The Experts below are selected from a list of 49623 Experts worldwide ranked by ideXlab platform

Oana Carp - One of the best experts on this subject based on the ideXlab platform.

  • THE INFLUENCE OF THE CENTRAL METALLIC ION ON THE THERMAL BEHAVIOUR OF SOLID Coordination Compounds
    ChemInform, 2009
    Co-Authors: Oana Carp
    Abstract:

    The paper is dedicated to an analysis of the central metallic ions effect on the solid Coordination Compounds thermal behaviour expressed by the decomposition temperature, decomposition stoichiometry and activation parameters. The influence of several properties of the central metallic ions such as ionic radius, electronic configuration of the last electronic shell, ionic potential on the thermal decomposition of solid Coordination Compounds is scrutinized.

  • thermal decomposition of some copper iron polynuclear Coordination Compounds containing glycine as ligand precursors of copper ferrite
    Thermochimica Acta, 2006
    Co-Authors: Oana Carp, Dana Gingasu, Ioana Mindru, Luminita Patron
    Abstract:

    Abstract The thermal behaviour of three Coordination Compounds, precursors of copper ferrite, namely [Fe 2 Cu(NH 2 CH 2 COOH) 4.5 ](NO 3 ) 8 ·4H 2 O (I), [Fe 2 Cu(NH 2 CH 2 COO) 4 (OH) 3 ](NO 3 )·H 2 O (II) and [Fe 2 Cu(NH 2 CH 2 COO) 6 (NH 2 CH 2 COOH) 2 ](NO 3 ) 2 (III), has been investigated. For a complete and reliable assignment of the thermal transformations, the isolable intermediates and end products were characterized by IR and X-ray diffraction. The Coordination Compounds which undergo a stepwise decomposition in the temperature range 60–375 °C are less stable than free glycine (206–375 °C), indicating the occurrence of some self-propagating reactions. The nitrate/glycine ratio contained by the parent Coordination compound, affects the final decomposition temperature (decreases as the ratio increases) but not the decomposition mechanism, and the mean particles size of the decomposition end product Fe 2 CuO 4 (an optimum value has to be found in order to avoid local combustion occurrences).

  • Polynuclear Coordination Compounds as precursors for CuFe2O4
    Journal of Materials Chemistry, 2002
    Co-Authors: Gabriela Marinescu, Oana Carp, Luminita Patron, Lucian Diamandescu, Nicolae Stanica, Aurelia Meghea, Maria Brezeanu, Jean-claude Grenier, Jean Etourneau
    Abstract:

    The possibility of obtaining copper ferrite through the thermal decomposition of the two polynuclear Coordination Compounds: (NH4)8[Fe2Cu(C2O4)8] (I) and [Fe2Cu(C2O4)2(OH)4]·4H2O (II) was considered. The polynuclear Compounds were characterized by various physical chemical techniques, e.g., IR, UV-VIS, EPR, Mossbauer spectra, thermal analysis and magnetic measurements. The final products obtained after thermal decomposition of the complex Compounds were analysed by X-ray diffraction. A mixture of tetragonal CuFe2O4, α-Fe2O3 and CuO is generated from the thermolysis of compound I, while a clean tetragonal CuFe2O4 with saturation magnetization of 26.89 emu g−1 is obtained from compound II.

  • some polynuclear Coordination Compounds precursors of chromites synthesis physicochemical characterization and thermal stability
    Journal of Thermal Analysis and Calorimetry, 1999
    Co-Authors: V Pocol, Oana Carp, Luminita Patron, Nicolae Stanica, Maria Brezeanu, E. Segal, D Crisan
    Abstract:

    The polynuclear Coordination Compounds LnCr(tartrate)3·nH2O where Ln(III)=La-Er, obtained through a precipitation method, were characterized on the basis of elemental analysis, their electronic and vibrational spectra and magnetic susceptibility measurements. The possibility of obtaining chromites through the transformations of the polynuclear Coordination Compounds in the solid state was considered. The thermal decompositions of these Compounds, studied by TG and DTA methods, were found to follow an almost uniform pattern. The decompositions occurred in six-eight steps. The first two steps involved dehydration, and the third the transformation of tartrate anions to oxalate, followed by conversion to carbonate and oxocarbonate intermediates. The final product in each case was LnCrO3. A non-isothermal kinetic analysis of the first decomposition steps was performed, the most probable decomposition mechanism being selected and the kinetic parameters evaluated. The final products of the transformations were characterized.

