Solid-state H and C NMR studies of novel ionic rotator-crystals of [NEtMeR][BEt] (R = Pr, Bu. x = 1, 2).
Four new ionic rotator-crystals of [NEtMeR][BEt] (R = Pr, Bu; x = 1, 2) were observed. Rotator crystals (two-dimensional plastic crystals) are mesophases between solid and isotropic liquid phases. Solid-state H and C nuclear magnetic resonance (NMR) measurements revealed that the ellipsoidal cations...
| Publicado en: | Zeitschrift für Naturforschung Section A: A Journal of Physical Sciences Vol. 77; no. 9; pp. 899 - 909 |
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| Autores principales: | , |
| Formato: | Artículo |
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De Gruyter
Sep2022
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| Materias: | |
| Acceso en línea: | Ver este registro en EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=hlh&AN=158729342&site=ehost-live header: @attributes: shortDbName: hlh uiTerm: 158729342 longDbName: Humanities International Complete uiTag: AN controlInfo: bkinfo: jinfo: jid: 09320784 FL07 jtl: Zeitschrift für Naturforschung Section A: A Journal of Physical Sciences issn: 09320784 maglogo: N pubinfo: dt: Sep2022 vid: 77 iid: 9 pid: 1734 pub: De Gruyter artinfo: ui: 158729342 10.1515/zna-2021-0216 ppf: 899 ppct: 10 formats: tig: atl: Solid-state H and C NMR studies of novel ionic rotator-crystals of [NEtMeR][BEt] (R = Pr, Bu. x = 1, 2). aug: au: Nagai, Katsuumi Honda, Hisashi affil: Graduate School of Nanobioscience, Yokohama City University, Kanazawa-ku, Yokohama, 236-0027, Japan su: Plastic crystals Military communications Degrees of freedom Diffraction patterns Differential scanning calorimetry Nuclear magnetic resonance Superionic conductors sug: subj: Plastic crystals Military communications Degrees of freedom Diffraction patterns Differential scanning calorimetry Nuclear magnetic resonance Superionic conductors keyword: mesophase phase transition plastic crystal rotator crystal solid-state NMR ab: Four new ionic rotator-crystals of [NEtMeR][BEt] (R = Pr, Bu; x = 1, 2) were observed. Rotator crystals (two-dimensional plastic crystals) are mesophases between solid and isotropic liquid phases. Solid-state H and C nuclear magnetic resonance (NMR) measurements revealed that the ellipsoidal cations of [NEtMeR] undergo uniaxial rotation about their N–R axis and libration motion of the axis, and the anions perform isotropic reorientations in the highest-temperature solid-phase (rotator phase). Differential scanning calorimetry (DSC) measurements showed small entropy changes of 8–11 J K mol at the melting point of the compounds. These results suggest that the cations and anions have large degrees of freedom of motion in the rotator phase. The diffraction patterns of X-ray diffraction (XRD) could be indexed to the trigonal structure (space group of P31c). Compared with the reported data for [NEtMePr][BEtMe] (x = 1, 2) compounds, which also have rotator-crystal phases and transform to a plastic crystalline phase, a model that explains why the cations of [BEt] salts hardly perform isotropic reorientation in the solid phases was proposed. pubtype: Academic Journal doctype: Article src: R language: English refInfo: copyright: @attributes: flag: Y dt: @attributes: year: 2022 holdings: @attributes: islocal: N |
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