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Acta Chimica Slovenica

Xiu-Zhen Zhang, Yitong Gu, Yuntong Li, Andong Liu, Fuyao Liu, Zhonglu You, Hai-Liang Zhu
A novel 4,4'-bipyridine linked dinuclear copper(II) complex, [Cu2L2(bipy)](NO3)2·bipy (L = 2-[2-(2-hydroxyethylamino) ethylimino]methyl-6-methylphenol; bipy = 4,4'-bipyridine), was prepared and characterized by elemental analyses, IR spectroscopy, and single-crystal X-ray diffraction. The Cu···Cu distance is 11.129(2) Å. The CuII atom is coordinated by one phenolate O, one imine N, and one amine N atoms of a Schiff base ligand, and one N atom of the bridging 4,4'-bipyridine ligand, forming a square planar geometry...
December 2016: Acta Chimica Slovenica
Long Zhang, Zhong-Wei Man, Yan Zhang, Jing Hong, Meng-Ran Guo, Jie Qin
Four metal complexes based on quinoline carboxylate ligand from 2-(pyridin-4-yl)quinoline-4-carboxylic acid (HL), [ML2(H2O)2] · 2H2On (M = MnII, 1; M = CoII, 2; M = CdII, 3) and [Ag2L2(H2O)2] · 3H2On (4) have been synthesized under hydrothermal conditions. Their structures were determined by elemental analyses, IR spectra, and further characterized by single-crystal X-ray diffraction analysis. Complexes 1-3 feature a 1D chain structure which is further linked together to construct the 3D supramolecular network through hydrogen bonds...
December 2016: Acta Chimica Slovenica
Hicham Zaitan, Elham F Mohamed, Héctor Valdés, Mostafa Nawdali, Salah Rafqah, Marie Hélène Manero
A great number of pollution problems come as a result of the emission of Volatile Organic Compounds (VOCs) into the environment and their control becomes a serious challenge for the global chemical industry. Adsorption is a widely used technique for the removal of VOCs due to its high efficiency, low cost, and convenient operation. In this study, the feasibility to use a locally available clay, as adsorbent material to control VOCs emissions is evaluated. Natural clay is characterised by different physical-chemical methods and adsorptive interaction features between VOCs and natural clay are identified...
December 2016: Acta Chimica Slovenica
Nilgün Yücel Candan, Haklı Heybet Elif
Seed vigor is a complex physiological trait required to ensure the rapid and uniform emergence of plants in the field under different environmental conditions. Therefore, salicylic acid (SA, 0.5 mM) and calcium (Ca2+, 50 mM) priming were used as exogenous growth enhancers to stimulate wheat (Triticum durum Desf. cv. Yelken) seed vigor under high salinity. The main aim was to address whether priming of wheat with SA, Ca2+ and SA+Ca (SA, 0.5 mM + Ca2+, 50 mM; their combination) could bring about supplementary agronomic benefits particularly under stressful environments such as salinity...
December 2016: Acta Chimica Slovenica
Li Wang, Yong-Jun Han, Li Qing-Bin, Ling-Wei Xue
A novel dioxomolybdenum(VI) complex, [MoO2L(MeOH)], where L is the anion of 4-bromo-N'-(4-diethylamino-2-hydroxybenzylidene)benzohydrazide, has been synthesized and characterized by physico-chemical methods and single crystal X-ray determination. In the complex the Mo atom is in octahedral coordination, with three donor atoms of the hydrazone ligand, two oxo groups, and one methanol O atom. The complex exhibits catalytic property for the sulfoxidation reactions. In the presence of the complex a 93% conversion of the sulfide to the corresponding sulfoxide was observed within 60 min and the 100% conversion was achieved after 2 h...
December 2016: Acta Chimica Slovenica
Ya-Li Sang, Xue-Song Lin, Wei-Dong Sun
A new trifluoromethylsulfonate salt of 2-[(3-chloropyridinium-2-yl)hydrazonomethyl]-6-methoxyphenol, (HL)CF3SO3, and its copper(II) and cobalt(III) complexes, [CuL(OH2)]CF3SO3 · 0.5H2O (1) and [CoL2]CF3SO3 · CH3OH (2), were prepared and characterized by physico-chemical methods and single crystal X-ray analysis. A trifluoromethylsulfonate anion is present in each of the compounds. The Cu atom in complex 1 is coordinated by the phenolate O, imino N and pyridine N atoms of L ligand, giving square planar geometry...
