Abstract：
The development of new π-conjugated molecular structures with controlled self-assembly and distinct photophysical properties is crucial for advancing applications in optoelectronics and biomaterials. This study introduces the synthesis and detailed self-assembly analysis of tetraphenylethylene (TPE) functionalized naphthalene diimide (NDI), a novel donor-acceptor molecular structure referred to as TPE-NDI. The investigation specifically focuses on elucidating the self-assembly behavior of TPE-NDI in mixed solvents of varying polarities, namely chloroform: methylcyclohexane (CHCl3 : MCH) and chloroform: methanol (CHCl3 : MeOH). Employing a several analytical methodologies, including UV-Vis absorption and fluorescence emission spectroscopy, scanning electron microscopy (SEM), X-ray diffraction (XRD), and dynamic light scattering (DLS), these self-assembled systems have been comprehensively examined. The results reveal that TPE-NDI manifests as distinct particles in CHCl3 : MCH (fMCH =90 %), while transitioning to flower-like assemblies in CHCl3 : MeOH (fMeOH =90 %). This finding underscores the critical role of solvent polarity in dictating the morphological characteristics of TPE-NDI self-assembled aggregates. Furthermore, the study proposes a molecular packing mechanism, based on SEM data, offering significant insights into the design and development of functional supramolecular systems. Such advancements in understanding the molecular self-assembly new π-conjugated molecular structures are anticipated to pave the way for novel applications in material science and nanotechnology.
摘要：
具有受控自组装和独特光物理性质的新型π共轭分子结构的开发对于推进光电子学和生物材料的应用至关重要。本研究介绍了四苯基乙烯（TPE）功能化萘二酰亚胺（NDI）的合成和详细的自组装分析，一种称为TPE-NDI的新型供体-受体分子结构。该研究特别着重于阐明TPE-NDI在不同极性的混合溶剂中的自组装行为，即氯仿:甲基环己烷(CHCl3:MCH)和氯仿:甲醇(CHCl3:MeOH)。采用了几种分析方法，包括紫外-可见吸收和荧光发射光谱，扫描电子显微镜（SEM），X射线衍射(XRD)和动态光散射（DLS），这些自组装系统已经过全面检查。结果表明，TPE-NDI在CHCl3:MCH(fMCH=90%)中表现为不同的颗粒，同时过渡到在CHCl3:MeOH(fMeOH=90%)中的花状组件。这一发现强调了溶剂极性在决定TPE-NDI自组装聚集体的形态特征中的关键作用。此外，这项研究提出了一种分子堆积机制，根据SEM数据，为功能超分子系统的设计和开发提供了重要的见解。在理解分子自组装新的π共轭分子结构方面的这种进步有望为材料科学和纳米技术的新应用铺平道路。
