期刊
JOURNAL OF PHYSICS-CONDENSED MATTER
卷 18, 期 46, 页码 10377-10390出版社
IOP PUBLISHING LTD
DOI: 10.1088/0953-8984/18/46/006
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The phases, ion crystal packing and thermal properties of the N-alkylN- methylpyrrolidinium and piperidinium bis(trifluoromethanesulfonyl) imide (PYR1RTFSI and PIP1RTFSI (subscript R = 1 for methyl and 2 for ethyl), respectively) salts are compared using powder and single-crystal x-ray diffraction (XRD) and differential scanning calorimetry (DSC). The crystal structure of PIP12TFSI has been determined at 123 K. The salt crystallizes in the triclinic space group P1 with Z = 8. Structural data are also reported for PYR11TFSI at 153 K and PIP12TFSI at 223 K. PIP11TFSI has identical ion crystal packing to the analogous pyrrolidinium salt PYR11TFSI. Since increasing the cation alkyl chain length to propyl or butyl (R = 3 or 4) reduces the melting point of the salts below room temperature, this study may provide valuable insight into why these pyrrolidinium and piperidinium salts form room-temperature ionic liquids.
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