ABSTRACT A novel fluorescent naphthalimide derivative gelator (N-18) was designed and characterised which could form a stable gel in 1,4-dioxane/H2O (2/1, v/v), methyl sulfoxide (DMSO), ethanol/H2O (4/1, v/v), acetone/H2O (2/1, v/v) and methanol. The self-assembly process of molecule N-18 in the five solvents was carefully investigated by the field emission scanning electron microscope, UV-vis absorption spectra, fluorescence emission spectra, fourier transform infrared spectroscopy (FTIR), X-ray powder diffraction (XRD) and water contact angle experiments. Different structures from microbelts to helical nanofibers were formed in the self-assembly process. Hydrogen bonding and π–π stacking interaction were the mainly driving forces for the formation of gel. At the same time, the hydrophobic surface with the contact angles of 133°–142° was observed on the xerogel films N-18 from the above five solvents. Interestingly, molecule N-18 could be applied in bioimaging in a living cell. GRAPHICAL ABSTRACT

中文翻译：

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新型荧光萘二甲酰亚胺衍生物超分子自组装系统的设计与制备及其生物成像应用

摘要 设计并表征了一种新型荧光萘二甲酰亚胺衍生物凝胶剂 (N-18)，可在 1,4-二恶烷/H2O (2/1, v/v)、甲基亚砜 (DMSO)、乙醇/H2O ( 4/1, v/v)、丙酮/H2O (2/1, v/v) 和甲醇。通过场发射扫描电子显微镜、紫外-可见吸收光谱、荧光发射光谱、傅里叶变换红外光谱（FTIR）、X射线粉末衍射（XRD）等手段仔细研究了N-18分子在五种溶剂中的自组装过程。 ) 和水接触角实验。在自组装过程中形成了从微带到螺旋纳米纤维的不同结构。氢键和π-π堆积相互作用是凝胶形成的主要驱动力。同时，在来自上述五种溶剂的干凝胶膜 N-18 上观察到接触角为 133°–142° 的疏水表面。有趣的是，分子 N-18 可用于活细胞的生物成像。图形概要