Disorder dynamics in solid 9‐hydroxyphenalenone
1991 (English)In: Journal of Chemical Physics, ISSN 0021-9606, E-ISSN 1089-7690, Vol. 95, 2696-2701 p.Article in journal (Refereed) Published
1 H nuclear magnetic resonance(NMR)spectra and spin‐lattice relaxation data as well as 1 H decoupled 13C spectra have been utilized to study the dynamics of the molecular disorder in solid 9‐hydroxyphenalenone. In the room‐temperature phase—stable between 255 and 380 K—the protonspectrum is narrowed compared to the spectrum of a static structure. This is consistent with a dynamically disordered structure where one of the two nonequivalent molecules reorients rapidly between its two possible equilibrium orientations. The proton spin‐lattice relaxation has a maximum of 7.2 s−1 in the same phase at about 355 K, in close agreement with a value of 7.6 s−1 calculated from the dynamical disorder model. The 1 H decoupled 13C powderspectrum in the room‐temperature phase is also consistent with this picture. Above the 385 K phase transition, the 13C powderspectrum is approaching axial symmetry, proving that all molecules reorient rapidly in that phase.
Place, publisher, year, edition, pages
1991. Vol. 95, 2696-2701 p.
Condensed Matter Physics
IdentifiersURN: urn:nbn:se:liu:diva-115207DOI: 10.1063/1.460921OAI: oai:DiVA.org:liu-115207DiVA: diva2:794218