Zhang Yanqiang, Zhang Suojiang, Lu Xingmei, Zhou Qing, Fan Wei, Zhang XiangPing
Key Laboratory of Green process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, P.O. Box 353, Beijing, 100080, China.
Chemistry. 2009;15(12):3003-11. doi: 10.1002/chem.200801184.
A series of 20 dual amino-functionalised phosphonium ionic liquids, (3-aminopropyl)tributylphosphonium amino acid salts ([aP(4443)][AA], in which AA = Ala, Arg, Asn, Asp, Cys, Gln, Glu, Gly, His, Ile, Leu, Lys, Met, Phe, Pro, Ser, Thr, Trp, Tyr and Val), has been prepared. Their physicochemical properties, such as density, viscosity, glass transition and thermal decomposition temperatures and conductivity, have been determined. In particular, the [aP(4443)][AA] ionic liquids (ILs) have low glass transition temperatures ranging from -69.7 to -29.6 degrees C and high decomposition temperatures (all above 200 degrees C). The effects of the variation of the structure of AA on the above physicochemical properties are discussed. Furthermore, the CO(2) absorption of [aP(4443)][Gly], [aP(4443)][Ala], [aP(4443)][Val] and [aP(4443)][Leu], taken as examples, was investigated. It was found that the supported absorption of CO(2) by the [aP(4443)][AA] ILs almost reaches equilibrium within 80 min, the chemical absorption of CO(2) by the [aP(4443)][AA] ILs approaches 1 mol CO(2) per mol ionic liquid (twice that reported before) and the [aP(4443)][AA] ILs can be repeatedly recycled for CO(2) uptake.
已制备了一系列20种双氨基官能化的鏻离子液体，即（3-氨丙基）三丁基鏻氨基酸盐（[aP(4443)][AA]，其中AA = Ala、Arg、Asn、Asp、Cys、Gln、Glu、Gly、His、Ile、Leu、Lys、Met、Phe、Pro、Ser、Thr、Trp、Tyr和Val）。已测定了它们的物理化学性质，如密度、粘度、玻璃化转变温度、热分解温度和电导率。特别地，[aP(4443)][AA]离子液体（ILs）具有-69.7至-29.6℃的低玻璃化转变温度和高分解温度（均高于200℃）。讨论了AA结构变化对上述物理化学性质的影响。此外，以[aP(4443)][Gly]、[aP(4443)][Ala]、[aP(4443)][Val]和[aP(4443)][Leu]为例，研究了其对CO₂的吸收情况。发现[aP(4443)][AA]离子液体对CO₂的负载吸收在80分钟内几乎达到平衡，[aP(4443)][AA]离子液体对CO₂的化学吸收接近每摩尔离子液体1摩尔CO₂（是之前报道的两倍），并且[aP(4443)][AA]离子液体可用于CO₂吸收的重复循环利用。
