以2-吡咯甲酰肼与2,4-二羟基苯甲醛和2-羟基-3-甲氧基苯甲醛经缩合反应合成2,4-二羟基苯甲醛-2-吡咯甲酰腙C12H11N3O3（Ⅰ）和2-羟基-3-甲氧基苯甲醛-2-吡咯甲酰腙C13H15N3O4（Ⅱ），并利用红外光谱、元素分析、1H NMR、X射线单晶衍射和热重分析进行表征，结果表明晶体Ⅰ属单斜晶系，空间群为P21/c，Z=4，晶胞参数为a=1.2586（4）nm，b=0.8050（3）nm，c=1.1914（4）nm；晶体Ⅱ为正交晶系，空间群为P212121，Z=4，晶胞参数为a=0.4756（2）nm，b=1.2491（6）nm，c=2.2145（11）nm。热重结果显示，化合物Ⅰ和Ⅱ最大热分解峰分别出现在267.59和284.79 ℃，表观活化能分别为176.6和122.9 kJ/mol，表明化合物Ⅰ和Ⅱ具有较高的热稳定性。利用粘度实验和微量热实验研究了化合物Ⅰ和Ⅱ与CT-DNA的相互作用，均显示两种化合物均与CT-DNA发生了插入作用，且相互作用过程放热，焓变值分别为ΔH（Ⅰ）=4.67 kJ/mol和ΔH（Ⅱ）=4.40 kJ/mol。
Two hydrazone componds(E)-N'-(2,4-dihydroxybenzylidene)-pyrrole-2-carbohydrazide C12H11N3O3(Ⅰ) and (E)-N'-(2-hydroxy-3-methoxybenzylidene)-pyrrole-2-carbohydrazide C13H14N3O4(Ⅱ) have been synthesized from 2,4-dihydroxybenzaldehyde and 2-hydroxy-3-methoxybenzaldehyde with pyrrole-2-carbohydrazide, respectively. The compounds have been characterized by IR spectroscopy, elemental analysis, 1H NMR spectroscopy, single-crystal X-ray diffraction and thermogravimetric analysis. The crystal of compound Ⅰ belonged to monoclinic crystal lattice, space group P21/c, Z=4, with unit cell parameters a=1.2586(4) nm, b=0.8050(3) nm, c=1.1914(4) nm, and compound Ⅱ crystallized in the orthorhombic system, space group P212121, Z=4, with unit cell parameters a=0.4756(2) nm, b=1.2491(6) nm, c=2.2145(11) nm. The TG-DTG result shows that the compounds Ⅰ and Ⅱ display good thermal stability, the maximum decomposition peaks are at the temperature of 267.59 ℃ and 284.79 ℃, and their apparent activation energy values are 176.6 kJ/mol and 122.9 kJ/mol, respectively. The thermogenic curves of the compounds Ⅰ and Ⅱ reacting with calf thymus DNA(CT-DNA) measured by viscosity and microcalorimetry, indicate that the interactions of compounds Ⅰ and Ⅱ with CT-DNA belong to the intercalation mode, and the interacting processes are all endothermic, their enthalpies are ΔH(Ⅰ)=4.67 kJ/mol and ΔH(Ⅱ)=4.40 kJ/mol, respectively.
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