Citation:
MAO Xinjie, LIU Xiangrong, ZHAO Shunsheng, YANG Zaiwen, YAN Sen. Synthesis, Crystal Structures and Calf Thymus DNA Binding of Acylhydrazone Bearing Pyrrole Ring[J]. Chinese Journal of Applied Chemistry,
;2016, 33(8): 923-931.
doi:
10.11944/j.issn.1000-0518.2016.08.150398
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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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Keywords:
- hydrazone,
- crystal structures,
- thermal stability,
- calf thymus DNA
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