zeolites and to understand the crystallization process with the new template. Very interestingly, the crystallization of RTH zeolite with the new template takes a very short time (12 h at 130 °C and 50 min at 240 °C) compared with conventional RTH zeolite synthesis reported in the literature (72 h at 130 °C). Theoretical calculations show that this novel organic template has lower interaction energies
2,6-甲基-N-甲基吡啶鎓作为一种新型的有机模板,被用于合成SiO 2 / Al 2 O 3比为17.6的RTH硅铝酸盐沸石。起始凝胶中2,6-甲基-N-甲基吡啶鎓模板的数量,Na 2 O / SiO 2比,SiO 2 / Al 2 O 3比和H 2 O / SiO 2比显着影响结晶。 RTH沸石。几种分析方法,例如XRD,SEM,N 2吸附,TG-DTA,DRIFT和NMR被用于表征所获得的RTH沸石并了解新模板的结晶过程。非常有趣的是,与文献中报道的常规RTH沸石合成(130°C时72 h)相比,使用新模板进行RTH沸石的结晶仅需很短的时间(130°C时12 h,240°C时50 min)。 。理论计算表明,这种新颖的有机模板具有比先前文献中报道的有机模板低的用于沸石笼状空间填充的相互作用能,从而导致更强的结构指向性。动力学结果表明,这种新型有机模板的活化能远低于传统模板。3- SC
Twisted Push–Pull Alkenes Bearing Geminal Cyclicdiamino and Difluoroaryl Substituents
作者:Abhinanda Kundu、Shubhadeep Chandra、Debdeep Mandal、Nicolás I. Neuman、Alok Mahata、Srinivas Anga、Hemant Rawat、Sudip Pal、Carola Schulzke、Biprajit Sarkar、Vadapalli Chandrasekhar、Anukul Jana
DOI:10.1021/acs.joc.1c01201
日期:2021.9.17
structures of these molecules reveal a notable elongation of the central C–C bond and a twisted geometry in the alkene motif. Absorption properties were investigated with UV–vis spectroscopy. The redox properties of the twisted push–pull alkenes were probed with electrochemistry as well as UV–vis/NIR and EPR spectroelectrochemistry, while the electronic structures were computationally evaluated and validated
作者:Fenglou Gu、Huilong Dong、Youyong Li、Zhihong Si、Feng Yan
DOI:10.1021/ma402334t
日期:2014.1.14
terms of their alkaline stability. The effect of the N3-substituent on the alkaline stability was studied by quantitative 1H NMR spectra and density functional theory (GGA-BLYP) calculations. The isopropyl substituted imidazolium cation ([DMIIm]+) with the highest LUMO energy value exhibited the highest alkaline stability in aqueous NaOH. The [DMIIm]+ cation also exhibited higher alkaline stability than
合成了具有各种N3取代基(包括甲基,丁基,庚基,十二烷基,异丙基和二苯基甲基)的咪唑阳离子,并对其碱性稳定性进行了研究。通过定量1 H NMR光谱和密度泛函理论(GGA-BLYP)计算研究了N3取代基对碱稳定性的影响。具有最高LUMO能量值的异丙基取代的咪唑鎓阳离子([DMIIm] +)在NaOH水溶液中具有最高的碱稳定性。在CD 3 OD / D 2中,[DMIIm] +阳离子还比季铵阳离子苄基三甲基铵([BTMA] +)具有更高的碱稳定性。O NaOH溶液在高温下。该观察结果启发了基于[DMIIm] +的碱性阴离子交换膜(AEMs)的制备,该膜在碱性溶液中显示出较高的碱性稳定性。
A bicyclic imidazolium ionic liquid (4d), [b-4C-im][Br], was found to be highly effective not only for promoting PCR of GC-rich DNA by minimizing non-specific amplification, but also for facilitating PCR of normal-GC DNA under mild conditions.
Convenient syntheses of bulky group containing imidazolium ionic liquids
作者:Neeraj Kumar、Rahul Jain
DOI:10.1002/jhet.751
日期:2012.3
We report syntheses of bulky group containing imidazolium based ionic liquids. The bulky groups were introduced at N‐1, C‐2, and N‐3 positions of the imidazole ring using convenient methodologies. J. Heterocyclic Chem., (2012).