The first compound of xenon was synthesised more than half a century ago. The realisation that the noble gases form chemical compounds also led to the synthesis of a first krypton compound within less than a year. Despite their common beginnings, the chemistries of xenon and krypton have never intertwined to form a single compound containing both chemically bound noble gases. Recently, the paper "Mixed Noble-Gas Compounds of Krypton(II) and Xenon(VI); [F5Xe(FKrF)AsF6] and [F5Xe(FKrF)2AsF6]" was published in the journal Angewandte Chemie, in which Asst. Prof. Matic Lozinšek from the Department of Inorganic Chemistry and Technology and colleagues from McMaster University in Canada report on the synthesis, structural and quantum-chemical characterisation of the first compounds containing chemically bound two noble gases, xenon and krypton. In these complexes, which are very strong oxidants and were synthesised at low temperatures, krypton difluoride is coordinated to pentafluoridoxenon(1+) cation via a fluoride bridge. In addition, two novel coordination compounds are reported in which the hydrogen fluoride molecule is bonded to the xenon cation. The described compounds open new avenues in synthetic and coordination chemistry of noble gases. The paper received the editorial designation "Hot Paper".
COBISS.SI-ID: 39698179
Photochemical reactions between solid, liquid or gaseous fluorides and pure F2 or O2/F2 mixtures in anhydrous HF and in the presence of UV light have been shown to be very successful in the synthesis of [O2]+ salts. In some cases, the corresponding oxides can also be used as starting compounds. With this approach, a whole range of compounds was prepared, i.e., such as already known[O2][BF4], [O2][MF6] (M = As, Sb, Au; Pt), [O2][GeF5] and [O2]2[Ti7F30] salts and hitherto unknown [O2][GeF5].HF, ?-[O2][Sn2F9] (1-D) and the HF-solvated and unsolvated form of ß-[O2][Sn2F9] (2-D)
COBISS.SI-ID: 33138471
By a direct synthesis method, oxidative dissolution of manganese powder in the presence of Schiff bases ammonium salt and oxygen in air, we have prepared a family of eight polymeric manganese complexes (III). According to the results of X-ray structural analysis, the main structural feature of the compounds is the one-dimensional polymer structure. In most cases, the cationic chains and anions are connected by electrostatic interactions and hydrogen bonds. However, in one case, the polymers are composed of neutral units. The compounds were also characterized by electronic paramagnetic resonance. The study was also complemented by ab-initio CASSCF and DFT calculations.
COBISS.SI-ID: 33253159
Sudden releases of gaseous fluoride emissions from various industrial facilities, although rare, do occur due to maintenance or failure of scrubbing equipment. Such a release was first suspected and then confirmed in the vicinity of the Rogaška Slatina glassworks based on the determination of total fluorine content in five different vegetation samples. All vegetation samples (Norway spruce, peach, common hornbeam, common bean and common grape vine) had visible signs of chlorotic and necrotic lesions. The results of the analyses reported according to the Guide for the Expression of Measurement Uncertainty (GUM) showed that the determined contents of fluorine were up to 125 times higher than in vegetation samples of vegetation from a clean area free from natural or anthropogenic fluoride emissions (10 mg/g), and that the gaseous fluorides were spread evenly in all directions according to an inverse power function. It was estimated that the food from the influenced area was suitable for human consumption at the distance of 559 m from the emitter and for animals at the distance of 378 m from the emitter. The results of our study suggest that: (1) more emphasis should be put on identifying possible accidental releases of gaseous or particulate fluorides, (2) awareness of food as a possible source of fluorine for humans and animals should be raised, (3) more attention should be put on the regulation concerning fluorine in human or animal foods, (4) research laboratories should be encouraged to report measurement results along with the measurement uncertainty (MU) estimated according to GUM, and (5) firm guidelines should be established on how to consider MU when reporting compliance with specifications.
COBISS.SI-ID: 32187687
Article summarizes main achievements of EU Adriatic Ionian Interreg framework financed project SUPER-LNG (Sustainability Performance of LNG-based maritime mobility). Within the project, we prepared guidelines and training programmes for safety reporting, reporting evaluation, risk assessment and emergency planning related to small scale LNG (Liquefied Natural Gas) storage and distribution facilities in ports for ships bunkering in order to promote safe transition to more clean fuel and thus more sustainable maritime mobility. Paper presents main elements of prepared guideline and summarizes the prepared training framework and programme for all interested stakeholders in coming LNG bunkering operations: port operators, maritime authorities, maritime instructors, planning authorities, licensing authorities and emergency planning & responding practitioners. The involved port operators warmly received the guidelines, as transition to LNG based maritime mobility is one of their strategical goals.
COBISS.SI-ID: 53244163