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S. C. Mojumdar - One of the best experts on this subject based on the ideXlab platform.
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Thermal properties of solid complexes with biologically important Heterocyclic Ligands
Journal of Thermal Analysis and Calorimetry, 2012Co-Authors: E. Jóna, L’. Lajdová, S. Lendvayová, P. Lizák, M. Loduhová, V. Pavlík, J. Moncol’, S. C. MojumdarAbstract:Thermogravimetry (TG), derivative thermogravimetry (DTG) and infrared (IR) spectroscopy have been applied to the investigation of the thermal behaviour and structure of the compounds [Cu(2-Clbz)_2(nia)_2(H_2O)_2] (I), [Cu(2-Clbz)_2(nia)_2]·H_2O (II), [Cu(2-Brbz)_2(nia)_2]·2H_2O (III), [Cu(2-Brbz)_2(nia)_2(H_2O)] (IV), where 2-Clbz and 2-Brbz = 2-chloro- and 2-bromobenzoate anions, nia = nicotinamide, H_2O = water molecules. Thermal decomposition of all studied compounds proceeds in three steps. Heating the compounds first results in a release of non-coordinated and/or coordinated water molecules. The final product of thermal decomposition was CuO. The thermal stability of the complexes can be ordered in the sequence: I
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Thermal properties of solid complexes with biologically important Heterocyclic Ligands
Journal of Thermal Analysis and Calorimetry, 2011Co-Authors: E. Jóna, L’. Lajdová, L’. Kvasnicová, S. Lendvayová, M. Pajtášová, D. Ondrušová, P. Lizák, S. C. MojumdarAbstract:The thermal decomposition of the complexes Mg(SCN)_2(2-OHpy)_4·H_2O(I), Mg(SCN)_2(quin)_4·2H_2O(II) and Mg(SCN)(quinox)_4·5H_2O(III) (2-OHpy–2-hydroxypyridine, quin–quinoline, quinox–quinoxaline) has been investigated in static air atmosphere at 20–1000 °C by means of thermogravimetry (TG), differential thermal analysis (DTA), and infrared (IR) spectroscopy. The composition of the complexes had been identified by means of elemental analysis and complexometric titration. The possible scheme of destruction of the complexes is suggested. The final product of the thermal decomposition was MgS. IR data suggest that Heterocyclic Ligands were coordinated to Mg(II) through the nitrogen atom of their Heterocyclic ring. Thiocyanate group is also coordinated through the nitrogen atom.
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Thermal properties of solid complexes with biologically important Heterocyclic Ligands : Part II. Stoichiometry of thermal decomposition and infrared spectra of thiocyanatocobalt(II) complexes with furopyridine and furopyridine derivatives ()
Journal of Thermal Analysis and Calorimetry, 2010Co-Authors: L’. Lajdová, E. Jóna, L’. Kvasnicová, J. Miklovič, P. Segl’a, S. Šnircová, R. Janík, S. C. MojumdarAbstract:The stoichiometry of thermal decomposition of the complexes Co(NCS) 2 (fpy) 4 (I), Co(NCS) 2 (Mefpy) 4 (II) and Co(NCS) 2 (bfpy) 4 (III) (where fpy = furo[3,2-c]pyridine, Mefpy = methylfuro[3,2-c]pyridine, bfpy = benzo-[2, 3]furo[3,2-c]pyridine) have been investigated in nitrogen atmosphere from room temperature (RT) to 800 °C by means of TG and DTA. The results revealed that release of Heterocyclic Ligands occurs in one step. Infrared data suggested that fpy, Mefpy and bfpy were coordinated to Co(II) through the nitrogen atom of the respective Heterocyclic ring and anionic Ligands through nitrogen atom of the NCS groups.
E. Jóna - One of the best experts on this subject based on the ideXlab platform.
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Thermal properties of solid complexes with biologically important Heterocyclic Ligands
Journal of Thermal Analysis and Calorimetry, 2012Co-Authors: E. Jóna, L’. Lajdová, S. Lendvayová, P. Lizák, M. Loduhová, V. Pavlík, J. Moncol’, S. C. MojumdarAbstract:Thermogravimetry (TG), derivative thermogravimetry (DTG) and infrared (IR) spectroscopy have been applied to the investigation of the thermal behaviour and structure of the compounds [Cu(2-Clbz)_2(nia)_2(H_2O)_2] (I), [Cu(2-Clbz)_2(nia)_2]·H_2O (II), [Cu(2-Brbz)_2(nia)_2]·2H_2O (III), [Cu(2-Brbz)_2(nia)_2(H_2O)] (IV), where 2-Clbz and 2-Brbz = 2-chloro- and 2-bromobenzoate anions, nia = nicotinamide, H_2O = water molecules. Thermal decomposition of all studied compounds proceeds in three steps. Heating the compounds first results in a release of non-coordinated and/or coordinated water molecules. The final product of thermal decomposition was CuO. The thermal stability of the complexes can be ordered in the sequence: I
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Thermal properties of solid complexes with biologically important Heterocyclic Ligands
Journal of Thermal Analysis and Calorimetry, 2011Co-Authors: E. Jóna, L’. Lajdová, L’. Kvasnicová, S. Lendvayová, M. Pajtášová, D. Ondrušová, P. Lizák, S. C. MojumdarAbstract:The thermal decomposition of the complexes Mg(SCN)_2(2-OHpy)_4·H_2O(I), Mg(SCN)_2(quin)_4·2H_2O(II) and Mg(SCN)(quinox)_4·5H_2O(III) (2-OHpy–2-hydroxypyridine, quin–quinoline, quinox–quinoxaline) has been investigated in static air atmosphere at 20–1000 °C by means of thermogravimetry (TG), differential thermal analysis (DTA), and infrared (IR) spectroscopy. The composition of the complexes had been identified by means of elemental analysis and complexometric titration. The possible scheme of destruction of the complexes is suggested. The final product of the thermal decomposition was MgS. IR data suggest that Heterocyclic Ligands were coordinated to Mg(II) through the nitrogen atom of their Heterocyclic ring. Thiocyanate group is also coordinated through the nitrogen atom.
