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将没有双亲性的电荷转移配合物TMB.TCNQ(TMB:3,3′,5,5-′Tetramethylbenzidine;TCNQ:7,7,8,8-tetracyanoquinodimethane)通过与硬脂酸混合组装制备了混合LB膜。TMB.TCNQ和硬脂酸的摩尔比例在1∶1,1∶2和1∶3的情况下都可以成功进行组装。利用紫外-可见-近红外光谱、透射和掠角反射红外光谱、X射线衍射以及原子力显微镜研究了混合LB膜中各组分的结构、分子取向和表面形貌等。研究结果表明,混合LB膜中的TMB.TCNQ是混合堆积排列的,电荷转移度ρ约为0.35。配合物中的电子给体TMB和电子受体TCNQ分子的苯环平面都垂直于基底表面。硬脂酸的碳氢长链以一定角度倾斜于基底表面。混合LB膜的小角X射线衍射图中出现了两组衍射峰。混合比例为1∶1的单层和多层LB膜中出现纳米棒和微粒,而且,纳米棒和粒子的数量随着LB膜层数的增加而增多。
The amphiphilic charge-transfer complex TMB.TCNQ (TMB: 3,3 ’, 5,5’-Tetramethylbenzidine; TCNQ: 7,7,8,8-tetracyanoquinodimethane) was prepared by mixing and assembling with stearic acid membrane. TMB.TCNQ and stearic acid molar ratio of 1: 1, 1: 2 and 1: 3 cases can be successfully assembled. The structure, molecular orientation and surface morphology of each component in the hybrid LB films were investigated by UV-Vis-NIR spectroscopy, transmission and sweep angle reflection infrared spectroscopy, X-ray diffraction and atomic force microscopy. The results show that the mixed LB film TMB.TCNQ is a mixed stacking arrangement, the charge transfer degree ρ is about 0.35. Both the electron donor TMB and the electron acceptor TCNQ molecule in the complex have their planes of benzene perpendicular to the substrate surface. The long chains of stearic acid are inclined at an angle to the surface of the substrate. Two sets of diffraction peaks appeared in the small-angle X-ray diffraction pattern of mixed LB films. The nanorods and microparticles appeared in the monolayer and multilayer LB films with a mixing ratio of 1: 1, and the number of nanorods and particles increased with the number of LB films.