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Melting of Naphthalene Confined in Mesoporous Silica MCM-41

Grünberg, B. and Grünberg, A. and Limbach, H. H. and Buntkowsky, G. (2013):
Melting of Naphthalene Confined in Mesoporous Silica MCM-41.
44, In: Applied Magnetic Resonance, (1-2), pp. 189-201, [Online-Edition: http://apps.webofknowledge.com/full_record.do?product=WOS&se...],
[Article]

Abstract

The H-2 nuclear magnetic resonance (NMR) solid-echo spectra of naphthalene molecules as guests in the mesopores of neat MCM-41 with a pore width of 3.3 nm were measured in the temperature regime from 180 to 250 K. A strong reduction of the melting point of the naphthalene molecules by 152 K is observed. The line shape changes in the melting region were simulated with two different models, namely, the model of a narrow distribution of activation energies, which is typical for a crystal-like phase, and a two-phase model. Both models indicate a relatively narrow distribution of melting points of the naphthalene molecules inside the pores, indicative of a rather well-defined structure of the naphthalene molecules inside the pores. This finding supports the proposal of a plastic crystalline phase previously proposed by other groups.

Item Type: Article
Erschienen: 2013
Creators: Grünberg, B. and Grünberg, A. and Limbach, H. H. and Buntkowsky, G.
Title: Melting of Naphthalene Confined in Mesoporous Silica MCM-41
Language: English
Abstract:

The H-2 nuclear magnetic resonance (NMR) solid-echo spectra of naphthalene molecules as guests in the mesopores of neat MCM-41 with a pore width of 3.3 nm were measured in the temperature regime from 180 to 250 K. A strong reduction of the melting point of the naphthalene molecules by 152 K is observed. The line shape changes in the melting region were simulated with two different models, namely, the model of a narrow distribution of activation energies, which is typical for a crystal-like phase, and a two-phase model. Both models indicate a relatively narrow distribution of melting points of the naphthalene molecules inside the pores, indicative of a rather well-defined structure of the naphthalene molecules inside the pores. This finding supports the proposal of a plastic crystalline phase previously proposed by other groups.

Journal or Publication Title: Applied Magnetic Resonance
Volume: 44
Number: 1-2
Uncontrolled Keywords: optical nuclear-polarization solid-state nmr magnetic-resonance potential applications molecular-dynamics glass formers mas nmr surface spectroscopy resolution
Divisions: 07 Department of Chemistry
07 Department of Chemistry > Physical Chemistry
Date Deposited: 27 Oct 2014 20:40
Official URL: http://apps.webofknowledge.com/full_record.do?product=WOS&se...
Additional Information:

074EU Times Cited:1 Cited References Count:68

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