the absorption spectra at longer wavelengths which indicates that the fraction of J-aggregates was enhanced by Ag+ in LB films. The molecular orientation in LB films was investigated by polarized absorption spectroscopy and a tilt angle was calculated to be 49° with the substrate normal for symmetric and 74.6° for the asymmetric Zn–Pc. The presence of Ag+ cations in the subphase decreased the tilt angles
在溶液中,在空气-
水界面以及转移到
玻璃基板上的Langmuir-Blodgett(LB)膜中,已经研究了Ag +介导的两种不同的两亲性
锌酞菁(Zn-Pcs)(对称和不对称)的聚集行为。在高[Ag + ]浓度下,对称和不对称的Zn-Pcs均观察到4:1([Ag + ] / [Pc])络合物,这导致溶液中形成H聚集体。在空气-
水界面处,对称和不对称的Zn-Pcs在柱状烟囱中都显示出倾斜的边沿取向。Ag +的添加到亚相的增加增强了单层中的顺序。
玻璃基板上的LB膜显示Q波段分裂,表明存在由H和J聚集体组成的“鱼骨”型聚集体。对于从含Ag +的亚相沉积的LB薄膜,在较长波长的吸收光谱中出现了肩峰,这表明LB薄膜中的Ag +提高了J聚集体的比例。LB膜中的分子取向通过偏振吸收光谱法进行了研究,相对于对称的基底
法线,倾斜角经计算为49°,对于不对称的Zn–Pc,倾斜角为74.6°。亚相中Ag +阳离子的