December 2016: Acta Chimica Slovenica
Ali Tuncay Ozyilmaz, Gul Ozyilmaz, Ismail Hakki Karahan
Zinc-iron (ZnFe) and zinc-iron-cobalt (ZnFeCo) platings were achieved on carbon steel applying 3 mA current values. Then, oxalate (OX) and tartrate (Tart) passive layers obtained in sodium oxalate and sodium tartrate medium were formed on carbon steel, ZnFe and ZnFeCo plated carbon steel. SEM images showed that the passive layers on CS, CS/ZnFe and CS/ZnFeCo electrodes exhibited different crystal structures. Corrosion tests revealed that the ZnFeCo particles provided a significant barrier efficiency on CS layer when compared with ZnFe alloy plating...
December 2016: Acta Chimica Slovenica
Hossein Nikoofard, Malihe Solbi
An electro-chemically active composite film containing the environmentally friendly surfactant sodium dodecyl sulfate (SDS) and poly(1-amino-9,10-anthraquinone) (PAAQ) is used as an electron transfer mediator in the electro-chemical oxidation of catechol. Compared with the bare platinum (Pt) electrode, the Pt/PAAQ-SDS modified electrode remarkably lowers the anodic peak potential of catechol, and increases the peak currents. The results obtained indicate that the activation energy for the electro-chemical oxidation of catechol at the polymer film is low (7...
December 2016: Acta Chimica Slovenica
Fatemeh Moradgholi, Jalil Lari, Mahnaz Vahidi Parsa, Mehran Mirkharrazi
The aim of the research described was to study Rb2HPW12O40 as a green and heterogeneous catalyst for the Mannich reaction. One-pot multi-component condensation of an aldehyde, an amine and a ketone at ambient temperature affords the corresponding β-amino ketones using novel nano-sized Rb2HPW12O40. Simple purification, short reaction time and high yield are some of the advantages of this reaction. Also, the catalyst can be readily isolated. The nano catalyst Rb2HPW12O40 has been characterized by Fourier transform infrared spectroscopy, X-ray powder diffraction and scanning electron microscopy...
December 2016: Acta Chimica Slovenica
Peter Molek, Tomaž Bratkovič
Detailed knowledge of antigenic determinants is crucial when characterizing therapeutic and diagnostic antibodies, assessing vaccine effectiveness and developing epitope-based vaccines. Most epitope mapping approaches are labor intensive and costly. In this study, we evaluated panning of phage-displayed random peptide libraries against antibodies as a tool for cognate epitope identification. We used six antibodies directed to three model protein antigens as targets to show that the approach is applicable to both mono- and polyclonal antibodies...
December 2016: Acta Chimica Slovenica
Ali Mokhtari
In this study, a new method has been developed for the simple determination of mepivacaine (carbocaine). The method is based on the enhancement effect of mepivacaine in the chemiluminescence (CL) reaction of tris(1,10 phenanthroline) ruthenium(II) with cerium(IV). A mechanism for the CL reaction has been proposed on the basis of UV-Vis, fluorescent and CL spectra. Under optimum conditions, the CL intensity was proportional to the concentration of the drug in solution over the range 0.45-226.25 μg mL-1 (R2 = 0...
December 2016: Acta Chimica Slovenica
Mikhail Mikhailov Dmitrievich, Ilya Kolesnikov Evgen Evich, Alina Manshina Anvyarovna
Ag nanoparticles were synthesized as a result of irradiation of ammonia-alcoholic solution of AgNO3 with focused beam of Nd:YAG laser. The synthesized nanoparticles were characterized with SEM and EDX analysis, dynamic light scattering technique, absorption and luminescence spectroscopies. The average size of synthesized nanoparticles which is from 25 to 100 nm demonstrates a linear dependence on molar concentration of the used solution. Optical and luminescence properties of obtained Ag nanoparticles were demonstrated...
December 2016: Acta Chimica Slovenica
Lovel Kukuljan, Krištof Kranjc, Franc Perdih
The synthesis and crystal structures of 1-(5-methyl-1H-indol-6-yl)ethan-1-one (7), C11H11NO, and 1-3-[(dimethylamino) methyl]-5-methyl-1H-indol-6-ylethan-1-one (8), C14H18N2O, are reported. The synthesis is based on the Diels-Alder cycloaddition of a substituted 2H-pyran-2-one derivative, followed by an acid-catalyzed cyclization and concomitant deprotection (the last two steps were carried out as a one-pot domino process) yielding substituted indole 7, which was further derivatized via Mannich reaction to the gramine derivative 8...