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Thermal properties of solid complexes with biologically important Heterocyclic Ligands : Part II. Stoichiometry of thermal decomposition and infrared spectra of thiocyanatocobalt(II) complexes with furopyridine and furopyridine derivatives ()
Journal of Thermal Analysis and Calorimetry, 2010Co-Authors: L’. Lajdová, E. Jóna, L’. Kvasnicová, J. Miklovič, P. Segl’a, S. Šnircová, R. Janík, S. C. MojumdarAbstract:The stoichiometry of thermal decomposition of the complexes Co(NCS) 2 (fpy) 4 (I), Co(NCS) 2 (Mefpy) 4 (II) and Co(NCS) 2 (bfpy) 4 (III) (where fpy = furo[3,2-c]pyridine, Mefpy = methylfuro[3,2-c]pyridine, bfpy = benzo-[2, 3]furo[3,2-c]pyridine) have been investigated in nitrogen atmosphere from room temperature (RT) to 800 °C by means of TG and DTA. The results revealed that release of Heterocyclic Ligands occurs in one step. Infrared data suggested that fpy, Mefpy and bfpy were coordinated to Co(II) through the nitrogen atom of the respective Heterocyclic ring and anionic Ligands through nitrogen atom of the NCS groups.
L’. Lajdová - One of the best experts on this subject based on the ideXlab platform.
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Thermal properties of solid complexes with biologically important Heterocyclic Ligands
Journal of Thermal Analysis and Calorimetry, 2012Co-Authors: E. Jóna, L’. Lajdová, S. Lendvayová, P. Lizák, M. Loduhová, V. Pavlík, J. Moncol’, S. C. MojumdarAbstract:Thermogravimetry (TG), derivative thermogravimetry (DTG) and infrared (IR) spectroscopy have been applied to the investigation of the thermal behaviour and structure of the compounds [Cu(2-Clbz)_2(nia)_2(H_2O)_2] (I), [Cu(2-Clbz)_2(nia)_2]·H_2O (II), [Cu(2-Brbz)_2(nia)_2]·2H_2O (III), [Cu(2-Brbz)_2(nia)_2(H_2O)] (IV), where 2-Clbz and 2-Brbz = 2-chloro- and 2-bromobenzoate anions, nia = nicotinamide, H_2O = water molecules. Thermal decomposition of all studied compounds proceeds in three steps. Heating the compounds first results in a release of non-coordinated and/or coordinated water molecules. The final product of thermal decomposition was CuO. The thermal stability of the complexes can be ordered in the sequence: I
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Thermal properties of solid complexes with biologically important Heterocyclic Ligands
Journal of Thermal Analysis and Calorimetry, 2011Co-Authors: E. Jóna, L’. Lajdová, L’. Kvasnicová, S. Lendvayová, M. Pajtášová, D. Ondrušová, P. Lizák, S. C. MojumdarAbstract:The thermal decomposition of the complexes Mg(SCN)_2(2-OHpy)_4·H_2O(I), Mg(SCN)_2(quin)_4·2H_2O(II) and Mg(SCN)(quinox)_4·5H_2O(III) (2-OHpy–2-hydroxypyridine, quin–quinoline, quinox–quinoxaline) has been investigated in static air atmosphere at 20–1000 °C by means of thermogravimetry (TG), differential thermal analysis (DTA), and infrared (IR) spectroscopy. The composition of the complexes had been identified by means of elemental analysis and complexometric titration. The possible scheme of destruction of the complexes is suggested. The final product of the thermal decomposition was MgS. IR data suggest that Heterocyclic Ligands were coordinated to Mg(II) through the nitrogen atom of their Heterocyclic ring. Thiocyanate group is also coordinated through the nitrogen atom.
