苝醌／富勒烯C60超分子与电子给体的电子转移作用

Photoinduced Electron Transfer between Perylenequinonoid/Fullerene C_(60) Supramolecule and Electron Donor

利用紫外-可见吸收光谱、瞬态吸收光谱及X射线衍射等方法研究了苝醌染料竹红菌素镁离子配合物(Mg2+-HA)与富勒烯C60的相互作用.结果表明,Mg2+-HA与C60在溶液和固体状态下都能够形成稳定的超分子.Mg2+-HA存在条件下,C60能够溶于多种极性溶剂,在二甲基亚砜(DMSO)中的溶解度能够达到1×10-4mol·L-1.作为超分子体系中的光捕获分子,Mg2+-HA能显著地提高C60与N,N-二甲基苯胺(DMA)的光诱导电子转移反应效率,生成的C60负离子自由基的电子自旋共振光谱(ESR)信号强度比未加入Mg2+-HA时增强了9倍左右.

The magnesium complex of hypocrellin A （Mg^2＋-HA） （a perylenequinonoid compound） and pristine fullerene C60 was used to construct supramolecular assemblies in solution and in the solid state. The assembly was characterized by UV-Vis, transient absorption spectroscopy, and powder X-ray diffraction （XRD）. The solubility of C60 in polar solvent improves significantly in the presence of Mg^2＋-HA. The solubility of C60 in dimethyl sulfoxide （DMSO） is 1×10^4 mol· L^-1 when C60 is allowed to complex with Mg^2＋-HA （4×10^4 mol ·L^-l）. Acting as an antenna molecule in the supramolecular system, Mg^2＋-HA remarkably enhances the photoinduced electron transfer efficiency between C60 and an electron donor, N,N-dimethylaniline （DMA）. The electron spin resonance （ESR） signal intensity of C60 increases 9-fold as strong as that in the absence of Mg^2＋-HA.