Maiwald, Martin M. published the artcileThe complexation of neptunium(V) with fluoride at elevated temperatures: Speciation and thermodynamics, Category: pyrazoles-derivatives, the publication is Applied Geochemistry (2019), 10-18, database is CAplus.
The complexation of NpO+2 with fluoride is studied in aqueous solution using Vis/NIR absorption spectroscopy. The total ligand concentration (NaF), ionic strength (NaClO4), and temperature (T = 20-85°C) is varied, yielding detailed information on the thermodn. of the complexation reaction. Two distinct complex species (NpO2F1-nn, n = 1, 2) are identified by peak deconvolution of the absorption spectra. At 20°C and Im = 1.0 the absorption band of NpO2F is located at 983.8 ± 0.2 nm. The absorption band of the NpO2F–2 complex is located at 988.4 ± 0.2 nm. With increasing temperature and ionic strength the chem. equilibrium of the complexation reaction shifts towards the complexed Np(V) species. The conditional stability constants log β’n(T) are calculated according to the law of mass action and are extrapolated to Im = 0 for each temperature with the specific ion interaction theory (SIT). The determined log β0n(T) values increase by 0.2-0.6 in the studied temperature range. Furthermore, the log β0n(T) values correlate linearly with the reciprocal temperature and fitting the data according to the integrated Van’t Hoff equation yields the standard reaction enthalpies (ΔrH0m) and entropies (ΔrS0m).
Applied Geochemistry published new progress about 4551-69-3. 4551-69-3 belongs to pyrazoles-derivatives, auxiliary class Benzenes, name is 4-Benzoyl-5-methyl-2-phenyl-2,4-dihydro-3H-pyrazol-3-one, and the molecular formula is C17H14N2O2, Category: pyrazoles-derivatives.
Referemce:
https://en.wikipedia.org/wiki/Pyrazole,
Pyrazoles – an overview | ScienceDirect Topics