Contribution describes two ways for the preparation on a laboratory scale of fluorinated aluminium(III) oxide, γ-Al2O3. Fluorinated γ-Al2O3 is frequently used as a basic model material in the investigations of fluoride or fluorinated catalysts, catalyst supports or solid acids. Importance of these reference materials can be noticed in the last years, when a variety of new nanostructured materials on the basis of aluminium(III) fluoride, AlF3, with unusually high surface area and acidity were developed. Within these studies, surface and catalytic properties of novel materials are usually compared with those of adequate, conventionally prepared reference materials, most frequently with well-defined fluorinated γ-Al2O3. Contribution was prepared at the invitation of the editor. Whole publication, designated also as »The definitive guide to creating fluorine-based compounds«, includes a variety of contributions devoted to the preparation of various compounds and materials that contain fluorine and are of current interest. The book represents an authoritative specialised manual. In addition, it contributes to the popularisation of this field of chemistry that can be experimentally very demanding.
B.06 Other
COBISS.SI-ID: 26345511Two aspects of XeF2 chemistry were presented at the symposium: its role as a ligand to metal centre and some of its oxidizing capabilities. Systematic investigations reactions of various salts Mn+(AF6¯)n with XeF2 in aHF solvent were preformed over the last decade. More than forty compounds of the type [Mn(XeF2)p](AF6)n were prepared and their crystal structures determined. Variety of structural types can be found: from molecular structure to three-dimensional network. In some cases compounds with two or even three metal centres with different coordination spheres were found. Xe2F3AF6 (A = Ru, Ir) were also used as starting materials for the preparation of the coordination compounds with XeF2. For their preparation the oxidizing power of XeF2 was employed. XeF2 is capable of oxidizing ruthenium and iridium metals in aHF to Ru(V) and Ir(V) fluorides.
B.04 Guest lecture
COBISS.SI-ID: 26973991Superconducting materials hold a great promise in addressing current global priority issues such as energy and the environment. Superconductivity was reported for the first time in polyaromatic molecular solid – alkali metal “doped” aromatic five-ring hydrocarbon system picene, C22H14 in 2010. Here we report on different preparation procedures on potassium triphenylide system with the intent to optimize old techniques and develop new ones. Solid state reactions were used first in order to collect basic data and study the behavior of triphenylene under reducing conditions at elevated temperatures and compare results. Resulting products were amorphous, containing larger amounts of unreacted starting materials. To increase rate of reaction and prevent surface passivation of starting compounds amine and ethers as solvents were tried with better results. Charge on triphenylide was controlled by molar ratio between metal potassium and triphenylene in all cases. Results show that reactions in solution lead to more homogeneous and crystalline products, while solid state reactions are unsuitable for the same task because of surface passivation of reactants.
B.04 Guest lecture
COBISS.SI-ID: 27211303In 2011, Prof. Boris Žemva received the highest scientific award in Slovenia, the Zois Award, for his lifetime achievements in the field of inorganic fluorine chemistry. The third issue of the Acta Chimica Slovenica in 2013 was dedicated to him. Fourteen articles from the research area of fluorine chemistry was submitted by co-workers and colleagues from Slovenia and from abroad (Japan, Ukraine, Poland, Germany, France and USA.
C.03 Guest-associated editor
COBISS.SI-ID: 26994215The synthesis of W5O14 nanofibers from vapor phase in the presence of nickel iodide is described in detail. W5O14 is relatively rare but very important tungsten oxide phase, the syntheses of which is very demanding. The applicability of W5O14 is in the field of optical devices like light-emitting diodes, laser diodes and display devices.
F.32 International patent
COBISS.SI-ID: 20624167