Kundelev Evgeny V, Orlova Anna O, Maslov Vladimir G, Baranov Alexander V, Fedorov Anatoly V
Department of Optical Physics and Modern Natural Science, ITMO University, Saint Petersburg, Russia.
Chirality. 2018 Mar;30(3):261-267. doi: 10.1002/chir.22788. Epub 2017 Nov 27.
Chiral properties of surface complexes based on CdSe/ZnS quantum dots (QDs) and 1-(2-pyridylazo)-2-naphthol (PAN) azo dye were investigated by circular dichroism spectroscopy. The use of L-, D-cysteine (Lcys, Dcys) capping ligands allowed us to obtain water-soluble chiral QD-PAN complexes. The characterization of the complexes was performed by UV-vis, FTIR, and CD spectroscopy. Quantum chemical TDDFT calculated CD spectra reproduced the experimentally observed sign patterns, which originate from binding Lcys or Dcys and PAN molecules to the same Zn atom on the QD surface. The resulting complex is characterized by a large circular dichroism in comparison with an ordinary QD chirality induced by cysteine molecules. The pattern of CD signal is the same for Lcys and Dcys ligands in chiral QD-PAN complex.
通过圆二色光谱研究了基于CdSe/ZnS量子点（QDs）和1-(2-吡啶偶氮)-2-萘酚（PAN）偶氮染料的表面配合物的手性性质。使用L-、D-半胱氨酸（Lcys、Dcys）封端配体使我们能够获得水溶性手性量子点-PAN配合物。通过紫外可见光谱、傅里叶变换红外光谱和圆二色光谱对配合物进行了表征。量子化学TDDFT计算的圆二色光谱再现了实验观察到的信号模式，其源于Lcys或Dcys以及PAN分子与量子点表面上的同一个锌原子结合。与由半胱氨酸分子诱导的普通量子点手性相比，所得配合物具有较大的圆二色性。在手性量子点-PAN配合物中，Lcys和Dcys配体的圆二色信号模式相同。
