scholarly journals Complexes of 4-chlorophenoxyacetates of Nd(III), Gd(III) and Ho(III)

2018 ◽  
Vol 35 (1) ◽  
pp. 67
Author(s):  
W. Ferenc ◽  
M. Bernat ◽  
J. Sarzyński ◽  
H. Głuchowska
Keyword(s):  
Thermal Decomposition ◽  
Magnetic Moments ◽  
X Ray Diffraction ◽  
Magnetic Studies ◽  
Bridging Ligands ◽  
X Ray ◽  
Gaseous Products ◽  
Carboxylate Groups ◽  
One Step ◽  
Ligand Fields

The complexes of 4-chlorophenoxyacetates of Nd(III), Gd(III) and Ho(III) have been synthesized as polycrystalline hydrated solids, and characterized by  elemental analysis, spectroscopy, magnetic studies and also by X-ray diffraction and thermogravimetric measurements. The analysed complexes have the following colours: violet for Nd(III), white for Gd(III) and cream for Ho(III) compounds. The carboxylate groups bind as bidentate chelating (Ho) or bridging ligands (Nd, Gd). On heating to 1173K in air the complexes decompose in  several steps. At first, they dehydrate in one step to form anhydrous salts, that next decompose to the oxides of respective metals. The gaseous products of their thermal decomposition in nitrogen were also determined and the magnetic susceptibilites were measured over the temperature range of 76-303K and the magnetic moments were calculated. The results show that 4-chlorophenoxyacetates of Nd(III), Gd(III) and Ho(III) are high-spin complexes with weak ligand fields. The solubility value in water at 293K for analysed  4-chlorophenoxyacetates is in the order of 10-4mol/dm3.

scholarly journals Physicochemical properties of 3, 4, 5–trimethoxybenzoates of Mn(II), Co(II), Ni(II), Cu(II) and Zn(II)

2005 ◽  
Vol 70 (8-9) ◽  
pp. 1075-1088 ◽  
Author(s):  
Wieslawa Ferenc ◽  
Agnieszka Walków-Dziewulska ◽  
Jan Sarzynski
Keyword(s):  
Ir Spectroscopy ◽  
Magnetic Moments ◽  
X Ray Diffraction ◽  
Acid Anion ◽  
Magnetic Studies ◽  
Bridging Ligands ◽  
Magnetic Susceptibilities ◽  
X Ray ◽  
Carboxylate Groups ◽  
One Step

The complexes of Mn(II), Co(II), Ni(II), Cu(II) and Zn(II) with 3,4,5-trimethoxybenzoic acid anion of the formula: M(C10H11O5)2.nH2O, where n = 6 for Ni(II), n = 1 for Mn(II), Co(II), Cu(II), and n = 0 for Zn, have been synthesized and characterized by elemental analysis, IR spectroscopy X?ray diffraction measurements, thermogravimetry and magnetic studies. They are crystalline compounds characterized by various symmetry. They decompose in various ways when heated in air to 1273 K. At first, they dehydrate in one step and form anhydrous salts. The final products of decomposition are oxides of the respective metals (Mn2O3, Co3O4, NiO, CuO, ZnO). The solubilities of the analysed complexes in water at 293 K are in the orders of 10-2 ? 10-4 mol dm-3. The magnetic susceptibilities of the Mn(II), Co(II), Ni(II) and Cu(II) complexes were measured over the range of 76?303 K and the magnetic moments were calculated. The results show that the 3,4,5-trimethoxybenzoates of Mn(II), Co(II) and Ni(II) are high-spin complexes but that of Cu(II) forms a dimer [Cu2(C10H11O5)4(H2O)2]. The carboxylate groups bind as monodentate or bidentate chelating or bridging ligands.

scholarly journals Spectral, thermal and magnetic characterization of 2, 3-dimethoxybenzoates of Co(II), Ni(II) and Cu(II)

