TY - JOUR A1 - Aloni, Sapir Shekef A1 - Perovic, Milena A1 - Weitman, Michal A1 - Cohen, Reut A1 - Oschatz, Martin A1 - Mastai, Yitzhak T1 - Amino acid-based ionic liquids as precursors for the synthesis of chiral nanoporous carbons JF - Nanoscale Advances N2 - The synthesis of chiral nanoporous carbons based on chiral ionic liquids (CILs) of amino acids as precursors is described. Such unique precursors for the carbonization of CILs yield chiral carbonaceous materials with high surface area (approximate to 620 m(2) g(-1)). The enantioselectivities of the porous carbons are examined by advanced techniques such as selective adsorption of enantiomers using cyclic voltammetry, isothermal titration calorimetry, and mass spectrometry. These techniques demonstrate the chiral nature and high enantioselectivity of the chiral carbon materials. Overall, we believe that the novel approach presented here can contribute significantly to the development of new chiral carbon materials that will find important applications in chiral chemistry, such as in chiral catalysis and separation and in chiral sensors. From a scientific point of view, the approach and results reported here can significantly deepen our understanding of chirality at the nanoscale and of the structure and nature of chiral nonporous materials and surfaces. Y1 - 2019 U6 - https://doi.org/10.1039/c9na00520j SN - 2516-0230 VL - 1 IS - 12 SP - 4981 EP - 4988 PB - Royal Society of Chemistry CY - Cambridge ER - TY - JOUR A1 - Perovic, Milena A1 - Aloni, Sapir Shekef A1 - Mastai, Yitzhak A1 - Oschatz, Martin T1 - Mesoporous carbon materials with enantioselective surface obtained by nanocasting for selective adsorption of chiral molecules from solution and the gas phase JF - Carbon N2 - Separation of enantiomers is an everlasting challenge in chemistry, catalysis, and synthesis of pharmaceuticals. The design and fabrication of chiral adsorbent materials is a promising way to increase the surface area of chiral information, as well as to maximize the available surface for the adsorption of one enantiomer. Porous materials such as silica or metal-organic-frameworks are established compounds in this field, due to their well-defined surface structure and ease of functionalization with chiral groups. As another class of porous materials, carbons provide the advantages of high thermal and chemical stability, resistance against moisture, electrical conductivity, and widely tunable pore size. Although they are well established in many adsorption-related applications, carbons received far less attention in enantioselective adsorption processes because the controlled functionalization of their surface is rather difficult due to the chemically heterogeneous atoms in the network. A suitable approach to overcome this limitation is the synthesis of chiral carbons directly from chiral precursors. So far, chiral carbons synthesized from chiral precursors used salt-templating as a way of introducing porosity, which resulted in mainly microporous materials or materials with broad pore size distribution. In the present study, the possibility of combining nanocasting as an alternative templating approach with chiral ionic liquids as a carbon precursor is demonstrated. Chiral recognition is measured in the gas phase, by adsorption of chiral gas, as well as in the solution, by using isothermal titration calorimetry. (C) 2020 Elsevier Ltd. All rights reserved. KW - mesoporous carbon KW - chiral carbon KW - porous materials KW - enantiomers KW - separation KW - chiral recognition KW - adsorption Y1 - 2020 U6 - https://doi.org/10.1016/j.carbon.2020.08.010 SN - 0008-6223 SN - 1873-3891 VL - 170 SP - 550 EP - 557 PB - Elsevier CY - Oxford ER -