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Issue 20, 2006
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High field ENDOR as a characterization tool for functional sites in microporous materials

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Abstract

The determination of the details of the spatial and electronic structure of functional sites (centers) in any system, be it in materials chemistry or in biology, is the first step towards understanding their function. When such sites happen to be paramagnetic in any point of their activity cycle, the tool box offered by a variety of high resolution electron paramagnetic resonance (EPR) spectroscopic techniques becomes very attractive for their characterization. This tool box has been considerably expanded by the developments in high field (HF) EPR in general, and HF electron nuclear double resonance (ENDOR), in particular. These have led to numerous new applications in the fields of biology, physics, chemistry and materials sciences. This overview focuses specifically on recent applications of pulsed HF ENDOR spectroscopy to microporous materials, such as zeotype materials, presenting the new opportunities it offers. First, a brief description of the theoretical basis required for the analysis of the HF ENDOR spectrum is given, followed by a description of the pulsed techniques used to record spectra and assign the signals, along with a brief presentation of the required instrumentation. Next, specific applications are given, including transition metal ions and complexes exchanged into zeolite cages, transition metal substitution into frameworks of zeolites, aluminophosphate molecular sieves, and silicious mesoporous materials, the interaction of NO with Lewis sites in zeolite cages and trapped Sāˆ’3. We end with a discussion of the advantages and the shortcomings of the method and conclude with a future outlook.

Graphical abstract: High field ENDOR as a characterization tool for functional sites in microporous materials

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Publication details

The article was received on 31 Jan 2006, accepted on 14 Mar 2006 and first published on 07 Apr 2006


Article type: Invited Article
DOI: 10.1039/B601513C
Citation: Phys. Chem. Chem. Phys., 2006,8, 2325-2343

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    High field ENDOR as a characterization tool for functional sites in microporous materials

    D. Goldfarb, Phys. Chem. Chem. Phys., 2006, 8, 2325
    DOI: 10.1039/B601513C

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