Defining the Proton Topology of the Zr6-Based Metal鈥揙rganic Framework NU-1000

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• 作者：Nora Planas ; Joseph E. Mondloch ; Samat Tussupbayev ; Joshua Borycz ; Laura Gagliardi ; Joseph T. Hupp ; Omar K. Farha ; Christopher J. Cramer
• 刊名：The Journal of Physical Chemistry Letters
• 出版年：2014
• 出版时间：November 6, 2014
• 年：2014
• 卷：5
• 期：21
• 页码：3716-3723
• 全文大小：396K
• ISSN：1948-7185

文摘

Metal鈥搊rganic frameworks (MOFs) constructed from Zr₆-based nodes have recently received considerable attention given their exceptional thermal, chemical, and mechanical stability. Because of this, the structural diversity of Zr₆-based MOFs has expanded considerably and in turn given rise to difficulty in their precise characterization. In particular it has been difficult to assign where protons (needed for charge balance) reside on some Zr₆-based nodes. Elucidating the precise proton topologies in Zr₆-based MOFs will have wide ranging implications in defining their chemical reactivity, acid/base characteristics, conductivity, and chemical catalysis. Here we have used a combined quantum mechanical and experimental approach to elucidate the precise proton topology of the Zr₆-based framework NU-1000. Our data indicate that a mixed node topology, [Zr₆(渭₃鈥揙)₄(渭₃鈥揙H)₄(OH)₄ (OH₂)₄]⁸⁺, is preferred and simultaneously rule out five alternative node topologies.

Keywords:

node topology; density functional theory; IR spectroscopy; tautomerism