红色烟火着色剂MOF[Sr2(DTDA)(H2O)6]n的制备与性能

以富氮羧酸类分子2,2'-(3,3'-偶氮-双(1H-1,2,4-三唑-5基))二乙酸(H2DTDA)与氢氧化锶八水合物为原料,在水热条件下制备了一种金属有机框架(MOF)结构的新型红色烟火着色剂Sr_2(DTDA)(H_2O)_6]_n(1);采用傅里叶变换红外光谱(FT-IR)、X射线单晶衍射(XRD)、粉末X射线单晶衍射(PXRD)和元素分析等对化合物结构进行了表征;采用热重法(TG)-差示扫描量热法(DSC)、BAM标准法测试了化合物1的热性能和感度性能;设计了烟火剂配方,对化合物1应用于红色烟火着色剂的可行性进行分析。结果表明,化合物1是一种具有二维空间结构的MOF材料,其层状结构之间存在丰富的氢键作用;放大合成的水热实验同样可以得到高纯度的化合物1;撞击感度为80 J,摩擦感度 360 N;化合物1可作为红色着色剂应用于烟火剂配方中。

Preparation and Properties of Red Pyrotechnic Colorant MOF [Sr2(DTDA)(H2O)6]n

A novel red pyrotechnics colorant MOF Sr₂(DTDA)(H₂O)₆]_n (1) was synthesized from one high-nitrogen content ligand with carboxylic acid, 2,2"-(3,3"-azo-bis(1H-1,2,4-triazol-5-yl)) diacetic acid (H₂DTDA) and strontium hydroxide octahydrate under hydrothermal condition. The structure of compound 1 was characterized by Fourier transform infrared (FT-IR), single crystal X-ray diffraction (XRD), powder X-ray diffraction (PXRD) and elemental analysis. Its thermal decomposition temperatures were measured by thermogravimetry (TG) and differential scanning calorimetry (DSC), and the sensitivities were tested by BAM standard methods. A pyrotechnic formulation was designed, and the feasibility of applying compound 1 to a red pyrotechnic colorant was analyzed. It is showed that the structure of compound 1 is two-dimensional (2D) structure and there are hydrogen bonds between layers. Compound 1 can also be obtained by a large-scale hydrothermal experiment. The low impact sensitivity (IS = 80 J) and friction sensitivity (FS > 360 N) indicate that compound 1 is an insensitive energetic material and can be used as a red colorant in pyrotechnic formulation.