Synthesis and thermal decomposition study of dysprosium trifluoroacetate

Abstract

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Silica supported lanthanum trifluoroacetate and trichloroacetate as an efficient and reusable water compatible Lewis acid catalyst for synthesis of 2,4,5-triarylimidazoles via a solvent-free green approach

“…Unsupported lanthanum trifluoroacetate and trichloroacetate show characteristics diffraction peaks mainly includes 2 θ value = 10°, 16°, 23°, 33°, 38°, 47°, 55°. 32,33…”

“…While third curve (from temperature range 259 °C to 310 °C) with maximum mass loss of 65 and 70% respectively, was associated due to a complete loss of trifluoroacetate and trichloroacetate group of the anhydrous Lewis acid with the formation of LaF 3 and LaCl 3 decomposition product. 32,33…”

Reactivity of bi- and monometallic trifluoroacetates towards amorphous SiO2

“…4,42,43 The second pathway involves etching of a-SiO 2 by gaseous hydrogen fluoride (eqn (2)). 44,45 HF may be formed upon hydrolysis of trifluoroacetic anhydride.a-SiO 2 + 2CF 2 → SiF 4 + 2COa-SiO 2 + 4HF → SiF 4 + 2H 2 O(CF 3 CO) 2 O has been identified as a byproduct of trifluoroacetate thermolysis 4,43,46–48 and the presence of residual water cannot be ruled out under our experimental conditions. Both fluorination pathways may be operating if water is present since hydrolysis of (CF 3 CO) 2 O leads to the formation of trifluoroacetic acid which in turns produces difluorocarbene.…”

“…(CF 3 CO) 2 O has been identified as a byproduct of trifluoroacetate thermolysis 4,43,[46][47][48] and the presence of residual water cannot be ruled out under our experimental conditions. Both fluorination pathways may be operating if water is present since hydrolysis of (CF 3 CO) 2 O leads to the formation of trifluoroacetic acid which in turns produces difluorocarbene.…”

Structural Evolution of Iron(III) Trifluoroacetate upon Thermal Decomposition: Chains, Layers, and Rings

“…Despite such broad practical deployment of TFAs as precursors, the mechanism of their decomposition remains surprisingly unexplored. The decomposition is typically monitored by thermal analysis in the course of the reaction [i.e., differential thermal analysis or thermogravimetric analysis (TGA)], by analysis of mass spectra of the volatile fragments, by Fourier transform infrared (FTIR) spectroscopy and/or powder X-ray diffraction (XRD). ,− However, structural evolution with complex intermediates during the heating process had not been reported. Obtaining atomistic insights into the solid-state intermediates is limited as sufficiently large single crystals necessary for determining the structure are absent.…”