Departamento de Química Física, Universidad del País Vasco (UPV-EHU), Aptdo 644, 48080, Bilbao (Spain).
Chem Asian J. 2013 Dec;8(12):3133-41. doi: 10.1002/asia.201300857. Epub 2013 Sep 10.
This work deals with the synthesis and the photophysical and laser properties of new BODIPY-rhodamine cassettes. These dyads differ in their rigid and conjugated spacer group (phenyl or acetylenephenyl) and in their linking positions (meta or para). The photophysical properties of these cassettes are controlled by the formation/opening of the spirolactone ring, which, in turn, switches off/on an energy-transfer process between the chromophores. Herein, we thoroughly describe the influence of the attached spacer group, as well as the distance and orientation between the donor-acceptor pair, on the excitation energy transfer. The observed fast dynamics and efficiency suggest that the process mainly takes place "through-bond", although the "through-space" mechanism also contributes to the whole process. As a result, efficient laser emission from the rhodamine is achieved upon excitation of the BODIPY, in particular for the cassette that contains an acetylenephenyl spacer group in a para disposition.
这项工作涉及新型 BODIPY-罗丹明盒式染料的合成及光物理和激光性质。这些二聚体在刚性和共轭间隔基（苯基或乙炔基苯基）以及连接位置（间位或对位）上有所不同。这些盒式染料的光物理性质受螺内酯环的形成/开启控制，这反过来又可以关闭/开启发色团之间的能量转移过程。在此，我们详细描述了连接间隔基以及供体-受体对之间的距离和取向对激发能量转移的影响。观察到的快速动力学和效率表明，该过程主要通过“成键”发生，尽管“离域”机制也对整个过程有贡献。因此，在激发 BODIPY 时，罗丹明可以实现有效的激光发射，特别是对于在对位位置含有乙炔基苯基间隔基的盒式染料。
