Brina Dojer

• Research Assistant at University of Maribor

We synthesized four new copper(II) complexes with acetato and chlorido ligands and methylammonium (MA), dimethylammonium (DMA), and tetramethylammonium (TMA) counterions: (MA)4[Cu2Ac4Cl2]Cl2·2H2O (1), (DMA)2[Cu2Ac4Cl2] (2), (DMA)4[Cu2Ac4Cl2]Cl2·2H2O (3), and (TMA)5[Cu2Ac4Cl]Cl4·4H2O (4). All compounds were characterized by single-crystal X-ray diff...

Efficiency of time use is a key factor in chemistry calculation tasks, affecting both, personal and professional domains. This study is dedicated to finding the fastest methods for accomplishing chemistry tasks. Our investigation delves into the comparative temporal outlays made by students as they engage three different approaches: using an electr...

V zadnjem desetletju smo priča velikim tehnološkim, družbenim in socialnim spremembam. Razlike med posamezniki v družbi so vse večje in kapitalizem počasi, a vztrajno spreminja človeške vrednote. Otroci so najbolj ranljivi deležniki te družbe, zato jim je potrebno zagotoviti kvalitetno vzgojo in izobraževanje. Vloga predmetnega učitelja v sodobni š...

Slovensko: V zadnjem desetletju smo priča velikim tehnološkim, družbenim in socialnim spremembam. Razlike med posamezniki v družbi so vse večje in kapitalizem počasi, a vztrajno spreminja človeške vrednote. Otroci so najbolj ranljivi deležniki te družbe, zato jim je potrebno zagotoviti kvalitetno vzgojo in izobraževanje. Vloga predmetnega učitelja...

Two new mononuclear complexes of iron(II) pyridinecarboxamides (picolinamide - pia, isonicotinamide - isn), [Fe(pia)3]•(SO4)•3H2O (1) and (isnH)2[Fe(isn)2(SO4)2(H2O)2]•H2O (2) have been synthesized by the reaction of iron(II) sulphate heptahydrate and pyridinecarboxamides in different solvents by standard method under reflux. Both compounds were ch...

The synthesis and characterization of two novel copper and nickel coordination compounds with 2-aminobenzothiazole is reported. The crystals were obtained after adding solid 2-aminobenzothiazole to a methanol solution of Cu(CH3COO)2·H2O and after adding a methanol solution of Ni(CH3COO)2·4H2O to a methanol solution of 2-aminobenzothiazole. The prod...

The shortage of qualified STEM teachers and researchers in these fields can be recognized as an existing and forthcoming problem. The aim of the present study was to explore the influence of the content of STEM subjects Biology, Chemistry, Informatics, Mathematics, Physics, and Technics and Technology and corresponding classroom experiences, as per...

Nickel and cobalt sulfides are promising materials in different cutting-edge research areas like solar cells, supercapacitors, catalysts, and electrode materials. Nickel and cobalt sulfides with various stoichiometries have been synthesized sonochemically from Ni(CH3COO)2 ∙ 4H2O, Co(CH3COO)2 ∙ 2H2O and different sulfur precursors using a direct imm...

The synthesis and characterization of two new zinc(II) coordination compounds with 3- and 4-aminopyridine are reported. They were obtained after dissolving Zn(CH3COO)2·2H2O in different solutions of 3- and 4-aminopyridine. The products were characterized structurally by single-crystal X-ray diffraction analysis. Colourless crystals of the compound...

New hydroxylammonium fluorometallates of manganese and scandium, with the formulas (NH3OH)(2)MnF4 and (NH3OH)(3)ScF6, were prepared by the reactions of hydroxylammonium fluoride with solutions of manganese or scandium in aqueous HF. (NH3OH)(2)MnF4 crystallizes monoclinic, P2(1)/c, the structure consisting of MnF6 octahedra sharing four of its verti...

