquinone functional group.