Could X-Ray Analysis Explain for the Differing Antimicrobial and Antioxidant Activity of Two 2-Arylamino-3-Nitro-Coumarins?
作者:Niko S. Radulović、Goran A. Bogdanović、Polina D. Blagojević、Vidosav S. Dekić、Rastko D. Vukićević
DOI:10.1007/s10870-010-9918-0
日期:2011.4
X-Ray analyses of 4-(naphthalen-1-ylamino)-3-nitro-chromen-2-one and 3-nitro-4-phenylamino-chromen-2-one showed that the mentioned compounds crystallize in the space groups P1- (triclinic crystal system; unit cell parameters: a = 8.087(2) Å, b = 9.241(3) Å, c = 10.911(3) Å, α = 93.77(3)°, β = 102.51(3)°, γ = 106.44(2)°, V = 756.4(4) Å3 and Z = 2) and P212121 (orthorhombic crystal system; unit cell parameters: a = 4.9274(9) Å, b = 14.725(3) Å, c = 17.866(4) Å, α = β = γ = 90°, V = 1296.3(5) Å3 and Z = 4), respectively. The analyses of crystal structures and gas phase conformations, inferred from single X-ray crystallographic and molecular modeling experiments, respectively, showed that the changes in π delocalization of the farmacoactive formal 3-amino-2-nitro-acrylic acid derivatives might explain the observed significant difference of the antimicrobial and antioxidant activities and spectral properties of two 4-arylamino-3-nitro-coumarin derivatives. In this work we considered the possibility that the changes in the π-delocalization of the pharmacoactive 4-(naphthalene-1-ylamino)- and 4-phenylamino-3-nitro-chromen-2-ones, inferred from X-ray analysis, might explain significant alterations of the antioxidant and antimicrobial activities (and spectral ones) of two coumarin derivatives.
对4-(萘-1-基氨基)-3-硝基-查尔酮-2-酮和3-硝基-4-苯基氨基-查尔酮-2-酮的X射线分析显示,所提及的化合物分别以P1-(三斜晶系;单元格参数:a = 8.087(2) Å,b = 9.241(3) Å,c = 10.911(3) Å,α = 93.77(3)°,β = 102.51(3)°,γ = 106.44(2)°,V = 756.4(4) ų,Z = 2)和P212121(正交晶系;单元格参数:a = 4.9274(9) Å,b = 14.725(3) Å,c = 17.866(4) Å,α = β = γ = 90°,V = 1296.3(5) ų,Z = 4)结晶。由单晶X射线晶体学和分子模型实验推断的晶体结构和气相构象分析显示,药用活性形式3-氨基-2-硝基-丙烯酸衍生物中π去局域化的变化可能解释了两个4-芳基氨基-3-硝基-香豆素衍生物的抗菌和抗氧化活性及光谱特性的显著差异。在这项工作中,我们考虑到,基于X射线分析推断的药用活性4-(萘-1-基氨基)-和4-苯基氨基-3-硝基-查尔酮-2-酮的π去局域化变化可能解释了两个香豆素衍生物抗氧化和抗菌活性(以及光谱特性)的显著变化。