Marinotto Daniele, Marin Cosmina Andreea, Rau Ileana, Colombo Alessia, Fagnani Francesco, Roberto Dominique, Dragonetti Claudia
Istituto di Scienze e Tecnologie Chimiche (SCITEC) "Giulio Natta", Consiglio Nazionale delle Ricerche (CNR), Via C. Golgi 19, 20133 Milan, Italy.
Faculty of Chemical Engineering and Biotechnologies, National University of Science and Technology POLITEHNICA Bucharest, 1-7 Polizu Street, 011061 Bucharest, Romania.
Molecules. 2025 Mar 20;30(6):1395. doi: 10.3390/molecules30061395.
In this study, the photophysical properties of thin films of an Eu dye, namely europium tetrakis(dibenzoylmethide) triethylammonium (EuDTEA), within deoxyribonucleic acid (DNA) biopolymer functionalized with hexadecyltrimethylammonium chloride (CTMA) were extensively investigated and compared with those of thin films of the same dye embedded in more conventional polymers, like poly(methyl methacrylate) and polycarbonate. The new materials obtained have good optical properties, as shown by their absorption and emission spectra. Remarkably, a large enhancement in photoluminescence was observed upon the interaction of EuDTEA with DNA-CTMA (2- and 17-fold increase in luminescence quantum yield with respect to PMMA and PC). Photophysical analyses suggest that the emission enhancement was mainly due to the increase in the sensitization efficiency (η) from the ligands to the Eu ion along with the suppression of the vibrational deactivation upon immobilization onto the DNA-CTMA matrix, as the concentration of the complex increased from 20 to 50%. These phenomena are primarily driven by the transformation of the Eu micro-environments, which are created by the interactions between complex ligands and the DNA-CTMA matrix.
在本研究中，对十六烷基三甲基氯化铵（CTMA）功能化的脱氧核糖核酸（DNA）生物聚合物中铕染料薄膜，即四（二苯甲酰甲烷）三乙铵铕（EuDTEA）的光物理性质进行了广泛研究，并与嵌入聚甲基丙烯酸甲酯和聚碳酸酯等更传统聚合物中的相同染料薄膜的光物理性质进行了比较。所获得的新材料具有良好的光学性质，这从它们的吸收光谱和发射光谱中可以看出。值得注意的是，当EuDTEA与DNA-CTMA相互作用时，观察到光致发光有大幅增强（相对于聚甲基丙烯酸甲酯和聚碳酸酯，发光量子产率分别提高了2倍和17倍）。光物理分析表明，发射增强主要是由于从配体到铕离子的敏化效率（η）增加，以及固定在DNA-CTMA基质上时振动失活受到抑制，因为配合物浓度从20%增加到了50%。这些现象主要是由铕微环境的转变驱动的，这种转变是由配合物配体与DNA-CTMA基质之间的相互作用产生的。