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Thermal properties of solid complexes with biologically important Heterocyclic Ligands : Part II. Stoichiometry of thermal decomposition and infrared spectra of thiocyanatocobalt(II) complexes with furopyridine and furopyridine derivatives ()
Journal of Thermal Analysis and Calorimetry, 2010Co-Authors: L’. Lajdová, E. Jóna, L’. Kvasnicová, J. Miklovič, P. Segl’a, S. Šnircová, R. Janík, S. C. MojumdarAbstract:The stoichiometry of thermal decomposition of the complexes Co(NCS) 2 (fpy) 4 (I), Co(NCS) 2 (Mefpy) 4 (II) and Co(NCS) 2 (bfpy) 4 (III) (where fpy = furo[3,2-c]pyridine, Mefpy = methylfuro[3,2-c]pyridine, bfpy = benzo-[2, 3]furo[3,2-c]pyridine) have been investigated in nitrogen atmosphere from room temperature (RT) to 800 °C by means of TG and DTA. The results revealed that release of Heterocyclic Ligands occurs in one step. Infrared data suggested that fpy, Mefpy and bfpy were coordinated to Co(II) through the nitrogen atom of the respective Heterocyclic ring and anionic Ligands through nitrogen atom of the NCS groups.
L’. Kvasnicová - One of the best experts on this subject based on the ideXlab platform.
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Thermal properties of solid complexes with biologically important Heterocyclic Ligands
Journal of Thermal Analysis and Calorimetry, 2011Co-Authors: E. Jóna, L’. Lajdová, L’. Kvasnicová, S. Lendvayová, M. Pajtášová, D. Ondrušová, P. Lizák, S. C. MojumdarAbstract:The thermal decomposition of the complexes Mg(SCN)_2(2-OHpy)_4·H_2O(I), Mg(SCN)_2(quin)_4·2H_2O(II) and Mg(SCN)(quinox)_4·5H_2O(III) (2-OHpy–2-hydroxypyridine, quin–quinoline, quinox–quinoxaline) has been investigated in static air atmosphere at 20–1000 °C by means of thermogravimetry (TG), differential thermal analysis (DTA), and infrared (IR) spectroscopy. The composition of the complexes had been identified by means of elemental analysis and complexometric titration. The possible scheme of destruction of the complexes is suggested. The final product of the thermal decomposition was MgS. IR data suggest that Heterocyclic Ligands were coordinated to Mg(II) through the nitrogen atom of their Heterocyclic ring. Thiocyanate group is also coordinated through the nitrogen atom.
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Thermal properties of solid complexes with biologically important Heterocyclic Ligands : Part II. Stoichiometry of thermal decomposition and infrared spectra of thiocyanatocobalt(II) complexes with furopyridine and furopyridine derivatives ()
Journal of Thermal Analysis and Calorimetry, 2010Co-Authors: L’. Lajdová, E. Jóna, L’. Kvasnicová, J. Miklovič, P. Segl’a, S. Šnircová, R. Janík, S. C. MojumdarAbstract:The stoichiometry of thermal decomposition of the complexes Co(NCS) 2 (fpy) 4 (I), Co(NCS) 2 (Mefpy) 4 (II) and Co(NCS) 2 (bfpy) 4 (III) (where fpy = furo[3,2-c]pyridine, Mefpy = methylfuro[3,2-c]pyridine, bfpy = benzo-[2, 3]furo[3,2-c]pyridine) have been investigated in nitrogen atmosphere from room temperature (RT) to 800 °C by means of TG and DTA. The results revealed that release of Heterocyclic Ligands occurs in one step. Infrared data suggested that fpy, Mefpy and bfpy were coordinated to Co(II) through the nitrogen atom of the respective Heterocyclic ring and anionic Ligands through nitrogen atom of the NCS groups.
E. Juhászová - One of the best experts on this subject based on the ideXlab platform.
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Biological and physicochemical study of zinc(II) propionate complexes with N-donor Heterocyclic Ligands
Journal of Thermal Analysis and Calorimetry, 2003Co-Authors: K. Györyová, Erika Szunyogová, Jana Kovářová, Daniela Hudecová, Dagmar Mudroňová, E. JuhászováAbstract:New zinc(II) propionate complexes (CH3CH2COO)2Zn·Ln·xH2O, where n=1-2, x=0 or 2, were prepared by reaction of zinc(II) propionate with Heterocyclic Ligands (L=theophylline, nicotinamide, methyl-3-pyridyl carbamate) and their thermal properties were studied. The prepared complex compounds were characterized by elemental analysis and IR spectra. TG/DTG and DTA measurements of the prepared compounds were performed in the air atmosphere under dynamic conditions. The thermal decomposition can be characterized as a multi-step process. The first step is attributed to the elimination of water or N-donor ligand molecules. It is followed by the decomposition of propionate anion when diethyl ketone and carbon dioxide were released. Zinc oxide was found as a final product of the thermal decomposition of the complex compounds under study. The volatile intermediate products of the thermal decomposition of zinc(II) propionate complexes were identified by IR-spectroscopy, qualitative chemical analyses and final solid product by X-ray powder diffraction method. Moreover, IR spectra suggest monodentate coordination of propionate anion to zinc. The complexes were tested against bacteria and filamentous fungi and show both antimicrobial activity and fungistatic effect towards pathogens as well as probiotic activity towards Lactobacillus paracasei.