Powder sample of a terbium based metal‐organic complex (MOC) [Tb₂(pydcH)₆]⋅3H₂O {H₂pydc= 2,6‐Pyridinedicarboxylic acid}, 1, were synthesized by simple solvent evaporation method in water medium. Powder X‐ray diffraction data of complex 1 confirmed a molecular complex of tricapped trigonal prismatic Tb³⁺ ion with a free carboxylic acid site of each H₂pydc ligands by comparing with the single crystal X‐ray diffraction data of isomorphous europium based compound, [Eu₂(pydcH)₆]⋅3H₂O. Compound 1 showed very strong visible green luminescence which was sensitive towards nitro explosives; and interestingly, the sensitivity was dependent on the solvent used. The luminescence was emitted by ligand sensitized Tb metal centre of compound 1 and was quenched so quickly and efficiently that an instant colour change from visible green to colourless was observed by naked eye. The experiments were done for the detection of nitro‐explosive materials such as 2,4,6‐trinitrophenol (TNP), 2,4‐dinitrophenol (2,4‐DNP), 2,4‐dinitro toluene (DNT), 1,3‐dinitro benzene (DNB), 4‐nitrotoluene (NT) and nitro benzene (NB) in water (H₂O), methanol (MeOH), acetonitrile (CH₃CN), and tetrahydrofuran (THF) solvents. Mechanism of the luminescence quenching behaviour in different solvents was successfully explained by combined effect of resonance energy transfer, absorption of excitation light and the possibility of electron transfer. Experimental results were also supported by DFT calculations.

中文翻译：

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Ter基金属有机配合物对硝基炸药的溶剂依赖性发光传感

基于金属的有机络合物（MOC）一个铽的粉末样品[TB ₂（pydcH）₆ ]⋅3H ₂ ö{H ₂ pydc = 2,6-吡啶二羧酸}，1，通过简单的溶剂蒸发法在水介质中合成。配合物1的粉末X射线衍射数据通过与同构euro基化合物的单晶X射线衍射数据进行比较，证实了三键三角柱状Tb ³⁺离子与每个H ₂ pydc配体的自由羧酸位点的分子复合物， [欧盟₂（pydcH）₆ ]⋅3H ₂ O.化合物1表现出非常强的可见绿色发光，对硝基炸药敏感；有趣的是，灵敏度取决于所使用的溶剂。发光是由化合物1的配体敏化的Tb金属中心发出的，并且如此迅速而有效地淬灭，以致用肉眼观察到了从可见绿色到无色的瞬时颜色变化。该实验用于检测硝基爆炸性物质，例如2,4,6-三硝基苯酚（TNP），2,4-二硝基苯酚（2,4-DNP），2,4-二硝基甲苯（DNT），1水中（H ₂ O），甲醇（MeOH），乙腈（CH ₃）中的3-二硝基苯（DNB），4-硝基甲苯（NT）和硝基苯（NB）CN）和四氢呋喃（THF）溶剂。通过共振能量转移，激发光吸收和电子转移的可能性的综合作用，成功地解释了在不同溶剂中发光猝灭行为的机理。DFT计算也支持了实验结果。