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Characterization of isomers in aluminum tris(quinoline-8-olate) by one-dimensional [sup 27]Al nuclear magnetic resonance under magic-angle spinning

Characterization of isomers in aluminum tris(quinoline-8-olate) by one-dimensional [sup 27]Al nuclear magnetic resonance under magic-angle spinning
Characterization of isomers in aluminum tris(quinoline-8-olate) by one-dimensional [sup 27]Al nuclear magnetic resonance under magic-angle spinning
Solid-state 27Al NMR spectra under magic-angle spinning of different forms of aluminum tris(quinoline-8-olate) (Alq3) are presented. Alq3 is an organometallic complex of great importance in the context of organic light-emitting diodes. Our results demonstrate a strong difference in the asymmetry of the electric field gradient (EFG) tensor at the aluminum site between the ? and the recently discovered ? polymorph of Alq3. While the EFG is nearly planar (??1) in the ? phase, it is nearly axially symmetric (??0) for the ? phase. This result provides strong support to the hypothesis that the ? phase contains the facial isomer of Alq3. While the spectra of both the ? and the ? polymorphs exhibit sharp features, highly disordered forms of Alq3 obtained from rapid vapor deposition onto a cold substrate, yield broadened spectra, indicating substantial structural disorder in the local geometry of different Alq3 molecules.
0003-6951
4023
Utz, Marcel
c84ed64c-9e89-4051-af39-d401e423891b
Nandagopal, Magesh
a08fa4a0-1288-413d-95a2-82eca7d1d8f8
Mathai, Mathew
a6b69d14-32f4-4e10-af5c-3c377d485843
Papadimitrakopoulos, Fotios
8de3549f-a482-441a-bb31-d1f5269d873c
Utz, Marcel
c84ed64c-9e89-4051-af39-d401e423891b
Nandagopal, Magesh
a08fa4a0-1288-413d-95a2-82eca7d1d8f8
Mathai, Mathew
a6b69d14-32f4-4e10-af5c-3c377d485843
Papadimitrakopoulos, Fotios
8de3549f-a482-441a-bb31-d1f5269d873c

Utz, Marcel, Nandagopal, Magesh, Mathai, Mathew and Papadimitrakopoulos, Fotios (2003) Characterization of isomers in aluminum tris(quinoline-8-olate) by one-dimensional [sup 27]Al nuclear magnetic resonance under magic-angle spinning. Applied Physics Letters, 83 (19), 4023. (doi:10.1063/1.1623945).

Record type: Article

Abstract

Solid-state 27Al NMR spectra under magic-angle spinning of different forms of aluminum tris(quinoline-8-olate) (Alq3) are presented. Alq3 is an organometallic complex of great importance in the context of organic light-emitting diodes. Our results demonstrate a strong difference in the asymmetry of the electric field gradient (EFG) tensor at the aluminum site between the ? and the recently discovered ? polymorph of Alq3. While the EFG is nearly planar (??1) in the ? phase, it is nearly axially symmetric (??0) for the ? phase. This result provides strong support to the hypothesis that the ? phase contains the facial isomer of Alq3. While the spectra of both the ? and the ? polymorphs exhibit sharp features, highly disordered forms of Alq3 obtained from rapid vapor deposition onto a cold substrate, yield broadened spectra, indicating substantial structural disorder in the local geometry of different Alq3 molecules.

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More information

Published date: 3 November 2003
Organisations: Chemistry, Faculty of Natural and Environmental Sciences, Magnetic Resonance

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Local EPrints ID: 355571
URI: https://eprints.soton.ac.uk/id/eprint/355571
ISSN: 0003-6951
PURE UUID: 76b22542-3476-4404-b5d1-45f6b8310771
ORCID for Marcel Utz: ORCID iD orcid.org/0000-0003-2274-9672

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Date deposited: 18 Nov 2013 14:20
Last modified: 14 Jul 2018 00:30

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Author: Marcel Utz ORCID iD
Author: Magesh Nandagopal
Author: Mathew Mathai
Author: Fotios Papadimitrakopoulos

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