Catching the Reversible Formation and Reactivity of Surface Defective Sites in Metal-Organic Frameworks: An Operando Ambient Pressure-NEXAFS Investigation.

ABSTRACT: In this work, we apply for the first time ambient pressure operando soft X-ray absorption spectroscopy (XAS) to investigate the location, structural properties, and reactivity of the defective sites present in the prototypical metal-organic framework HKUST-1. We obtained direct evidence that Cu⁺ defective sites form upon temperature treatment of the powdered form of HKUST-1 at 160 °C and that they are largely distributed on the material surface. Further, a thorough structural characterization of the Cu⁺/Cu²⁺ dimeric complexes arising from the temperature-induced dehydration/decarboxylation of the pristine Cu²⁺/Cu²⁺ paddlewheel units is reported. In addition to characterizing the surface defects, we demonstrate that CO₂ may b

SUBMITTER: Braglia L 

PROVIDER: S-EPMC9282676 | biostudies-literature | 2021 Sep

REPOSITORIES: biostudies-literature