Porous, rigid metal(III)-carboxylate metal-organic frameworks for the delivery of nitric oxide

Porous, rigid metal(III)-carboxylate metal-organic frameworks for the delivery of nitric oxide

Porous, rigid metal(III)-carboxylate metal-organic frameworks for the delivery of nitric oxide 

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Jarrod F. Eubank^1,a), Paul S. Wheatley², Gaëlle Lebars³, Alistair C. McKinlay², Hervé Leclerc³, Patricia Horcajada¹, Marco Daturi³, Alexandre Vimont³, Russell E. Morris² and Christian Serre¹
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a) Present address: Department of Chemistry and Physics, Florida Southern College, Lakeland, FL 33801, USA.
APL Mat. 2, 124112 (2014); http://dx.doi.org/10.1063/1.4904069

ABSTRACT

The room temperature sorption properties of the biological gas nitric oxide (NO) have been investigated on the highly porous and rigid iron or chromium carboxylate based metal-organic frameworks Material Institut Lavoisier (MIL)-100(Fe or Cr) and MIL-127(Fe). In all cases, a significant amount of NO is chemisorbed at 298 K with a loading capacity that depends both on the nature of the metal cation, the structure and the presence of additional iron(II) Lewis acidsites. In a second step, the release of NO triggered by wet nitrogen gas has been studied bychemiluminescence and indicates that only a partial release of NO occurs as well as a prolonged delivery at the biological level. Finally, an in situ infrared spectroscopy study confirms not only the coordination of NO over the Lewis acid sites and the stronger binding of NO on the additional iron(II) sites, providing further insights over the partial release of NO only in the presence of water at room temperature.