Chemiluminescence (CL) was found in the solid-phase interaction of xenon difluoride with uranyl hydrogen phosphate; the CL emitters are *Xe, UO22+ and the singlet oxygen dimole (1O2)2.
Vanadium pentafluoride reacts via an oxygen exchange reaction with phosphorous oxytrifluoride to give VOF3 and PF5. The latter forms a weak 1:1 adduct. VF5 reacts with trifluoroacetic acid to form trifluoroacetyl fluoride and VOF3. Both reactions are indicative of the strength of the VO bond a...
The formation of tetrasubstituted benzenes and doubly lithiated intermediates in metalation/formylation reactions of 3-methoxymethoxyanisole has been observed with the methoxymethoxy group acting as a leaving group in some cases.
Vibrational study of pH dependent molecular structures of (hydroxypyridin-4-yl-methyl)phosphonic acid is discussed based on experimental data and quantum-chemical calculations. A cationic, a zwitteranionic as well as mono- and dianionic forms of the acid are considered in our work. Equilibrium g...
As a previous step in their application as emulsifiers, here we performed a study of the hydrophile–lipophile balance (HLB) properties of decyl (C10H21PO3H2), dodecyl (C12H25PO3H2), tridecyl (C13H27PO3H2) phosphonic acids and their mono and disodic salts. Two different methods (Griffin and Gree...
Hydrolysis of difluoromethylene phosphonate esters quantitatively yields difluoromethylene bis phosphonic acid as a dihydrate. In vacuo drying leads to either the monohydrate or the anhydrous acid. Titration of either the free acid or its disodium salt and computer fit of the data gives all four...
The radical polymerization of disodium salt of 2-methyl-1,3-butadiene-1-phosphonic acid (isoprenephosphonic acid) in aqueous solutions has been investigated over a wide range of pH values. Relations of a bimodal type have been found between the pH of the medium and the polymerization rate and in...
The synthesis, structure and application of highly functionalized organometallic phosphonic acids are reviewed. Phosphonic acid derivatives of phosphorus(III) and transition metals are emphasized. Coordination chemistry, homogeneous catalytic reactions and synthesis of new materials are also rev...
Porphyrazines with phosphonic acid groups on the peripheral positions have been prepared by the cyclotetramerization of 1,2-bis{2-(diethyl phosphonate)ethylthio} maleonitrile and followed by the cleavage of the phosphonate esters with TMSBr.
Orange G (OG) is an important chemical for the textile industry but also a major water contaminant. It is also a model compound representing more toxic azo dyes and degradation products. Activation of persulphate (PS) by zerovalent iron nanoparticles (nZVI) has been proposed as an effective tech...
Barium was deposited at room temperature on a thermal silicon oxide layer and the interfacial reaction was monitored by synchrotron induced photoemission (both core level and valence band). The first step of the growth consists of an interfacial reaction which leads to the formation of an interf...
Barium silicates (BaSiO3, BaSi2O5) have been synthesized by using the glow discharge electron gun. The melting installation, the sample preparation procedures as well as the experiment results of synthesis together with the crystallographic analysis for the raw materials and the obtained barium ...
Over 2500 articles and 200 reviews have been published on the bioactive tri/dicalcium silicate dental materials. The indications have expanded since their introduction in the 1990s from endodontic restorative and pulpal treatments to endodontic sealing and obturation. Bioactive ceramics, based o...
While the isotopic variations of barium were reported for the first time fourty years ago, the number of studies on barium isotopes significantly increased only after 2010. Barium isotope anomalies in meteorites have been successfully used to provide constraints about the origin of presolar SiC ...
ObjectiveThe objectives of this study were the investigation of the setting mechanisms and characterization of radiopacified tricalcium silicate–based materials mixed with different liquid vehicles.
Statement of problemThe improved esthetics of ceramic dental prostheses has increased their popularity, although their high elastic modulus and low fracture toughness and tensile strength may reduce the long-term performance of dental prostheses.
The aim of this research is to show the effect of zirconium silicate addition on sintering and physicochemical properties of glass-ceramic materials from the SiO2–Al2O3–Na2O–K2O–CaO–MgO–BaO system. This paper presents the results of the most important techniques used to understand the sint...
This work is intended to report pertinent studies covering several aspects viz., spectroscopic, higher order non-linear optical studies and positron annihilation spectroscopic studies on lead zirconium silicate glass ceramics admixed with different contents of MnO. Lead zirconium silicate glasse...
This paper reviews the particular crystal-chemical properties of fluorides containing tetravalent terbium and emphasises the special case of the half-filled shell 4f7 of the Tb4+ ion. To this end the crystal-chemical properties of Zr4+, Tb4+ and U4+ are compared. The way according to which the t...
A numerical model was developed to study the time dynamics of photoluminescence emitted by Tb3+ doped multimode chalcogenide-selenide glass fibers pumped by laser light at approximately 2 μm. The model consists of a set of partial differential equations (PDEs), which describe the temporal and s...
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