Luminita Patron - One of the best experts on this subject based on the ideXlab platform.

  • thermal decomposition of some copper iron polynuclear Coordination Compounds containing glycine as ligand precursors of copper ferrite
    Thermochimica Acta, 2006
    Co-Authors: Oana Carp, Dana Gingasu, Ioana Mindru, Luminita Patron
    Abstract:

    Abstract The thermal behaviour of three Coordination Compounds, precursors of copper ferrite, namely [Fe 2 Cu(NH 2 CH 2 COOH) 4.5 ](NO 3 ) 8 ·4H 2 O (I), [Fe 2 Cu(NH 2 CH 2 COO) 4 (OH) 3 ](NO 3 )·H 2 O (II) and [Fe 2 Cu(NH 2 CH 2 COO) 6 (NH 2 CH 2 COOH) 2 ](NO 3 ) 2 (III), has been investigated. For a complete and reliable assignment of the thermal transformations, the isolable intermediates and end products were characterized by IR and X-ray diffraction. The Coordination Compounds which undergo a stepwise decomposition in the temperature range 60–375 °C are less stable than free glycine (206–375 °C), indicating the occurrence of some self-propagating reactions. The nitrate/glycine ratio contained by the parent Coordination compound, affects the final decomposition temperature (decreases as the ratio increases) but not the decomposition mechanism, and the mean particles size of the decomposition end product Fe 2 CuO 4 (an optimum value has to be found in order to avoid local combustion occurrences).

  • Polynuclear Coordination Compounds as precursors for CuFe2O4
    Journal of Materials Chemistry, 2002
    Co-Authors: Gabriela Marinescu, Oana Carp, Luminita Patron, Lucian Diamandescu, Nicolae Stanica, Aurelia Meghea, Maria Brezeanu, Jean-claude Grenier, Jean Etourneau
    Abstract:

    The possibility of obtaining copper ferrite through the thermal decomposition of the two polynuclear Coordination Compounds: (NH4)8[Fe2Cu(C2O4)8] (I) and [Fe2Cu(C2O4)2(OH)4]·4H2O (II) was considered. The polynuclear Compounds were characterized by various physical chemical techniques, e.g., IR, UV-VIS, EPR, Mossbauer spectra, thermal analysis and magnetic measurements. The final products obtained after thermal decomposition of the complex Compounds were analysed by X-ray diffraction. A mixture of tetragonal CuFe2O4, α-Fe2O3 and CuO is generated from the thermolysis of compound I, while a clean tetragonal CuFe2O4 with saturation magnetization of 26.89 emu g−1 is obtained from compound II.

  • some polynuclear Coordination Compounds precursors of chromites synthesis physicochemical characterization and thermal stability
    Journal of Thermal Analysis and Calorimetry, 1999
    Co-Authors: V Pocol, Oana Carp, Luminita Patron, Nicolae Stanica, Maria Brezeanu, E. Segal, D Crisan
    Abstract:

    The polynuclear Coordination Compounds LnCr(tartrate)3·nH2O where Ln(III)=La-Er, obtained through a precipitation method, were characterized on the basis of elemental analysis, their electronic and vibrational spectra and magnetic susceptibility measurements. The possibility of obtaining chromites through the transformations of the polynuclear Coordination Compounds in the solid state was considered. The thermal decompositions of these Compounds, studied by TG and DTA methods, were found to follow an almost uniform pattern. The decompositions occurred in six-eight steps. The first two steps involved dehydration, and the third the transformation of tartrate anions to oxalate, followed by conversion to carbonate and oxocarbonate intermediates. The final product in each case was LnCrO3. A non-isothermal kinetic analysis of the first decomposition steps was performed, the most probable decomposition mechanism being selected and the kinetic parameters evaluated. The final products of the transformations were characterized.

D Crisan - One of the best experts on this subject based on the ideXlab platform.

