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Title: | Promotion of phosphoester hydrolysis by the Zr-IV-based metal-organic framework UiO-67 |
Author: | Nunes, Patrique Gomes, Ana C. Pillinger, Martyn Goncalves, Isabel S. Abrantes, Marta |
Keywords: | CHEMICAL WARFARE AGENTS BIMETALLIC TETRABENZIMIDAZOLE COMPLEXES ORGANOPHOSPHATE NERVE AGENTS MODEL PHOSPHODIESTER ESTER HYDROLYSIS SULFUR MUSTARD DEGRADATION PHOSPHATE STABILITY PHOSPHOTRIESTERASE |
Issue Date: | 2015 |
Publisher: | ELSEVIER SCIENCE BV |
Abstract: | The Zr-IV-based metal-organic framework (MOF) UiO-67 has been examined as a promoter of the hydrolysis of phosphoester bonds by using sodium para-nitrophenylphosphate (pNPP) as a model substrate. The reactions were followed by H-1 NMR spectroscopy and performed under mild conditions using 2-100 mol% of the MOF relative to pNPP. All of the systems studied promoted the hydrolysis of pNPP to give para-nitrophenol (pNPh) and inorganic phosphate. A reaction half-life of ca. 30 min was achieved using 17 mol% of UiO-67 at 55 degrees C and 30 mol% at ambient temperature; >= 98% removal of pNPP was reached within 1 h for both reaction temperatures. H-1 NMR spectra of the reaction solutions, together with powder X-ray diffraction, FT-IR spectroscopy and solid-state NMR data for the recovered MOF, revealed that (i) pNPP was encapsulated and then converted to pNPh within the cavities of UiO-67, (ii) both pNPh and inorganic phosphate were retained in the solid promoter, and (iii) the MOF suffered partial structural breakdown into the components Zr6O4(OH)(4) and 4,4'-biphenyldicarboxylate, with partial release of the latter into solution. These structural changes eventually compromized the recyclability of the promoter, although the material could be recovered and reused in a second cycle without loss of activity. (C) 2015 Elsevier Inc. All rights reserved. |
Peer review: | yes |
URI: | http://hdl.handle.net/10773/19283 |
DOI: | 10.1016/j.micromeso.2015.01.016 |
ISSN: | 1387-1811 |
Publisher Version: | 10.1016/j.micromeso.2015.01.016 |
Appears in Collections: | CICECO - Artigos |
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