The reaction products of PCl5 with 2,6-dimesityl-aniline and with naphthalene-1,5-diamine are 4-chloro-2,6-dimesityl-aniline and (2,4,6,8-tetrachloronaphthalene-1,5-diyl)bis(phosphor­imidic trichloride), respectively, and were characterized by X-ray crystallographic analyses. The phosphazene shows π-stacking, extremely large C–N–P angles, and extre...

This paper reports on the synthesis of a new hydroxylammonium fluoroferrate, with the formula (NH3OH)3FeF6, obtained after dissolving iron powder in hydrofluoric acid and adding solid NH3OHF. This new compound has been characterized by chemical and thermal analysis, single-crystal X-ray diffraction, and magnetic measurements. The title compound cry...

The magnetic properties of layered hydroxylammonium fluorocobaltate (NH(3)OH)(2)CoF(4) were investigated by measuring its dc magnetic susceptibility in zero-field-cooled (ZFC) and field-cooled (FC) regimes, its frequency dependent ac susceptibility, its isothermal magnetization curves after ZFC and FC regimes, and its heat capacity. Effects of pres...

AbstractHydroxylammonium fluoroaluminate with the formula (NH3OH)2AlF5 was synthesized by the reaction of solid NH3OHF and an aqueous solution of aluminum in HF, and its structure was determined by single-crystal X-ray diffraction. The structure consists of NH3OH+ cations and centrosymmetrical AlF6 octahedra, which are formed by sharing two opposit...

A new coordination compound of zinc fluoride and hydroxylammonium, (NH3OH)2ZnF4, was obtained after dissolving zinc powder in hydrofluoric acid (40%) and adding solid hydroxylammonium fluoride. The colourless crystals were characterised chemically, magnetically, structurally by single-crystal X-ray diffraction analysis, and thermogravimetrically by...

The synthesis and characterization of two new nickel(II) coordination compounds with 3- and 4-aminopyridine are reported. They were obtained after dissolving Ni(CH3COO)2·4H2O in different solutions of 3- and 4-aminopyridine. The products were characterized magnetically, structurally by single-crystal X-ray diffraction analysis, and spectrally by FT...

Three coordination compounds of cobalt(II) acetate with 2–, 3– and 4–aminopyridine were obtained after dissolving Co(CH3COO)2·2H2O and Co(CH3COO)2·4H2O in different solutions of aminopyridines. All three products were characterized magnetically, structurally by single–crystal X–ray diffraction analysis and spectrally by FT–IR spectroscopy. The reac...

Effect of pressure on magnetic properties of a bulk fluoro-metal complex (NH3OH)2MF4 was studied. Magnetization measurements suggest that a ferromagnetic transition at TC1 = 47 K is followed by a ferrimagnetic one at TC2 = 3 K. Both transition temperatures are pressure dependent with the pressure coefficients dT C1=dp = -2:6 K/GPa and dTC2=dp = 0:2...

The structures of the new compounds (II) and (IV) are determined by single crysal XRD.

The first layered hydroxylammonium fluorometalates, (NH3OH)2CuF4 and (NH3OH)2CoF4, were prepared by the reaction of solid NH3OHF and the aqueous solution of copper or cobalt in HF. Both compounds crystallize in monoclinic, P21/c, unit cell with parameters: a=7.9617(2)Å, b=5.9527(2)Å, c=5.8060(2)Å, β=95.226(2)° for (NH3OH)2CuF4 and a=8.1764(3)Å, b=5...

The synthesis and characterization of two polymorphic modifications of new cobalt coordination compound with 2-aminopyridine are reported. The modifications were prepared by the reaction of a solution of cobalt acetate tetrahydrate and 2-aminopyridine. The crystal structures of both polymorphic modifications have been determined by single-crystal X...

Turquoise crystals of a new hydroxylammonium compound with the formula NH4(NH3OH)2[VOF5] have been synthesized by the reaction of solid NH3OHF and the aqueous solution of vanadium in HF. The compound crystallizes monoclinic, P21/n, with cell parameters: a = 10.5658(2) Å, b = 6.6143(1) Å, c = 11.6618(2) Å, β = 96.282(1). Magnetic susceptibility was...