  • some polynuclear Coordination Compounds precursors of chromites synthesis physicochemical characterization and thermal stability
    Journal of Thermal Analysis and Calorimetry, 1999
    Co-Authors: V Pocol, Oana Carp, Luminita Patron, Nicolae Stanica, Maria Brezeanu, E. Segal, D Crisan
    Abstract:

    The polynuclear Coordination Compounds LnCr(tartrate)3·nH2O where Ln(III)=La-Er, obtained through a precipitation method, were characterized on the basis of elemental analysis, their electronic and vibrational spectra and magnetic susceptibility measurements. The possibility of obtaining chromites through the transformations of the polynuclear Coordination Compounds in the solid state was considered. The thermal decompositions of these Compounds, studied by TG and DTA methods, were found to follow an almost uniform pattern. The decompositions occurred in six-eight steps. The first two steps involved dehydration, and the third the transformation of tartrate anions to oxalate, followed by conversion to carbonate and oxocarbonate intermediates. The final product in each case was LnCrO3. A non-isothermal kinetic analysis of the first decomposition steps was performed, the most probable decomposition mechanism being selected and the kinetic parameters evaluated. The final products of the transformations were characterized.

Katharina M. Fromm - One of the best experts on this subject based on the ideXlab platform.

  • Silver Coordination Compounds with antimicrobial properties
    Applied Organometallic Chemistry, 2013
    Co-Authors: Katharina M. Fromm
    Abstract:

    Silver and its Compounds have long been known to possess antimicrobial properties. We report here on our observations in this field of research, namely on silver Coordination Compounds, and in particular polymers, which can be used in the medical field. An overview of the structural diversity of Coordination Compounds with a particular class of organic ligands is given, together with their properties, with a special focus on antimicrobial activity, solubility and light stability. Copyright © 2013 John Wiley & Sons, Ltd.

Zhao-peng Qi - One of the best experts on this subject based on the ideXlab platform.

  • Synthesis, structures and luminescent studies of five metal Coordination Compounds with a pyridine-containing tripodal ligand
    Polyhedron, 2015
    Co-Authors: Zhao-peng Qi, Pei-yu Li, Lei Xu
    Abstract:

    Abstract Five new Coordination Compounds, [Ag2(L3)2]·(ClO4)2 (1), [Zn(L3)(Cl)]·(ClO4)·H2O (2) [Zn2(L3)(Cl)4] (3), [Cu(L3)(Cl)]·(Cl)·2H2O (4) and [Cd(L3)(Cl)(H2O)]·(ClO4)·H2O (5), with the tripodal ligand N1-(2-amino-ethyl)-N1-pyridin-3-ylmethyl-ethane- 1,2-diamine (L3) have been synthesized. Interestingly, Coordination compound 1 shows a dinuclear structure, Coordination Compounds 2, 4 and 5 display 1D zig-zag chain structures, and Coordination compound 3 exhibits an uncommon 1D chain structure. The results showed that the metal ions and anions have a distinct impact on the frameworks of the Coordination Compounds. The photoluminescent properties of the ligand and Coordination Compounds were also investigated.

  • Synthesis and properties of three Coordination Compounds with a monodentate Schiff-base ligand
    Polyhedron, 2014
    Co-Authors: Zhao-peng Qi, Hui Zhang
    Abstract:

    Abstract Three new Coordination Compounds have been synthesized with new Schiff-base ligand (3-imidazole-1-yl-propyl)-(4-nitro-benzylidene)-amine (L), and their structures were characterized by X-ray crystallography. Interestingly, the Coordination Compounds have diverse structures from mononuclear [Co(L)4(SCN)2] (1), dinuclear [Cu2(L)4(SCN)4] (2), to one-dimensional double chain polynuclear [Cd(L)2(SCN)2]n (3) with different Coordination mode of thiocyanate anions. The results indicated that the metal ions have a remarkable impact on the frameworks of the Coordination Compounds. Also, the pH has moderate influence, and metal/ligand ratio, temperature have little influence on the formation of Compounds 1–3. Meanwhile, the magnetic susceptibility of Coordination compound 2 and the photoluminescent property of Coordination compound 3 are discussed.