2005 ◽  
Vol 70 (6) ◽  
pp. 833-842 ◽  
Author(s):  
Wieslawa Ferenc ◽  
Agnieszka Walkow-Dziewulska ◽  
Pawel Sadowsk ◽  
Janusz Chrusciel
Keyword(s):  
Magnetic Moments ◽  
Electronic Spectroscopy ◽  
X Ray Diffraction ◽  
Magnetic Studies ◽  
Thermal Stabilities ◽  
Bridging Ligands ◽  
X Ray ◽  
Carboxylate Groups ◽  
Polycrystalline Solids

Complexes of 2,3-dimethoxybenzoates of Co(II), Ni(II) and Cu(II) have been synthesized as hydrated or anhydrous polycrystalline solids and characterized by elemental analysis, IR, FIR and electronic spectroscopy, magnetic studies and X-ray diffraction measurements. The carboxylate groups bind as monodentate or symmetrical, bidentate chelating and bridging ligands. The thermal stabilities were determined in air. When heated they dehydrate to form anhydrous salts which are decomposed to the oxides of the respective metals. The magnetic susceptibilities of the complexes were measured over the range 77?300 K and the magnetic moments were calculated. The results show that the complexes of Ni(II) and Co(II) are high-spin complexes and that of Cu(II) forms a dimer.

scholarly journals The physico-chemical properties of 4-chlorophenoxyacetates of Mn(II), Co(II), Ni(II) and Cu(II)

2018 ◽  
Vol 33 (1) ◽  
pp. 07
Author(s):  
W. Ferenc ◽  
M. Bernat ◽  
J. Sarzynski ◽  
B. Paszkowska
Keyword(s):  
Magnetic Moments ◽  
Chemical Properties ◽  
Bidentate Ligands ◽  
X Ray Diffraction ◽  
Magnetic Studies ◽  
X Ray ◽  
Physico Chemical ◽  
One Step ◽  
Polycrystalline Solids ◽  
Ligand Fields

The complexes of 4-chlorophenoxyacetates of Mn(II), Co(II), Ni(II) and Cu(II) have been synthesized as polycrystalline solids, and characterized by elemental analysis, spectroscopy, magnetic studies and also by X-ray diffraction and thermogravimetric measurements. The analysed complexes have the following colours: pink for Co(II), green for Ni(II), blue for Cu(II) and a pale pink for Mn(II) compounds. The carboxylate group binds as monodentate and bidentate ligands. On heating to 1173K in air the complexes decompose in several steps. At first, they dehydrate in one step to anhydrous salts, that next decompose to the oxides of respective metals. Their magnetic moments were determined in the range of 76-303K. The results reveal them to be high-spin complexes of weak ligand fields.

scholarly journals Magnetic, thermal and spectroscopic properties of lanthanide(III) 2-(4-chlorophenoxy) acetates, Ln(C8H6ClO3)3•nH2O

2013 ◽  
Vol 78 (9) ◽  
pp. 1335-1349 ◽  
Author(s):  
Wiesława Ferenc ◽  
Beata Cristóvão ◽  
Jan Sarzyński
Keyword(s):  
Magnetic Moments ◽  
Intermediate Formation ◽  
Spectroscopic Properties ◽  
Ligand Field ◽  
X Ray Diffraction ◽  
Magnetic Susceptibilities ◽  
X Ray ◽  
Gaseous Products ◽  
Carboxylate Groups ◽  
Thermogravimetric Studies

4-Chlorophenoxyacetates of lanthanides(III) were synthesized as polycrystalline hydrated solids with the general formulae: Ln(C8H6ClO3)3?2H2O (Ln = La(III), Pr(III), Sm(III), Eu(III) and Tb(III)), Ln(C8H6ClO3)3?H2O (Ln = Dy(III)) and Ln(C8H6ClO3)3?3H2O (Ln = Er(III), Tm(III), Yb(III) and Lu(III) and characterized by elemental analysis, FTIR spectroscopy, magnetic and thermogravimetric studies and also by X-ray diffraction (XRD) measurements. The complexes have colours typical for lanthanide(III) ions. The carboxylate groups bind as bidentate chelating. On heating to 1273 K in air the complexes decompose in three steps. At first they dehydrate in one stage to form anhydrous salts that next decompose to the oxides of respective metals with the intermediate formation of their oxychlorides. The gaseous products of compound thermal decomposition in nitrogen were also determined and the magnetic susceptibilities were measured over the ranges 76-303K and 1.8-303K, and their magnetic moments were calculated. The results show that 4-chlorophenoxyacetates of lanthanides(III) are high-spin complexes with weak ligand field.

