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Timişoara, Romania

Pascariu M.-C.,Vasile Goldis Western University of Arad | Niculescu M.,Chemeia Semper Association | Niculescu M.,Polytechnic University of Timisoara | Belengeanu D.,Vasile Goldis Western University of Arad | And 5 more authors.
Revista de Chimie | Year: 2015

To better understand the behavior of riboflavin, epinephrine, chloramphenicol, metronidazole and dipyridamole under electron ionization mass spectrometric conditions, we have performed quantum chemical calculations on their radical cations, using both RM1 (Recife Model 1) and PM7 (Parameterized Model 7) semi-empirical methods. These attempts were generally aimed at explaining the shapes of their respective El-MS spectra, especially regarding the high intensity of some fragmentation ions obtained in positive mode ionization. Source

Birzescu M.,Polytechnic University of Timisoara | Milea M.,Polytechnic University of Timisoara | Rosu D.,Polytechnic University of Timisoara | Ledeti I.,Victor Babes University of Medicine and Pharmacy Timisoara | And 3 more authors.
Revue Roumaine de Chimie | Year: 2014

This paper presents the experimental results of the synthesis and thermal analysis of the nickel(II) oxalate, a homopolynuclear coordination compound obtained through the RedOx reaction which took place between ethylene glycol and Ni(NO3)2• 6H2O. The reaction between ethylene glycol and Ni(NO3) 2• 6H2O occurs with the oxidation of ethylene glycol to the oxalate anion, C2O4 2- (L) under the chosen experimental conditions. The synthesized homopolynuclear coordination compound, having as ligand the oxalate anion, was characterized by chemical analysis, magnetic measurements, electronic and vibrational spectra and thermal analysis. The thermal behaviour of the polynuclear coordination compound has been investigated by TG, DTG and DTA. Nickel oxide obtained by thermal decomposition of this compound was characterized by IR spectroscopy and X-ray diffraction (XRD). Source

Niculescu M.,Chemeia Semper Association | Magda A.,Polytechnic University of Timisoara | Jurca M.,Polytechnic University of Timisoara | Costea L.,Polytechnic University of Timisoara | Pode V.,Polytechnic University of Timisoara
Revista de Chimie | Year: 2015

Our paper presents the experimental results of the thermal analysis of Ni(II)-polynuclear coordination compound having as ligand 3-hydroxypropionate anion (L), which is oxidation product of 1, 3-propanediol. The reaction between 1, 3-propanediol and Ni(NO3)2×6H2O occurs, under specific working conditions, with the oxidation of 1, 3-propanediol to the 3-hydroxypropionate anion (HO-CH2-CH2-COO-). The thermal properties of the synthesized polynuclear coordination compound have been investigated by TG, DTG and DTA. The kinetic analysis of the nonisothermal data has been carried out through the isoconversional method. The simple oxide obtained through thermolysis was characterized by IR, X-ray spectroscopy, scanning electron microscopy (SEM) and elemental analysis. Source

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