O,O '-二(4-甲苯基)二硫代磷酸-N,N-二乙铵的晶体结构、热稳定性及缓蚀性

摘要

合成了O,O＇-二(4-甲苯基)二硫代磷酸-N,N-二乙铵([ Et2NH2][(4-MeC6H4O)2PS2],NOP),采用元素分析、红外光谱、核磁共振谱和单晶X射线衍射测试技术对其结构进行了表征,同时研究了NOP的热稳定性和缓蚀性.NOP晶体属单斜晶系,P21/n空间群,晶胞参数为:a=1.424 1 (3) nm,b=2.008 7(4) nm,c=1.436 6(3) nm,V=3.959 9(15) nm3,Dc=1.286 Mg/m3,Z=8,F(000)=1 632,μ(MoKα)=0.360 mm-1,S=1.001,(△/r)max=0.001,R1=0.0776,wR2=0.174 9(I＞2σ(I)).NOP的不对称结构单元中包括2个独立的子单元,2个子单元之间通过N-H……S氢键形成了一维链结构.在H2SO4溶液中,NOP能有效抑制Q235钢的腐蚀,是一种抑制阳极反应为主的高效混合型缓蚀剂；NOP在Q235钢表面的吸附符合Langmuir吸附等温式,属自发进行的物理和化学吸附.%[Et2NH2][ (4-MeC6H4O)2PS2] ( N, N-diethylammonium 0, O'-di ( 4-methylphenyl ) dithiophosphate,NOP) was synthesized and characterized by elemental analysis, IR, TG-DSC, and single crystal X-ray diffraction analysis. The thermal stability and corrosion inhibition were investigated. The crystallographic structure analysis reveals that the title compound crystallizes in monoclinic system, P 21/n space group, a = 1.4241 (3) nm, 6=2.0087(4) nm, c = 1. 4366(3) nm, V = 3. 9599(15) nm2, Dc = 1.286 Mg/m3 Z = 8, F(000) = 1632, μ(MoKa) =0.360 mm-1, S = 1.001, (△/σ)max =0.001, and R1, =0.0776, Wr2 =0. 1749(I > 2σ(I)). There are two independent subunits in the asymmetric structure unit of NOP, and infinite one-dimensional chain structure is formed via N-H‥‥S hydrogen bonds between the subunits. The corrosion inhibition study showed that the NOP could effectively restrain corrosion of Q235 steel in H2SO4 solution. It was shown that the adsorption of NOP on the Q235 steel surface is consistent with the Langmuir adsorption isotherm, and the corrosion inhibition depends on both physical and chemical sorptions. CCDC:813309