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以对硝基苯胺为原料,通过溴代、去氨基、硝基还原和重氮耦合反应合成了3’,5’-二溴-2,4-二羟基偶氮苯,利用FT-IR,1H NMR,13C NMR,MS,元素分析和X射线单晶衍射等方法对标题化合物的结构进行了表征。X射线单晶衍射结果表明,该晶体属于单斜晶系,P1 21/c1空间群,晶胞参数为:a=2.0107(3)nm,b=0.42111(7)nm,c=0.16175(3)nm,β=94.408(2)°,V=1.3655(4)nm3,Z=4,Dc=1.897 g/cm3,μ=5.941 mm-1,F(000)=760,R1=0.0762,wR2=0.2127[I>2σ(I)],标题偶氮苯分子以E型异构体存在。其光致异构性能研究表明,在紫外光的照射下,标题分子可实现E-Z异构转化,其稀溶液E-Z光致异构转化遵循一级动力学方程ln[(A0-Aeq)/(At-Aeq)]=kt×t。
Using p-nitroaniline as raw material, 3 ’, 5’-dibromo-2,4-dihydroxyazobenzene was synthesized by bromination, deamination, nitro reduction and diazo coupling reaction. The structures of the title compounds were characterized by NMR, 13C NMR, MS, elemental analysis and X-ray single crystal diffraction. The results of X-ray single crystal diffraction show that the crystal belongs to the monoclinic space group P1 21 / c1 with unit cell parameters of a = 2.0107 (3) nm, b = 0.42111 (7) nm and c = 0.16175 (3) nm, Z = 4, Dc = 1.897 g / cm3, μ = 5.941 mm-1, F (000) = 760, R1 = 0.0762, wR2 = 0.2127 [I> 2σ (I)], the title azobenzene molecule exists as an E-type isomer. The photochemical isomerization studies show that the title molecules can be converted to EZ isomerization under the irradiation of UV light. The photoisomerization of EZ under dilute solution follows the first-order kinetic equation ln [(A0-Aeq) / (At -Aeq)] = kt × t.