December 2016: Acta Chimica Slovenica
Jovana Kos, Elizabet Janić Hajnal, Igor Jajić, Saša Krstović, Jasna Mastilović, Bojana Šarić, Pavle Jovanov
Presence of aflatoxin M1 (AFM1) in milk should be continuously controlled in order to protect the population from risks associated with its proven toxicity and carcinogenicity. During recent years, there has been an increase in demand for development of sensitive, accurate, simple and fast method which is reliable for detection of AFM1 at low concentrations found in milk samples. For that purpose, enzyme linked immunosorbent asssay (ELISA), high performance liquid chromatography with fluorescence detector (HPLC-FLD) and high performance liquid chromatography-tandem mass spectrometry (HPLC-MS/MS) were optimized and validated in order to apply them for AFM1 analysis in naturally contaminated milk samples, and to assess the closeness of agreement between results of three different methods...
December 2016: Acta Chimica Slovenica
Abedawn Ibrahim Khalaf, Ahmed A H Al-Kadhimi, Jaafar H Ali
The synthesis and biological activity of a variety of analogues to the naturally occurring antibacterial and antifungal Distamycin A were explored by a number of authors. These compounds were subject to a large array of assays. Some of these compounds showed high activity against a range of Gram-positive, Gram-negative bacteria as well as fungi. To explore the anti-parasitic activity of this class of compounds, specific modifications had to be made. A number of these compounds proved to be active against Trypanosoma brucei...
December 2016: Acta Chimica Slovenica
Stanislav Južnič
One of the most important Mid-European professor with more than six thousand academic descendants was the leading Slovenian erudite Jurij Vega. In broader sense, Vega's and other applied sciences of the south of Holy Roman Empire of German Nationality were connected with the mercury mine of Idrija during the last half of millennia. The Idrija Mine used to be one of the two top European producers of mercury, the basic substance of atomistic alchemists. Idrija Mine contributions to the history of techniques, their examinations and approbations is comparable to the other Mid-European achievements...
December 2016: Acta Chimica Slovenica
Tatyana Gor'kova, Mingqiang Liu, Mikhail Proskurnin, Mladen Franko
The optimum reaction parameters for the interaction of hexavalent chromium [Cr(VI)] with diphenylcarbazide in microfluidic chips (μFIA) with thermal-lens microscopic detection were selected. The characteristic feature of the applied flow scheme is the injection of the reagent into the stream containing the test metal, which enables in-field and real-time monitoring of Cr(VI) simply by flowing the sample continuously through the microchip. The limit of detection of Cr(VI) under the selected conditions (signal generating wavelength, 514...
December 2016: Acta Chimica Slovenica
Murat Genc, Zuhal Karagoz Genc, Suat Tekin, Suleyman Sandal, Muhammad Sirajuddin, Ben Hadda Taibi, Memet Sekerci
This article demonstrates the synthesis of 1,2,4-triazole derivatives and their applications in medicine particularly as anti-breast cancer agents which is a major issue of the present. The synthesized compounds were characterized by elemental analysis, FT-IR and NMR. DFT was used to study the quantum chemical calculations of geometries and vibrational wave numbers of 3-hydroxynaphthyl and p-tolyl substituted 1,2,4-triazoles in the ground state. The scaled harmonic vibrational frequencies obtained from the DFT method were compared with those of the FT-IR spectra and found good agreement...
December 2016: Acta Chimica Slovenica
Vesna Ferk Savec, Špela Hrast, Iztok Devetak, Gregor Torkar
When learning chemistry, students encounter various visualizations introducing scientific concepts and processes unobservable to the naked eye. It is often assumed that these visualizations support students' understanding and enable them to solve problems more efficiently. The research presented here investigates students' use of an explanatory key while solving tasks based on submicroscopic representations. The following features of the explanatory key were examined: 1) colored versus black-and-white, and 2) pictorial versus textual...
December 2016: Acta Chimica Slovenica
Ali Serol Ertürk, Mustafa Ulvi Gürbüz, Metin Tülü, Abdürrezzak Emin Bozdoğan
This study presents the synthesis and UV-Vis characterization of Cu nanocomposites from ethylenediamine (EDA) (E), diethylenetriamine (DETA) (D), and Jeffamine® T-403 (P) cored PAMAM dendrimers (PAMAMs) with TRIS and carboxyl surface functional groups. Cu-PAMAM dendrimer encapsulated nanoparticles (Cu-DENs) were characterized by UV-Vis spectroscopy. Disappearance of the 680 nm d-d transition and 270-300 nm ligand to metal charge transfer (LMCT) peaks and the formation of monotically increasing exponential band were used as the evidence of the successful synthesis of Cu-DENs in addition to immediate color change of dendrimer-metal mixture solutions from blue to golden brown by reduction...
December 2016: Acta Chimica Slovenica
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