Solvent-free Synthesis, Crystal Structure and Thermal Stability of Ionic Liquid 1-Hexadecyl-3-methylimidazolium Bromide

Ionic liquid 1-hexadecyl-3-methylimidazolium bromide [C16mim]Br was synthesized 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）, 4 mm 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） A, α = 94.375, β = 91.500, γ = 101.999°, Z = 2, V = 1145.2（5） A3, C20H41BrN2O, Mr = 405.46, Dc = 1.176 Mg/m3, μ = 1.804 mm^-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.     

KZnF3：Eu的水热合成及其光谱性质

采用中温水热法合马了立方钙钛矿单相ＫＺｎＦ３及ＫＺｎＦ３：Ｅｕ，通过ＳＥＭ观察了产物形态．ＸＰＳ测定结果表明，产物含氧量不高。荧光光谱及ＥＳＲ谱表明，ＫＺｎＦ３：Ｅｕ体系中Ｅｕ＾２＋与Ｅｕ＾３＋共存，进一步讨论了不等价取代中的电荷补偿途径。     

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在离子液体中,4-氨基安替比林和取代-3-甲酰基色酮反应,合成了4种含色酮环的Schiff碱(其中2种为新化合物),收率77%～94%,其结构经1H NMR和巩表征.