Synthesis, structure and Hirshfeld surface analysis of a series of novel low melting salts without alkyl groups
作者:Shan-Shan Yu、Hai-Rong Zhao、Jian-Han Shi、Hui Zhang、Hai-Bao Duan
DOI:10.1039/d1ce00933h
日期:——
Schiff base cations surround the anion to form molecular stacks. There exist H⋯I hydrogen bond contacts between the cations and I3− anion in the eight compounds, and H⋯H interactions are the main force between the cations. The melting point of crystal 1 is the lowest with 64 °C among the eight compounds. 3 and 4 show higher Tm, ΔHfus and ΔSfus values. The substituent group of the Schiff base cation in
八种离子对化合物,[1-APy]I 3 ( 1 ), [ o -FBz-1-APy]I 3 ( 2 ), [ o -ClBz-1-APy]I 3 ( 3 ), [ o - BrBz-1-APy]I 3 ( 4 ), [ m -FBz-1-APy]I 3 ( 5 ), [ m -ClBz-1-APy]I 3 ( 6 ), [ m -BrBz-1-APy ]I 3 ( 7 ) 和 [ m -IBz-1-APy]I 3 ( 8),在结构上被合成和表征。的熔点1,2和5-8是低于90℃,因此这些化合物可以用作离子液体。1-8晶体结构的一个共同特征是无机组分形成线性 I 3 -阴离子,非平面希夫碱阳离子围绕阴离子形成分子堆叠。8种化合物的阳离子与I 3 -阴离子之间存在H⋯I氢键接触,H⋯H相互作用是阳离子间的主要作用力。在八种化合物中,晶体1的熔点最低,为 64 °C。3和图4显示了更高的T m、Δ