Photoswitchable alkoxy-bridged binuclear rhenium(i) complexes – a potential probe for biomolecules and optical cell imaging
作者:Veerasamy Sathish、Eththilu Babu、Arumugam Ramdass、Zong-Zhan Lu、Tzu-Ting Chang、Murugesan Velayudham、Pounraj Thanasekaran、Kuang-Lieh Lu、Wen-Shan Li、Seenivasan Rajagopal
DOI:10.1039/c3ra42627k
日期:——
We describe the solvothermal synthesis, structural characterization, photophysics and potential applications as probes of two alkoxy-bridged binuclear Re(I) complexes, [Re(CO)3(1,4-NVP)}2(μ2-OR)2] (1, R = C4H9; 2, R = C10H21; 1,4-NVP = 4-(1-naphthylvinyl)pyridine). Irradiation of 1 and 2 at 365 nm leads to an interesting trans-cis photoisomerization process, which was examined by 1H NMR, UV-vis, emission and time-resolved techniques. Compounds 1 and 2 exhibit photoswitchable luminescence enhancement arising from photoinduced intramolecular energy transfer from the 3MLCT state of the Re(I) chromophore to the triplet excited state of the ligand 1,4-NVP. In addition, these Re(I) complexes serve as excellent probes for the ultrasensitive detection of biological molecules, including bovine serum albumin (BSA) and a platelet derived growth factor (PDGF) binding aptamer. Our results also suggest that, since these Re(I) complexes have low cytotoxicity and fluorescence properties under physiological conditions, they could be a useful probe for optical imaging of cancer cells by confocal laser scanning microscopy.
我们介绍了两种烷氧基桥接双核 Re(I) 复合物 [Re(CO)3(1,4-NVP)}2(δ2-OR)2] 的溶热合成、结构表征、光物理以及作为探针的潜在应用(1,R = C4H9;2,R = C10H21;1,4-NVP = 4-(1-萘乙烯基)吡啶)。通过 1H NMR、UV-vis、发射和时间分辨技术对 1 和 2 在 365 纳米波长下的辐照导致了有趣的反式-顺式光异构化过程。化合物 1 和 2 显示出可光开关的发光增强,这是由于光诱导分子内能量从 Re(I) 发色团的 3MLCT 态转移到配体 1,4-NVP 的三重激发态。此外,这些 Re(I) 复合物还是超灵敏检测生物分子(包括牛血清白蛋白 (BSA) 和血小板生长因子 (PDGF) 结合适配体)的绝佳探针。我们的研究结果还表明,由于这些 Re(I)复合物在生理条件下具有较低的细胞毒性和荧光特性,它们可以作为一种有用的探针,通过共焦激光扫描显微镜对癌细胞进行光学成像。