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Gradual Release of Strongly-Bound Nitric Oxide from Fe2(NO)2(dobdc)



Eric D. Bloch, Wendy L. Queen, Sachin Chavan, Paul S. Wheatley, Joseph M. Zadrozny, Russell E. Morris, Craig Brown, Carlo Lamberti, Silvia Bordiga, Jeffrey R. Long


An iron-based metal-organic framework featuring coordinatively-unsaturated redox-active metal cation sites, Fe2(dobdc) (dobdc4- = 1,4-dioxido-2,5-benzenedicarboxylate), is shown to strongly bond nitric oxide at 298 K. Adsorption isotherms indicate an adsorption capacity greater than 16 mass %, corresponding to the adsorption of one NO molecule per iron center. Infrared, UV-vis, and Mossbauer spectroscopies, together with magnetic susceptibility data, confirm the strong binding is a result of electron transfer from the FeII site to form FeIII-NO-adducts. Consistent with these results of, powder neutron diffraction experiments indicate that NO is bound to the iron centers of the framework with an Fe-NO separation of 1.77 (1) A and an Fe-N-O angle of 150.9 (5)°. The nitric oxide-containing material, Fe2(NO)2(dobdc), steadily releases bound NO under humid conditions over the course of more than 10 days, making it a much better candidate than other porous materials for certain biomedical applications.
Journal of the American Chemical Society


neutron diffraction, metal-organic framework, gas adsorption


Bloch, E. , Queen, W. , Chavan, S. , Wheatley, P. , Zadrozny, J. , Morris, R. , Brown, C. , Lamberti, C. , Bordiga, S. and Long, J. (2015), Gradual Release of Strongly-Bound Nitric Oxide from Fe<sub>2</sub>(NO)<sub>2</sub>(dobdc), Journal of the American Chemical Society, [online], (Accessed July 24, 2024)


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Created February 23, 2015, Updated October 12, 2021