N-烷基-N-甲基吡咯烷鎓阳离子已用于离子液晶的设计,包括新型的含铀金属致发光剂。制备了与溴化物,双(三氟甲基磺酰基)酰亚胺,四氟硼酸根,六氟磷酸根,硫氰酸根,四(2-壬基三氟乙酰丙酮根)乙酸酯(III)和四溴呋喃基抗衡阴离子的吡咯烷鎓盐。对于溴化物盐和四溴呋喃基化合物,烷基C n H 2 n +1的链长从8到20个碳原子不等(n= 8,10–20)。这些化合物表现出丰富的介晶行为:观察到高度有序的近晶相(晶体近晶E相和罕见的晶体近晶T相),近晶A相和六方柱状相,具体取决于链长和阴离子。这项工作可以更好地洞悉晶体近晶T相的性质和形成,以及对这种高度有序相的外观的分子要求。在详细的粉末X射线衍射实验的基础上,并结合现有文献,对这种不常见的四方中间相进行了详尽的讨论。提出了用于近晶层内分子自组装的结构模型。另外,还研究了含有金属络合物阴离子的化合物的光物理性质。对于含铀的液晶元,可以通过将它们
我们报告使用廉价的单季铵盐N-鲸蜡基-N-甲基吡咯烷鎓(C 16 NMP)作为介孔原到合成凝胶中一步合成丝光沸石纳米棒的过程。少量C 16 NMP的存在导致形成沿c轴取向的0.6–1μm棒状晶体,且具有较高的中孔体积(0.12 cm 3 g -1)和外表面积(〜90 m)与块状丝光沸石相比为2 g -1)。酸度表征表明存在C 16丝光沸石形成过程中的NMP导致铝在沸石骨架中的重新分布:侧袋(8MR通道)中的布朗斯台德酸位点数量增加,而12MR主通道中的布朗斯台德酸位点却增加了。由于这些后面的酸性位点是烷烃双官能加氢转化过程中涉及烯烃中间体转化的位点,因此与仅用钠制备的本体MOR相比,用C 16 NMP制备的优化分级丝光沸石显示出更理想的加氢裂化选择性。
[C16MPy]AlCl3Br: an efficient novel ionic liquid for synthesis of novel 1,2,4-triazolidine-3-thiones in water
作者:Jayavant D. Patil、Dattaprasad M. Pore
DOI:10.1039/c3ra46916f
日期:——
4-triazolidine-3-thiones in water at ambient temperature. A variety of aldehydes undergo smooth reaction with thiosemicarbazide and substitutedthiosemicarbazides. In the case of substitutedthiosemicarbazides the corresponding 1,2,4-triazolidine-3-thiones are obtained as products instead of 1,3,4-oxadiazoles. A broad variety of functional groups are tolerated and a large number of substrates can be applied
Dialkylamino and nitrogen heterocyclic analogues of hexadecylphosphocholine and cetyltrimetylammonium bromide: Effect of phosphate group and environment of the ammonium cation on their biological activity
dialkylamino and nitrogen heterocyclic analogues of hexadecylphosphocholine and cetyltrimethylammonium bromide have been synthesized. The prepared compounds exhibit significant cytotoxic, antifungal and antiprotozoal activities. Alkylphosphocholines possess higher antifungal activity against Candida albicans in comparison with quaternary ammonium compounds. However, quaternary ammonium compounds exhibit
Mordenite Nanorods Prepared by an Inexpensive Pyrrolidine‐based Mesoporogen for Alkane Hydroisomerization
作者:Aleksei Bolshakov、Douglas E. Romero Hidalgo、Arno J. F. van Hoof、Nikolay Kosinov、Emiel J. M. Hensen
DOI:10.1002/cctc.201900298
日期:2019.6.19
during mordeniteformation leads to a redistribution of aluminum in the zeolite framework: the amount of Brønsted acid sites in the side‐pockets (8MR channels) is increased at the expense of those in the 12MR main channels. As these latter acid sites are the ones involved in the conversion of alkene intermediates in bifunctional hydroconversion of alkanes, an optimized hierarchical mordenite prepared
我们报告使用廉价的单季铵盐N-鲸蜡基-N-甲基吡咯烷鎓(C 16 NMP)作为介孔原到合成凝胶中一步合成丝光沸石纳米棒的过程。少量C 16 NMP的存在导致形成沿c轴取向的0.6–1μm棒状晶体,且具有较高的中孔体积(0.12 cm 3 g -1)和外表面积(〜90 m)与块状丝光沸石相比为2 g -1)。酸度表征表明存在C 16丝光沸石形成过程中的NMP导致铝在沸石骨架中的重新分布:侧袋(8MR通道)中的布朗斯台德酸位点数量增加,而12MR主通道中的布朗斯台德酸位点却增加了。由于这些后面的酸性位点是烷烃双官能加氢转化过程中涉及烯烃中间体转化的位点,因此与仅用钠制备的本体MOR相比,用C 16 NMP制备的优化分级丝光沸石显示出更理想的加氢裂化选择性。
Liquid Crystalline Phases of the Amphiphilic Ionic Liquid <i>N</i>-Hexadecyl-<i>N</i>-methylpyrrolidinium Bromide Formed in the Ionic Liquid Ethylammonium Nitrate and in Water
作者:Mingwei Zhao、Yanan Gao、Liqiang Zheng
DOI:10.1021/jp103728x
日期:2010.9.9
The phase behavior of a surfactant-like ionic liquid, N-hexadecyl-N-methylpyrrolidinium bromide (C16MPB), was studied in both water and a room temperature ionic liquid, ethylammonium nitrate (EAN). Polarized optical microscopy (POM) and small-angle X-ray scattering (SAXS) measurements were employed to investigate the phase behavior of the two systems and to determine which lyotropic liquid crystalline (LC) phases were formed. With increasing C16MPB concentration, an isotropic solution phase, a hexagonal (H-1) phase, and a cubic phase (V-2) are all present in either EAN or H2O. The structural parameters of the H-1 phase were calculated from SAXS patterns, which show the structural changes as a function of the amount of C16MPB. The rheological results reveal that the H-1 phase constructed by C16MPB in EAN displays a typical Maxwell behavior, whereas the H-1 phase formed by C16MPB in water shows a gel-like behavior, unlike traditional cationic surfactants. POM and differential scanning calorimetry (DSC) results demonstrate that the lyotropic LC phase in EAN has a higher thermal stability than that formed in H2O, which may be important to extend the applications of the LC phase.