单溴四苯基卟啉吸附在AgCl溶胶表面性质研究

Properties of 5-(o-Bromophenyl)-10,15,20-triphenylporphyrin Adsorbed on AgCl Colloid

合成了单溴四苯基卟啉—— 5 - (邻溴苯基 ) - 1 0 ,1 5 ,2 0 -三苯基卟啉 (H2 L) ,用元素分析 ,红外光谱、电子吸收光谱和氢核磁共振谱确定了其组成和结构。研究了 H2 L在醋酸中电子吸收光谱和在 Ag Cl溶胶上的表面化学反应。结果表明 ,单邻溴四苯基卟啉在冰醋酸中以二酸形式 H4 L2 + 和游离碱 H2 L形式存在 ,二者之间存在着电离平衡 :H4 L2 + =H2 L+2 H+ ;当 p H=7.0～ 1 1 .0时 ,H2 L在Ag Cl溶胶表面发生配位反应生成 Ag( ) L,并且溶液的 p H增大 ,配位反应的速率增大。

A new monosubstituted tetraphenylporphyrin, 5-(o-bromophenyl)-10,15,20-triphenylporphyrin[H_2L], was synthesized and characterized by elemental analysis, UV-Vis, IR and 1H NMR. The UV spectra and the reaction adsorbed on AgCl colloid of H_2L in glacial acetic acid are studied. The experimental results show that H_2L exist in equilibrum between the diacid form H_2L 2+ and the free base H_2L; At pH=7.0~11.0, H_2L is converted into Ag(Ⅱ)L on AgCl colloids, and the higher the pH of the sample, the faster the rate of the coordination reaction.