Complexes of Light Lanthanides with 3,4-Dimethoxybenzoic Acid

2000 ◽  
Vol 65 (2) ◽  
pp. 179-191 ◽  
Author(s):  
Wiesława Ferenc ◽  
Agnieszka Walków-Dziewulska
Keyword(s):  
Magnetic Moments ◽  
Intermediate Formation ◽  
Lanthanide Ions ◽  
Ligand Field ◽  
X Ray Diffraction ◽  
Magnetic Studies ◽  
X Ray ◽  
Light Lanthanides ◽  
Polycrystalline Solids ◽  
Van Vleck

The complexes of light lanthanides with 3,4-dimethoxybenzoic acid, Ln(C9H9O4)3·4 H2O, where Ln = La(III), Ce(III), Pr(III), Nd(III), Sm(III), Eu(III) and Gd(III), have been synthesized as polycrystalline solids and characterized by elemental analysis, IR spectroscopy, thermogravimetric and magnetic studies and X-ray diffraction measurements. The complexes possess colours typical of Ln(III) ions (La, Ce, Eu, Gd white, Pr greenish, Nd violet and Sm cream). The carboxylate group in these complexes binds as a symmetrical, bidentate chelating ligand. On heating in air to 1 273 K the 3,4-dimethoxybenzoates of Ce(III), Pr(III), Sm(III), Eu(III) and Gd(III) first dehydrate to anhydrous salts that further decompose to oxides of the respective metals. The 3,4-dimethoxybenzoates of La(III) and Nd(III) decompose in three steps. Firstly, they dehydrate to anhydrous salts that further decompose to the oxides with the intermediate formation of oxycarbonates. The solubilities of the studied complexes in water at 293 K is in the order of 10-4-10-3 mol dm-3. Their magnetic moments were determined in the temperature range 77-298 K and found to obey the Curie-Weiss law. The values of μeff calculated for the all compounds (except that for Eu) are close to those obtained for Ln(III) by Hund and van Vleck. The results show that there is no influence of the ligand field on 4f electrons of the lanthanide ions in these polycrystalline compounds; 4f electrons probably do not participate in the formation of the Ln-O bonds.

scholarly journals Magnetic, thermal and spectral characterization of 2,6-dimethoxybenzoates of Co(II), Ni(II) and Cu(II)

2006 ◽  
Vol 31 (2) ◽  
pp. 17-24 ◽  
Author(s):  
W. Ferenc ◽  
A. Walków-Dziewulska ◽  
J. Sarzynski
Keyword(s):  
Elemental Analysis ◽  
Magnetic Moments ◽  
Chelating Ligands ◽  
Carboxylate Group ◽  
X Ray Diffraction ◽  
Acid Anion ◽  
Magnetic Studies ◽  
X Ray ◽  
Polycrystalline Solids

The complexes of 2,6-dimethoxybenzoic acid anion with ions of Co(II), Ni(II), and Cu(II) have been synthesized as polycrystalline solids, and characterized by elemental analysis, spectroscopy, magnetic studies, and also by X-ray diffraction and thermogravimetric measurements. The analysed complexes have following colours: pink for Co(II), green for Ni(II), and blue for Cu(II) compounds. The carboxylate group binds as monodentate, and bidentate bridging and chelating ligands. On heating in air to 1173 K the complexes decompose in four, three or two steps. At first, they dehydrate in one or two steps to anhydrous salts, that next decompose to oxides of the respective metals. The solubility of the investigated dimethoxybenzoates in water at 293 K is of the order of 10-2 mol/dm3. Their magnetic moments were determined in the temperature range of 76-303 K. The results reveal the compounds of Co(II) and Ni(II) to be high-spin complexes and that of Cu(II) to form dimer.

