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Flexibility control in alkyl ether-functionalized pillared-layered MOFs by a Cu/Zn mixed metal approach

DOI: 10.1039/C9DT01105F DOI Help

Authors: Andreas Schneemann (Technische Universität München; Ruhr Universität Bochum) , Robin Rudolf (Georgia Institute of Technology) , Samuel J. Baxter (Georgia Institute of Technology) , Pia Vervoorts (Technische Universität München) , Inke Hante (Technische Universität München) , Kira Khaletskaya (Technische Universität München) , Sebastian Henke (Technische Universität Dortmund) , Gregor Kieslich (Ruhr Universität Bochum) , Roland A. Fischer (Ruhr Universität Bochum)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Dalton Transactions

State: Published (Approved)
Published: April 2019
Diamond Proposal Number(s): 13560

Abstract: Flexible metal-organic frameworks (MOFs) exhibit large potential as next-generation materials in areas such as gas sensing, gas separation and mechanical damping. By using a mixed metal approach, we report how the stimuli reponsive phase transition of flexible pillared-layered MOFs can be tuned over a wide range. Different Cu2+ to Zn2+ metal ratios are incorporated into the materials by using a simple solvothermal approach. The properties of the obtained materials are probed by differential scanning calorimetry and CO2 sorption measurements, revealing stimuli responsive behaviour as a function of metal ratio. Pair distribution functions derived from X-ray total scattering experiments suggest a distortion of the M2 paddlewheel as a function of the Cu content. We rationalize these phenomena by the different distortion energies of Cu2+ and Zn2+ ions to deviate from the square pyramidal structure of the relaxed paddlewheel node.Our work follows on from the large interest in tuning and understanding the materials properties of flexible MOFs, highlighting the large number of parameters that can be used for the targeted manipulation and design of properties of these fascinating materials.

Subject Areas: Chemistry, Materials


Beamlines: I15-Extreme Conditions