Promotion of phosphoester hydrolysis by the Zr-IV-based metal-organic framework UiO-67

authors	Nunes, P; Gomes, AC; Pillinger, M; Goncalves, IS; Abrantes, M
nationality	International
journal	MICROPOROUS AND MESOPOROUS MATERIALS
author keywords	Metal-organic frameworks; Zirconium; UiO-67; Phosphoester; Hydrolysis
keywords	CHEMICAL WARFARE AGENTS; BIMETALLIC TETRABENZIMIDAZOLE COMPLEXES; ORGANOPHOSPHATE NERVE AGENTS; MODEL PHOSPHODIESTER; ESTER HYDROLYSIS; SULFUR MUSTARD; DEGRADATION; PHOSPHATE; STABILITY; PHOSPHOTRIESTERASE
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.
publisher	ELSEVIER SCIENCE BV
issn	1387-1811
year published	2015
volume	208
beginning page	21
ending page	29
digital object identifier (doi)	10.1016/j.micromeso.2015.01.016
web of science category	Chemistry, Applied; Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary
subject category	Chemistry; Science & Technology - Other Topics; Materials Science
unique article identifier	WOS:000352927000002