Homocianu Mihaela, Perju Elena
"Petru Poni" Institute of Macromolecular Chemistry, 41A, Grigore Ghica Voda Alley, 700487 Iasi, Romania.
Int J Mol Sci. 2025 Mar 13;26(6):2566. doi: 10.3390/ijms26062566.
This study investigates the liquid crystalline behavior, photophysical properties, and metal ion sensing capabilities of a pyrene-based imine dimer (DPyH9). The compound exhibits monotropic nematic mesophase behavior, with a glass transition at 43 °C, as confirmed by polarized light microscopy (PLM) and differential scanning calorimetry (DSC). Its photophysical properties, including UV-vis absorption, solvatochromic fluorescence, and acidochromism, observed through spectral shifts upon HCl addition, were systematically analyzed. Notably, DPyH9 displayed selective metal ion sensing capabilities towards Sn and Cu with binding constants of 4.51 × 10 M and 4.03 × 10 M and detection limits of 1.61 × 10 M (Sn) and 4.73 × 10 M (Cu). Fluorescence titrations revealed distinct responses: Sn induced an initial quenching and an enhancement at higher concentrations, while Cu caused significant fluorescence quenching. These results therefore highlight DPyH9 as a potential candidate for sensing applications and optoelectronic devices.
本研究考察了一种芘基亚胺二聚体（DPyH9）的液晶行为、光物理性质及金属离子传感能力。通过偏光显微镜（PLM）和差示扫描量热法（DSC）证实，该化合物呈现单向向列相液晶行为，玻璃化转变温度为43℃。通过加入HCl后的光谱位移，系统分析了其光物理性质，包括紫外可见吸收、溶剂化显色荧光和酸致变色。值得注意的是，DPyH9对Sn和Cu表现出选择性金属离子传感能力，结合常数分别为4.51×10 M和4.03×10 M，检测限分别为1.61×10 M（Sn）和4.73×10 M（Cu）。荧光滴定显示出不同的响应：Sn在低浓度时引起初始猝灭，在高浓度时增强，而Cu则导致显著的荧光猝灭。因此，这些结果突出了DPyH9作为传感应用和光电器件潜在候选物的地位。
