We report the synthesis and photoluminescence (PL) properties of three compounds [C₂₁H₂₀N₃]₂[HPMo₁₂O₄₀] (1), [C₂₁H₂₀N₃]₃[PW₁₂O₄₀]∙4C₃H₇NO (2) and [C₂₁H₂₀N₃]₄[SiW₁₂O₄₀] (3) consisting of ethidium cation (3,8-diamino-5-ethyl-6-phenylphenanthridinium) and Keggin type polyoxometalates. Compounds 1, 2 and 3 have been characterized unambiguously by the single crystal X-ray diffraction studies. The binding studies of inorganic-organic hybrid compounds 1, 2 and 3 with CT-DNA (calf thymus DNA) have been carried out and monitored by UV–Vis- and emission-spectroscopy. The compounds 1 and 2 show fluorescence enhancement where as compound 3 with silicotungstate polyanion shows fluorescence quenching. The photoluminescence properties of three hybrid compounds arise due to the interaction of ethidium cation with DNA. We have demonstrated that the interaction between ethidium cation and CT-DNA is influenced by a particular type of polyoxometalate (POM) Keggin anion. The crystal structures show supramolecular interactions between the Keggin anion and ethidium cation. Compounds 1, 2 and 3 are further characterized by routine spectral analysis.

_{我们报道了三种化合物[C 21} H ₂₀ N ₃ ] ₂ [HPMo ₁₂ O ₄₀ ] ( 1 )、[C ₂₁ H ₂₀ N ₃ ] ₃ [PW ₁₂ O ₄₀ ]∙4C ₃的合成和光致发光(PL )性质H ₇ NO ( 2 ) 和[C ₂₁ H ₂₀ N ₃ ] ₄ [SiW ₁₂ O ₄₀ ] ( 3 )由乙锭阳离子(3,8-二氨基-5-乙基-6-苯基菲啶鎓)和Keggin型多金属氧酸盐组成。化合物1、2和3已通过单晶 X 射线衍射研究明确表征。无机-有机杂化化合物1、2和3与 CT-DNA（小牛胸腺 DNA）的结合研究已通过紫外可见光谱和发射光谱进行并监测。化合物1和2显示出荧光增强，而具有硅钨酸盐聚阴离子的化合物3显示出荧光猝灭。三种杂化化合物的光致发光特性是由于乙锭阳离子与 DNA 的相互作用而产生的。我们已经证明乙锭阳离子和 CT-DNA 之间的相互作用受到特定类型的多金属氧酸盐 (POM) Keggin 阴离子的影响。晶体结构显示了 Keggin 阴离子和乙锭阳离子之间的超分子相互作用。化合物1、2和3通过常规光谱分析进一步表征。