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Dielectric Properties of Zeolitic Imidazolate Frameworks in the Broadband Infrared Regime

DOI: 10.1021/acs.jpclett.8b00799 DOI Help

Authors: Matthew R. Ryder (University of Oxford) , Zhixin Zeng (University of Oxford) , Kirill Titov (University of Oxford) , Yueting Sun (University of Oxford) , Ezwan M. Mahdi (University of Oxford) , Irina Flyagina (University of Oxford) , Thomas Bennett (University of Cambridge) , Bartolomeo Civalleri (University of Turin) , Chris S. Kelley (Diamond Light Source) , Mark D. Frogley (Diamond Light Source) , Gianfelice Cinque (Diamond Light Source) , Jin-chong Tan (University of Oxford)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: The Journal Of Physical Chemistry Letters

State: Published (Approved)
Published: May 2018
Diamond Proposal Number(s): 10215 , 14902

Abstract: The field of metal-organic framework (MOF) materials is rapidly advancing towards practical applications, consequently it is urgent to achieve a better understanding and precise control of their physical properties. Yet research on the dielectric properties of MOFs is at its infancy, where studies are confined to the static dielectric behavior or lower frequency response (kHz-MHz) only. Herein we present the pioneering use of synchrotron-based infrared reflectivity experiments, combined with density functional theory (DFT) calculations to accurately determine the dynamic dielectric properties of zeolitic imidazolate frameworks (ZIFs: a topical family of MOFs). We show, for the first time, the frequency-dependent dielectric response of representative ZIF compounds, bridging the near-, mid-, and far-infrared (terahertz THz) broadband frequencies. We establish the structure-property relations as a function of framework porosity and structural change. Our comprehensive results will be paving the way for novel ZIF-based terahertz applications, such as infrared optical sensors and high-speed wireless communications.

Subject Areas: Materials

Instruments: B22-Multimode InfraRed imaging And Microspectroscopy