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Adamantane as a probe for studies of spin clustering with multiple quantum NMR

Buntkowsky, G. ; Roessler, E. ; Taupitz, M. ; Vieth, H. M. (1997)
Adamantane as a probe for studies of spin clustering with multiple quantum NMR.
In: Journal of Physical Chemistry A, 101 (1)
Artikel, Bibliographie

Kurzbeschreibung (Abstract)

Time domain H-1 multiple quantum NMR (MQ NMR) was applied to study binary guest/host systems. We investigated protonated adamantane-h(16) (A-h(16)) molecules in deuterated crystalline adamantane-d(16) (A-d(16)) and in glassy polystyrene-d(8) (PS) for various guest concentrations and coupling times tau/tau(c). For pure A-h(16) crystals spin clusters of more than 1000 connected spins were observed. We observed the evolution of the multiple quantum connectivities as a function of the coupling time. In all cases the growth curves of the; multiple quantum orders can be described by a master curve, showing the validity of a scaling law. For the diluted systems the master curve is obtained by multiplying the time axis with the square root of the dipolar line width (Delta nu)(1/2). The different local structure of the systems leads to characteristic growth curves, in particular to a quadratic function for the crystalline and to a linear function for the glassy material. For short coupling times these differences can be attributed to geometrical constraints caused by the polymer chains while for longer coupling times geometrical constraints and dynamics of the polymer chains can both be responsible for the different growth curves. The technique was applied to study slow phase separation processes in a solution of A-h(16) in PS.

Typ des Eintrags: Artikel
Erschienen: 1997
Autor(en): Buntkowsky, G. ; Roessler, E. ; Taupitz, M. ; Vieth, H. M.
Art des Eintrags: Bibliographie
Titel: Adamantane as a probe for studies of spin clustering with multiple quantum NMR
Sprache: Deutsch
Publikationsjahr: 1997
Titel der Zeitschrift, Zeitung oder Schriftenreihe: Journal of Physical Chemistry A
Jahrgang/Volume einer Zeitschrift: 101
(Heft-)Nummer: 1
URL / URN: http://apps.webofknowledge.com/full_record.do?product=WOS&se...
Kurzbeschreibung (Abstract):

Time domain H-1 multiple quantum NMR (MQ NMR) was applied to study binary guest/host systems. We investigated protonated adamantane-h(16) (A-h(16)) molecules in deuterated crystalline adamantane-d(16) (A-d(16)) and in glassy polystyrene-d(8) (PS) for various guest concentrations and coupling times tau/tau(c). For pure A-h(16) crystals spin clusters of more than 1000 connected spins were observed. We observed the evolution of the multiple quantum connectivities as a function of the coupling time. In all cases the growth curves of the; multiple quantum orders can be described by a master curve, showing the validity of a scaling law. For the diluted systems the master curve is obtained by multiplying the time axis with the square root of the dipolar line width (Delta nu)(1/2). The different local structure of the systems leads to characteristic growth curves, in particular to a quadratic function for the crystalline and to a linear function for the glassy material. For short coupling times these differences can be attributed to geometrical constraints caused by the polymer chains while for longer coupling times geometrical constraints and dynamics of the polymer chains can both be responsible for the different growth curves. The technique was applied to study slow phase separation processes in a solution of A-h(16) in PS.

Freie Schlagworte: nuclear-magnetic-resonance solid-state nmr dynamics decomposition spectroscopy relaxation scattering excitation simulation c10h16
Zusätzliche Informationen:

Wl080 Times Cited:13 Cited References Count:34

Fachbereich(e)/-gebiet(e): 07 Fachbereich Chemie
07 Fachbereich Chemie > Eduard Zintl-Institut > Fachgebiet Physikalische Chemie
Hinterlegungsdatum: 27 Okt 2014 20:38
Letzte Änderung: 28 Mai 2019 10:29
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