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Estimation of partial charges in small zeolite imidazolate frameworks from density functional theory calculations

Kumar Rana, Malay and Pazzona, Federico Giovanni and Suffritti, Giuseppe Baldovino and Demontis, Pierfranco and Masia, Marco (2011) Estimation of partial charges in small zeolite imidazolate frameworks from density functional theory calculations. Journal of Chemical Theory and Computation, Vol. 7 (6), p. 1575-1582. ISSN 1549-9618. eISSN 1549-9626. Article.

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DOI: 10.1021/ct100685p

Abstract

Zeolitic Imidazolate Frameworks (ZIFs) are the new frontier in the field of metalorganic materials. They incorporate the confining properties of the more traditional aluminosilicate zeolites together with the catalytic activity provided by transition metal ions and organic links. Computation of atomic point charges for these hybrid materials is important in the field of molecular simulations for substantial prediction of experimental results. However, due to the structural complexity of advanced materials in general, studies involving derivation of point charges for these materials are truly scarce. In this article, we have derived the atomic point charges of ZIF-8 through fitting of the quantum electrostatic potential obtained systematically from density functional theory (DFT) calculations both on finite clusters of increasing size and on the periodic system. For the periodic system, fluctuations on the atomic charges have been studied through ab initio molecular dynamics simulations. Using the latter approach, we have extended the study to ZIF-2 and ZIF-3, where it has been found that charge fluctuations are, as well as for ZIF8, very narrow, therefore justifying the use of the point charge approximation for these materials.

Item Type:Article
ID Code:6407
Status:Published
Refereed:Yes
Uncontrolled Keywords:Zeolite imidazolate frameworks (ZIFs)
Subjects:Area 03 - Scienze chimiche > CHIM/02 Chimica fisica
Divisions:002 Altri enti e centri di ricerca del Nord Sardegna > INSTM-Consorzio Interuniversitario Nazionale per la Scienza e la Tecnologia dei Materiali, Unità di ricerca di Sassari
001 Università di Sassari > 01 Dipartimenti > Chimica
Publisher:American Chemical Society
ISSN:1549-9618
eISSN:1549-9626
Copyright Holders:© 2011 American Chemical Society
Deposited On:25 Aug 2011 13:13

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