论文部分内容阅读
Ionic liquid 1-hexadecyl-3-methylimidazolium bromide [C16mim]Br was synthesi-zed by solvent-free alkylation of N-methylimidzole with hexadecyl bromide.A large transparent single crystal of 1-hexadecyl-3-methylimidazolium bromide monohydrate([C16mim]Br·H2O),4mm in length,was firstly obtained in the water-trichloromethane-toluene growth system(Vwater:Vtrichloromethane:Vtoluene=0.1:1:2).The crystal structure was determined by single-crystal X-ray diffraction method.It crystallizes in the triclinic system,space group P1,with a=5.4962(15),b=7.839(2),c=27.279(8) ,α=94.375,β=91.500,γ=101.999°,Z=2,V=1145.2(5) 3,C20H41BrN2O,Mr=405.46,Dc=1.176 Mg/m3,μ=1.804mm-1,F(000)=436,the final R=0.0523 and wR=0.1345.The 3D supramolecular structure is constructed through weak interactions between imidazolium cations,Br-anions and lattice water molecules.The long alkyl chain to the imidazolium ring and lattice water molecules play an important role in the self-assembly process.Moreover,it is proposed that [C16mim]Br in water has aggregation behavior and the possible self-assembled structure is the interdigitated pattern.Finally,thermal stability of [C16mim][Br]·H2O was also studied by DSC and TGA analysis.
A large transparent single crystal of 1-hexadecyl-3-methylimidazolium bromide monohydrate ([C16mim] Br) was synthesized by a solvent-free alkylation of N-methylimidzole with hexadecyl bromide Br · H2O), 4 mm in length, was obtained in the water-trichloromethane-toluene growth system (Vwater: Vtrichloromethane: Vtoluene = 0.1: 1: 2). The crystal structure was determined by single-crystal X-ray diffraction method. It crystallizes in the triclinic system space group P1 with a = 5.4962 (15), b = 7.839 (2), c = 27.279 8, α = 94.375, β = 91.500, γ = 101.999 °, Z = 2 , V = 1145.2 (5) 3, C20H41BrN2O, Mr = 405.46, Dc = 1.176 Mg / m3, μ = 1.804mm- 1, F (000) = 436, the final R = 0.0523 and wR = 0.1345.The 3D supramolecular structure is constructed through the interaction of weak interactions between imidazolium cations, Br-anions and lattice water molecules. The long alkyl chain to the imidazolium ring and lattice water molecules play an important role in the self-assembly process. Moreover, it is propo sed that [C16mim] Br in water has aggregation behavior and the possible self-assembled structure is the interdigitated pattern. Finaally, thermal stability of [C16mim] [Br]. H2O was also studied by DSC and TGA analysis.