Synthesis and thermal decomposition of magnesium dicarbide

1983 ◽  
Vol 48 (7) ◽  
pp. 1969-1976 ◽  
Author(s):  
Bohumil Hájek ◽  
Pavel Karen ◽  
Vlastimil Brožek
Keyword(s):  
Thermal Decomposition ◽  
Arrhenius Equation ◽  
Kinetic Equations ◽  
Optimum Temperature ◽  
X Ray Diffraction ◽  
X Ray ◽  
Gaseous Products ◽  
Controlled Porosity ◽  
Diffraction Patterns ◽  
High Yields

The conditions of formation of magnesium dicarbide from magnesium and acetylene were investigated; the optimum temperature, reaction period, and acetylene flow rate were sought so as to achieve high yields of dicarbide and minimize the free carbon deposit. The porosity of the magnesium dust was found to have a pronounced effect upon the yield; a considerable improvement was achieved by pressing the dust into pellets with controlled porosity. The powder X-ray diffraction patterns of MgC2 samples were studied. The intense reflection could be indexed for the bet symmetry (a = 392.9 ± 0.6 pm, c = 503.7 ± 1.2 pm), but as the intensity calculations for dicarbide models with different arrangements of the C22- groups indicate, the symmetry of the MgC2 lattice will be lower than tetragonal. The thermal decomposition of the dicarbide leading to sesquicarbide was examined in dependence on time and temperature by hydrolyzing the samples and analyzing the gaseous products by GLC. Due to the thermal decomposition, traces of sesquicarbide appear even during the dicarbide synthesis. The decomposition process was approximated by kinetic equations. The Arrhenius equation constants, in the temperature region of 485-560 °C, are AA = 4.97 . 1012 s-1, EA = 257 kJ mol-1.

scholarly journals New Coordination Polymers of Selected Lanthanides with 1,2-Phenylenediacetate Linker: Structures, Thermal and Luminescence Properties

Materials ◽  
2021 ◽  
Vol 14 (17) ◽  
pp. 4871
Author(s):  
Renata Łyszczek ◽  
Iwona Rusinek ◽  
Agnieszka Ostasz ◽  
Justyna Sienkiewicz-Gromiuk ◽  
Dmytro Vlasyuk ◽  
...  
Keyword(s):  
Single Crystal ◽  
Coordination Polymers ◽  
Structural Similarity ◽  
Spectroscopic Properties ◽  
Luminescence Spectroscopy ◽  
X Ray Diffraction ◽  
Metal Centers ◽  
X Ray ◽  
Gaseous Products ◽  
Carboxylate Groups

Solvothermal reactions of lanthanide (III) salts with 1,2-phenylenediacetic acid in N,N′-dimethylformamide (DMF) solvent lead to the formation of the metal complexes of the general formula Ln2(1,2-pda)3(DMF)2, where Ln(III) = Pr(1), Sm(2), Eu(3), Tb(4), Dy(5), and Er(6), 1,2-pda = [C6H4(CH2COO)2]2−. The compounds were characterized by elemental analysis, powder and single-crystal X-ray diffraction methods, thermal analysis methods (TG-DSC and TG-FTIR), infrared and luminescence spectroscopy. They exhibit structural similarity in the two groups (Pr, Sm, and Eu; Tb, Dy, and Er), which was reflected in their thermal behaviours and spectroscopic properties. Single-crystal X-ray diffraction studies reveal that Sm(2) and Eu(3) complexes form 2D coordination polymers with four crystallographically independent metal centers. Every second lanthanide ion is additionally coordinated by two DMF molecules. The 1,2-phenylenediacetate linker shows different denticity being: penta- and hexadentate while carboxylate groups exhibit bidentate-bridging, bidentate-chelating, and three-dentate bridging-chelating modes. The infrared spectra reflect divergence between these two groups of complexes. The complexes of lighter lanthanides contain in the structure coordinated DMF molecules, while in the structures of heavier complexes, DMF molecules appear in the inner and outer coordination sphere. Both carboxylate groups are deprotonated and engaged in the coordination of metal centers but in different ways in such groups of complexes. In the groups, the thermal decomposition of the isostructural complexes occurs similarly. Pyrolysis of complexes takes place with the formation of such gaseous products as DMF, carbon oxides, ortho-xylene, ethers, water, carboxylic acids, and esters. The complexes of Eu and Tb exhibit characteristic luminescence in the VIS region, while the erbium complex emits NIR wavelength.

