after exposure. Primary amines were expected to invoke the greatest sensing response due to (i) their larger association constants with these porphyrins compared to secondary and tertiary amines and (ii) the ease of diffusion of amines which is expected to follow the order primary > secondary > tertiary due to the steric hindrance arising from the bulky secondary and tertiary amines. However, the magnitude
两种
卟啉化合物,
锌(II)5,10,15,20-四(3,5,5-三甲基-N-苯基己酰胺)
卟啉和
锌(II)5,10,15,20-四(2,2-已经研究了二甲基-N-苯基丙酰胺)
卟啉作为检测烷基胺的可能候选物。紫外可见光谱显示,它们的溶液吸收光谱在与多种有机分析物(包括
乙酸,
丁酮,
乙酸乙酯,己
硫醇,
辛酸,
辛醇,烷基胺和亚
磷酸三甲酯)相互作用后会发生显着变化。由于
锌和胺部分之间的特定亲和力,观察到烷基胺家族的光谱变化很大。制备
卟啉的Langmuir-Blodgett(LB)膜是为了评估其对胺的固态传感能力。表面压力区域(Pi-A)等温线揭示了清晰的三相Langmuir膜行为,并表明这些单层膜可能被压缩到相对较高的表面压力(大约40-50 mN m(-1))。等温线数据与分子模型一起表明这两种化合物的
卟啉环的取向相对平坦:也就是说,
卟啉环的平面与
水表面的相互平行排列。在15 mN m(-1)处沉积的LB膜已暴露于烷基胺蒸气(由N