Lutkouskaya Katsiaryna, Calzaferri Gion
Department of Chemistry and Biochemistry, University of Bern, Freiestrasse 3, CH-3012 Bern, Switzerland.
J Phys Chem B. 2006 Mar 23;110(11):5633-8. doi: 10.1021/jp056296i.
Host-guest materials containing strongly fluorescent donor and acceptor molecules have been prepared. Fine-tuning of the donor to acceptor distance in this material allows beautiful visible and quantitative observation of electronic excitation energy transfer phenomena. Oxonine and pyronine have been used as guest molecules and zeolite L as host. The dyes have been inserted by ion exchange. Stationary state and time-resolved experiments have been carried out with zeolite crystals of 300 and 700 nm size in the dye concentration range of 10(-4) mol/L up to 0.042 mol/L. The fluorescence decay of the donor and the pumping of the acceptor via energy transfer, which can be well observed, became faster with increasing loading. The behavior of the system follows requirements expected for Förster energy transfer material.
已制备出包含强荧光供体和受体分子的主客体材料。对该材料中供体与受体之间的距离进行微调，能够对电子激发能量转移现象进行美观的可视化定量观测。恶嗪和吡咯作为客体分子，而L型沸石作为主体。染料通过离子交换被插入其中。在染料浓度范围为10⁻⁴ mol/L至0.042 mol/L时，对尺寸为300和700 nm的沸石晶体进行了稳态和时间分辨实验。随着负载量的增加，可以清楚观察到的供体荧光衰减以及通过能量转移对受体的激发变得更快。该系统的行为符合福斯特能量转移材料的预期要求。
