Thermal and spectral studies of rare earth element 3-methoxy-4-methylbenzonates

Brzyska, W.; Ożga, W.

doi:10.1007/s10973-005-0466-0

Cited by 8 publications

(8 citation statements)

References 8 publications

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“…14,15 In addition, lanthanide ions have a high spin ground state and magnetic anisotropy according to their 4f valence electron spin-orbit coupling effect. [21][22][23][24] On the other hand, 1,10-phenanthroline is used mostly as a secondary ligand in lanthanide complexes for good coordination ability which can enhance the stability and luminescence properties of the complexes. 16 Nowadays, the research of lanthanide complexes in biotechnological fields has become more and more important.…”

Section: Introductionmentioning

confidence: 99%

Preparation, characterization and properties of four new trivalent lanthanide complexes constructed using 2-bromine-5-methoxybenzoic acid and 1,10-phenanthroline

et al. 2015

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Four dinuclear trivalent lanthanide complexes of the general formula [Ln2(2-Br-5-MOBA)6(phen)2] (Ln = Nd(), Sm(), Ho(), Er(); 2-Br-5-MOBA = 2-bromine-5-methoxybenzoate, phen = 1,10-phenanthroline) were prepared and structurally characterized. The complexes to are isostructural with a coordination number of nine. The carboxylic acid ligands adopt bridging, bidentate chelating, and tridentate chelating bridging modes to coordinate with Ln(iii) ions. The structures of the complexes were confirmed on the basis of elemental analysis, molar conductance, thermogravimetric analysis (TGA), and IR and UV spectra. The heat capacities and thermal circulating processes of the prepared complexes were performed on a differential scanning calorimeter under a nitrogen atmosphere. Two remarkable solid-solid phase transitions existed both in the heat capacities and thermal circulating processes. The bacteriostatic activities of the complexes were evaluated against Candida albicans, Escherichia coli and Staphylococcus aureus. Besides, the luminescent property of complex was also investigated, and the magnetic properties of complexes and were also discussed in detail.

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Section: Introductionmentioning

confidence: 99%

Preparation, characterization and properties of four new trivalent lanthanide complexes constructed using 2-bromine-5-methoxybenzoic acid and 1,10-phenanthroline

et al. 2015

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“…The bands of symmetric vibrations m s (OCO) are similarly split but they appear in the range from 1393 to 1367 cm -1 . The splitting of m as (OCO) and m s (OCO) bands confirms that carboxylate groups have different coordination modes [38,39]. The separation Dm = m as (OCO)-m s (OCO) characterizes the nature of metal-carboxylate bond.…”

Section: Resultsmentioning

confidence: 80%

“…The weakest bonded (5) O3-Ln1-O8 153.94 (10) 153.87 (5) 153.82 (10) O3-Ln1-O1 85.64 (9) 85.54 (5) 85.43 (9) O8-Ln1-O1 78.92 (9) 79.08 (5) 79.18 (9) O3-Ln1-O7 97.74 (10) 97.91 (6) 97.78 (10) O8-Ln1-O7 96.17 (10) 96.31 (6) 96.40 (10) O1-Ln1-O7 69.06(9) 69.47 (5) 69.27 (9) O3-Ln1-O9 91.55(9) 91.17 (5) 91.26 (9) O8-Ln1-O9 88.62 (9) 88.77 (5) 88.75 (9) O1-Ln1-O9 143.47 (9) 143.30 (5) 143.51 (9) O7-Ln1-O9 147.06 (10) 146.89 (5) 146.89 (10) O3-Ln1-O6 128.64 (9) 128.69 (5) 128.80 (9) O8-Ln1-O6 76. 38 (Table 3). In the structures can be also found short intermolecular C-HÁÁÁO, C-HÁÁÁCl (Table 3) contacts, which can be considered as weak hydrogen bonds [32,33] and pÁÁÁÁp contacts (Table 4) which can be interpreted as stacking interactions [34].…”

Section: Resultsmentioning

confidence: 99%

Synthesis, crystal structure and other properties of the complexes of Er(III), Yb(III) and Lu(III) with 4,4′-bipyridine and dichloroacetates

et al. 2009

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A novel mixed-ligand complexes of Er(III), Yb(III) and Lu(III) with title ligands were prepared and characterized by chemical and elemental analysis and IR spectroscopy, conductivity (in methanol, dimethyloformamide and dimethylsulphoxide). The thermal properties of complexes in the solid state were studied. The mode of metal-ligand coordination was discussed. The title compounds are isomorphic and isostructural in solid state. All atoms in studied compounds lie in general positions but occurrence of inversion on the midpoint of the bond linking two pyridine rings leads to existence in asymmetric unit one complex molecule and half of outer coordination sphere 4-bpy molecule. All chelating carboxylate groups are symmetrically bonded to the metal cations. The molecules of studied compounds are connected to the three dimensional network via O-HÁÁÁO and O-HÁÁÁN intermolecular hydrogen bonds. In the structures also exist C-HÁÁÁO, C-HÁÁÁCl weak hydrogen bonds and pÁÁÁÁp stacking interactions.

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“…In the hetero-metallic 4f-3d complexes with the quinolinic ligand, each of the metal ions supplements its CN: 3d ions to 6, 4f ions to 8 or 9, by bonding the ancillary, small ligands. Structures of these compounds depend on the type of solvent, metal-ligand ratio, temperature and pH of synthesis [33,34]. The ligands, which supplement the coordination sphere of metal ions for example water molecules, DMSO and so on, can be easily removed from the coordination sphere without the lanthanide-organic framework collapse.…”

Section: Introductionmentioning

confidence: 99%

Thermal behaviour of light lanthanide(III) complexes with 2,3-pyridinedicarboxylic acid

Rzączyńska¹,

Danczowska-Burdona²,

Drewniak³

2014

Annales UMCS, Chemia

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The lanthanide(III) complexes with 2,3-pyridinedicarboxylate ligand (PDC) were obtained as crystalline compounds from the water solutions. These compounds form the series of Ln 2 (PDC) 3 · nH 2 O. All compounds are stable in air and insoluble in both water and common organic solvents. The hydrated complexes have been characterized by elemental analysis, thermal analysis (TG/DSC/DTA, and TG−FT-IR), FT-IR spectroscopy and X-ray analysis. 2,3-pyridinedicarboxylates of lanthanides(III) are stable in air below 313−323 K. Upon heating, hydrated complexes lose crystallization and lattice water in two steps. The values of dehydration enthalpy complexes are calculated from the DSC curves. The anhydrous compounds are stable at the temperature from 473 K to about 623 K and when heated they decompose to lanthanide oxides. Thermal and spectroscopic studies are essential for further studies and classification of compounds as MOF-like structures.

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Thermal and spectral studies of rare earth element 3-methoxy-4-methylbenzonates

Cited by 8 publications

References 8 publications

Preparation, characterization and properties of four new trivalent lanthanide complexes constructed using 2-bromine-5-methoxybenzoic acid and 1,10-phenanthroline

Preparation, characterization and properties of four new trivalent lanthanide complexes constructed using 2-bromine-5-methoxybenzoic acid and 1,10-phenanthroline

Synthesis, crystal structure and other properties of the complexes of Er(III), Yb(III) and Lu(III) with 4,4′-bipyridine and dichloroacetates

Thermal behaviour of light lanthanide(III) complexes with 2,3-pyridinedicarboxylic acid

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