Chromium-free conversion coatings were deposited from a bath containing potassium hexafluorotitanate(IV). The substrate was electrogalvanized carbon steel. The obtained coatings had a microspheroidal structure and were homogenous. An XPS analysis showed that the coatings were composed of: oxides...

Reaction between N2H6F2 and Sn(OH)4 in aqueous HF as solvent gave two new complexes, N2H6SnF6 and (N2H6)2SnF6.F2, depending on the initial molar ratio of the starting materials. In a laser beam N2H6SnF6 is slowly destroyed and the product of decomposition as a mixture of the N2H5+ and NH4+ compo...

Ferrierite zeolite has been treated with ammonium hexafluorosilicate (AHFS). The prepared catalysts were characterized by XRD, atomic absorption spectroscopy, ammonia TPD, FT-IR, SEM, BET/pore size distribution and pyridine chemisorption. Their catalytic activity has been evaluated in the skelet...

Zeolite Y has been dealuminated with ammonium hexafluorosilicate. The influence of the reaction conditions — concentration of reactants, number of treatments, and time and temperature of reaction on the final properties of the products has been studied. The materials thus obtained have been cha...

Different samples were prepared by treating a NH4MOR sample (Si/Al = 5) with ammonium hexafluorosilicate. The dealumination of the outer surface of mordenite crystallites was more pronounced than that of the bulk. A decrease in the adsorption rate and capacity for organic molecules and in activi...

The number of washes with boiling water of a Y zeolite dealuminated with ammonium hexafluorosilicate strongly affects its stability under hydrothermal conditions. Traces of hexafluorosilicate, difficult to eliminate completely through washing, would be responsible for this effect. Hydrothermal t...

The preparation and characterization of the ammonium hexafluorosilicate salts, 2[R]+ [SiF6]2− (where R=piperidinium (2), methylammonium (3), quinolinium (4), acridinium (5), 2,2,6,6-tetramethylpiperidinium (6), and propylammonium (7)) is described.The salts were prepared from the reaction of the...

A series of silicon incorporated TiO2 with anatase crystalline phase were prepared via sol–gel using ammonium hexafluorosilicate (AHFS). The synthesized products were characterized using X-ray diffraction, FTIR, X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), UV–vis...

An integration of different modelling methods including object and mathematical simulation are suggested for sublimation processes of inorganic fluorides to optimally simulate the real technological conditions. The paper presents the results of testing this methodology on ammonium hexafluorosili...

In this work, hydrolysis of three different hexafluorophosphate salts in purified water was investigated. Aqueous samples of lithium hexafluorophosphate (LiPF6), sodium hexafluorophosphate (NaPF6) and potassium hexafluorophosphate (KPF6) were prepared and stored for different times. Ion chromato...

The water sorption behavior of representative pyridinium-based ionic liquid (IL), 1-hexylpyridinium hexafluorophosphate ([C6Py][PF6]), was studied over the whole range of the water activity a using a continuous gravimetric method. The analysis of the water sorption isotherm using the combination...

Co-crystal of 1,10-phenanthrolin-1-ium-caffeine-hexafluorophosphate was synthesized, studied by FTIR, 1H, 13C NMR, DSC and X-ray structure and crystallized in the monoclinic space group C2/c. The unit cell parameters are a = 19.3761 (3), b = 17.9548 (3), c = 13.8074 (3) with β = 117.8132 (10). ...

The electrochemical intercalation of hexafluorophosphate anion into a graphite electrode has been studied in mixed solvents of ethylene carbonate (EC) and ethylmethyl carbonate (EMC). The suppression effect of EC and the favourable effect of EMC on hexafluorophosphate insertion into graphite in ...

Thermal decomposition and vibrational spectroscopic properties of pyridinium hexafluorophosphate (C5H5NHPF6) have been studied. The structure of the compound is better interpreted as having a cubic space group, based on Raman and infrared vibrational spectroscopy experiments and group theoretica...

In this work, we measured the vapor-liquid equilibrium of 2,3,3,3-tetrafluoroprop-1-ene (R1234yf) in three ionic liquids, including 1-butyl-3-methylimidazolium hexafluorophosphate ([Bmim][PF6]), 1-hexyl-3-methylimidazolium hexafluorophosphate ([Hmim][PF6]), and 1-octyl-3-methylimidazolium hexafl...

Tranexamic acid (TA) possess antifibrinolytic properties and finds extensive applications in pharmaceuticals. Its oxidation-kinetic study is of much significance in understanding the mechanistic profile of TA in biological systems. In this context, a systematic kinetic study of palladium(II) (Pd...

The formation and further reactions of halamines during oxidative water treatment can be relevant for water quality. In this study, we investigated the formation and reactivity of several inorganic and organic halamines (monochloramine, N-chloromethylamine, N-chlorodimethylamine, monobromamine, ...

Following the ban of four nitrofurans in the mid-90s (furazolidone, furaltadone, nitrofurantoine, nitrofurazone), the nifursol, a veterinary drug from the nitrofuran class of antibacterials which has been used prophylactically as feed additive for treating turkeys against histomoniasis (blackhea...

Nifursol has recently been prohibited for use as a feed additive. Considering the similarity in structure between nifursol and the other nitrofurans, an analogous metabolism could be expected. To study the formation of tissue-bound residues in poultry, broilers were treated orally with nifursol ...

Palladium catalysed Heck couplings have been applied to the two-step synthesis of a stilbene derivative bearing a diphenylphosphine oxide function which represents a suitable precursor for the photochemical generation of the corresponding [7]-helicene. After reduction of the phosphine oxide, res...