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Nitro functionalized chromium terephthalate metal-organic framework as multifunctional solid acid for the synthesis of benzimidazoles.

Authors
  • Vallés-García, Cristina1
  • Cabrero-Antonino, María1
  • Navalón, Sergio2
  • Álvaro, Mercedes1
  • Dhakshinamoorthy, Amarajothi3
  • García, Hermenegildo4
  • 1 Departamento de Química, Universitat Politècnica de València, C/Camino de Vera, s/n, 46022 Valencia, Spain. , (Spain)
  • 2 Departamento de Química, Universitat Politècnica de València, C/Camino de Vera, s/n, 46022 Valencia, Spain. Electronic address: [email protected] , (Spain)
  • 3 School of Chemistry, Madurai Kamaraj University, Madurai 625 021, Tamil Nadu, India. Electronic address: [email protected] , (India)
  • 4 Departamento de Química and Instituto Universitario de Tecnologia Química (CSIC-UPV), Av. De los Naranjos s/n, 46022 Valencia, Spain; Center of Excellence for Advanced Materials Research, King Abdulaziz University, Jeddah, Saudi Arabia. Electronic address: [email protected] , (Spain)
Type
Published Article
Journal
Journal of Colloid and Interface Science
Publisher
Elsevier
Publication Date
Feb 15, 2020
Volume
560
Pages
885–893
Identifiers
DOI: 10.1016/j.jcis.2019.10.093
PMID: 31718791
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

In the present work, nitro functionalized chromium terephthalate [MIL-101(Cr)-NO2] metal- organic framework is prepared and characterized by powder X-ray diffraction (XRD), elemental analysis, infrared spectroscopy (IR), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM) and Brunauer-Emmett-Teller (BET) surface area. The inherent Lewis acidity of MIL-101(Cr)-NO2 is confirmed by FT-IR spectroscopy using CD3CN as a probe molecule. The performance of MIL-101(Cr)-NO2 as bifunctional catalyst (acid and redox) promoting the synthesis of wide range of benzimidazoles has been examined by catalyzed condensation on acid sites and subsequent oxidative dehydrogenation. The catalytic activity of MIL-101(Cr)-NO2 is found to be superior than analogues catalysts like MIL-101(Cr)-SO3H, MIL-101(Cr)-NH2, UiO-66(Zr), UiO-66(Zr)-NO2, MIL-100(Fe) and Cu3(BTC)2 (BTC: 1,3,5-benzenetricarboxylate) under identical reaction conditions. The structural stability of MIL-101(Cr)-NO2 is supported by leaching analysis and reusability tests. MIL-101(Cr)-NO2 solid is used five times without decay in its activity. Comparison of the fresh and five times used MIL-101(Cr)-NO2 solids by powder XRD, SEM and elemental analysis indicate identical crystallinity, morphology and the absence of chromium leaching, respectively. Copyright © 2019 Elsevier Inc. All rights reserved.

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