Li Hongxu, Cui Ying, Tao Min, Sun Shuo, Yan Xinyao, Xiao Yin
School of Chemical Engineering and Technology, Tianjin University, Tianjin 300350, China.
School of Science, Tianjin University, Tianjin 300350, China.
Phys Chem Chem Phys. 2024 Apr 3;26(14):10515-10519. doi: 10.1039/d3cp05277j.
Förster resonance energy transfer (FRET) holds a significant position in various natural and artificial systems, especially within donor-acceptor systems encompassing chiral components. Despite extensive investigations, a clear understanding of the effects of chirality and FRET on discriminatory fluorescence remains elusive. Here, chiral perovskite nanowires (CPNWs) and achiral rhodamine B (RhB) are employed to examine the FRET and discriminatory fluorescence behavior in a donor-acceptor system involving a chiral nanostructure. A notable FRET from the CPNWs to RhB is observed, along with circular dichroism (CD) and circularly polarized luminescence (CPL) activities in RhB. Although the FRET interaction remains consistent over time, a notable inversion in the polarity preference of the CD and CPL of RhB is observed. This reveals that the discriminatory fluorescence of the acceptor arises from the electromagnetic influence of the chiral donor. These findings elucidate that "chirality", as a property related to spatial orientation, cannot accompany the transfer of energy (which is a scalar) from chiral nanostructures to achiral molecules, which helps advance the understanding of the discriminatory fluorescence in the donor-acceptor system with a chiral nanostructure.
Förster共振能量转移（FRET）在各种自然和人工系统中占据重要地位，尤其是在包含手性成分的供体-受体系统中。尽管进行了广泛的研究，但对手性和FRET对鉴别荧光的影响仍缺乏清晰的理解。在此，采用手性钙钛矿纳米线（CPNWs）和非手性罗丹明B（RhB）来研究涉及手性纳米结构的供体-受体系统中的FRET和鉴别荧光行为。观察到从CPNWs到RhB的显著FRET，以及RhB中的圆二色性（CD）和圆偏振发光（CPL）活性。尽管FRET相互作用随时间保持一致，但观察到RhB的CD和CPL的极性偏好发生了显著反转。这表明受体的鉴别荧光源于手性供体的电磁影响。这些发现阐明，作为与空间取向相关的性质，“手性”不能伴随能量（这是一个标量）从手性纳米结构转移到非手性分子，这有助于推进对具有手性纳米结构的供体-受体系统中鉴别荧光的理解。
