高分子显色剂中母链的增敏作用

Role of the main chain in polymeric chromogenic reagent

通过高分子显色剂 PV·FPNS 及相应小分子显色剂 FPNS、MPNS 以及 PVA 存在下的 FPNS 与镁(Ⅱ)的显色反应,探讨了高分子显色剂中母链的增敏作用。PV·FPNS-Mg(Ⅱ)、MPNS-Mg(Ⅱ)、FPNS-Mg(Ⅱ)和FPNS-PVA-Mg(Ⅱ)体系的有色配合物的摩尔吸光系数(ε×10^(-4))分别为4.7、2.8、2.1和1.62。

Chromogenic reactions of(a)the condensa-tion product of polyvinyl alcohol(PVA)and 3-(p-formylphenylazo)-chromotropic acid(PV·FP-NS),(b)3-(p-tolylazo)-4,5-dihydroxy-2,7-na-phthalenedisulphonic acid(MPNS),(c)3-(p-form-ylphenylazo)-4,5-dihydroxy-2,7-naphthalenedi-sulphonic acid(FPNS)and(d)FPNS in presenceof PVA with magnesium(Ⅱ)have been-studied experimentally in order to elucidate therole of the main chain in PV·FPNS.The sensiti-vity for magnesium(Ⅱ)is higher with PV·FPNSthan with the rest.The molar absorptivities((?)×10^(-4))of colour complexes formed by PV·FPNS,MPNS,FPNS and FPNS-PVA with magnesium(Ⅱ)are respectively 4.7,2.8,2.1 and 1.62L·mol^(-1)·cm^(-1).