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The Pyridyl Functional Groups Guide the Formation of Pd Nanoparticles Inside A Porous Poly(4‐Vinyl‐Pyridine)
Author(s) -
Groppo Elena,
Agostini Giovanni,
Borfecchia Elisa,
Lazzarini Andrea,
Liu Wei,
Lamberti Carlo,
Giannici Francesco,
Portale Giuseppe,
Longo Alessandro
Publication year - 2015
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201500211
Subject(s) - palladium , reactivity (psychology) , small angle x ray scattering , xanes , chemistry , nanoparticle , acetic acid , polymer , vinyl acetate , fourier transform infrared spectroscopy , materials science , polymer chemistry , photochemistry , organic chemistry , spectroscopy , chemical engineering , copolymer , catalysis , scattering , nanotechnology , medicine , physics , pathology , quantum mechanics , alternative medicine , optics , engineering
The reactivity of palladium acetate inside a poly(4‐vinylpyridine‐co‐divinylbenzene) polymer is strongly influenced by the establishment of interaction between the Pd precursor and the pyridyl functional group in the polymer. Diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) and simultaneous X‐ray absorption near edge structure (XANES) and small angle X‐ray scattering (SAXS) techniques have been applied to monitor the reactivity of palladium acetate in the presence of H 2 and CO as a function of temperature. H 2 reduces palladium acetate to Pd nanoparticles and acetic acid. The pyridyl groups in the polymer play a vital role both in stabilizing the formed acetic acid, thus allowing its detection by means of DRIFTS, and the final Pd nanoparticles, which are extremely small and mono‐dispersed. On the contrary, CO does not reduce palladium acetate. Rather, it forms Pd 2+ carbonyl adducts, which favor the detachment of the acetate ligands and their thermal degradation. These adducts are well observable by means of SAXS because they cause an important local change of the electronic density.