scholarly journals The physico-chemical properties of 2-methoxyphenoxyacetates of Mn(II), Co(II), Ni(II) and Cu(II)

2018 ◽  
Vol 35 (2) ◽  
pp. 89
Author(s):  
W. Ferenc ◽  
M. Bernat ◽  
J. Sarzyński
Keyword(s):  
Magnetic Moments ◽  
Chemical Properties ◽  
Intermediate Formation ◽  
Bidentate Ligands ◽  
X Ray Diffraction ◽  
Solubility In Water ◽  
Physico Chemical ◽  
One Step ◽  
Thermogravimetric Studies ◽  
Ligand Fields

The complexes of 2-methoxyhenoxyacetates of Mn(II), Co(II), Ni(II) and  Cu(II)with the general formula: M(C9H9O4)3·4H2O, where M(II) = Mn, Co, Ni and Cu have been synthesized and characterized by elemental analysis, IR spectroscopy, magnetic and thermogravimetric studies and also X-ray diffraction measurements. The complexes have colours typical for M(II) ions (Mn(II) - a pale pink, Co(II) - pink, Ni(II) - green, and Cu(II) – blue). The carboxylate group binds as monodentate and bidentate ligands. On heating to 1273K in air thecomplexes decompose in the same way. At first, they dehydrate in one step to anhydrous salts, that next decompose to the oxides of respective metals with the intermediate formation of the oxycarbonates. Their solubility in water at 293K is of the order of 10-5 mol·dm-3. The magnetic moments of analysed complexes were determined in the range of 76-303K. The results reveal them to be high-spin complexes of weak ligand fields.

Synthesis, Crystal Structure and Thermal Decomposition Mechanism of a Dysprosium(III) p-Fluorobenzoate 1,10-Phenanthroline Complex

2007 ◽  
Vol 62 (1) ◽  
pp. 51-54 ◽  
Author(s):  
Su-Ling Xu ◽  
Jian-Jun Zhang ◽  
Hui-Fang Yang ◽  
Ning Ren ◽  
Hai-Yan Zhang
Keyword(s):  
Crystal Structure ◽  
Thermal Decomposition ◽  
Molar Conductance ◽  
Thermal Decomposition Mechanism ◽  
Carboxylate Group ◽  
X Ray Diffraction ◽  
Triclinic Space Group ◽  
X Ray ◽  
Carboxylate Groups ◽  
Phenanthroline Complex

A dinuclear dysprosium(III) p-fluorobenzoate 1,10-phenanthroline complex, [Dy(p-FBA)3phen]2 was synthesized and characterized by elemental analysis, UV and IR spectroscopy, single crystal X-ray diffraction, molar conductance, and TG-DTG techniques. It crystallizes in the triclinic space group P1̄ with a = 9.895(5), b = 11.754(6), c = 14.756(10)Å ; α = 106.660(9)°, β = 107.956(9)°, γ =101.472(7)°; Z =1. The Dy(III) ions are eight coordinate including one terminal bidentate chelating carboxylate group, four bridging carboxylate groups and one 1,10-phenanthroline molecule. The thermal decomposition of [Dy(p-FBA)3phen]2 has been followed by thermal analysis. The lifetime equation at weight-loss of 10% was deduced as lnτ = −27.0798 +19010.2434/T by isothermal thermogravimetric analysis.

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