Wyniki wyszukiwania - BazTech

Ograniczanie wyników

2 Polish Journal of Chemistry

Powiadomienia systemowe

Sesja wygasła!

Znaleziono wyników: 2

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: dichloroacetate

Sortuj według:

Ogranicz wyniki do:

Synthesis and Properties of Complexes of Gd(III), Tb(III), Ho(III) and Tm(III) with 4,4'-Bipyridine and Dichloroacetates

Czakis-Sulikowska D., Czylkowska A., Markiewicz M., Frajtak M.

Polish Journal of Chemistry

2009

Vol. 83, nr 11

1893-1901

New mixed-ligand complexes of general formulae Ln(4-bpy)(CCl2HCOO)3źnH2O (4-bpy = 4,4'-bipyridine, Ln = lanthanide(III), n = 1 for Gd, n = 2 for Tb, Ho) and Tm(4-bpy)1.5(CCl2HCOO)3ź3H2O have been prepared and characterized by elemental and thermal analysis, IR spectroscopy and conductivity studies. The thermal properties of complexes were investigated in air atmosphere. During the heating the complexes decompose via intermediates to the oxides: Ln2O3 and Tb4O7. The principal volatile products of pyrolytic decomposition of Ho(III) and Tm(III) complexes, detected by a coupled TG-MS system are: C+, H2O+, CO2 + and species containing halogens and nitrogen. IR spectra suggest that 4-bpy and dichloroacetate groups are coordinated with Ln(III) ions.

Synthesis, Characterization and Thermal Decomposition of Yttrium and Light Lanthanides with 4,4'-Bipyridine and Dichloroacetates

Czakis-Sulikowska D., Czylkowska A., Markiewicz M.

Polish Journal of Chemistry

2007

Vol. 81, nr 7

1267-1275

A novel mixed-ligand complexes with empirical formulae: Ln(4-bpy)(CCl2HCOO)3.H2O (where:Ln =Y, Ce,Nd, Pr andEu, 4-bpy = 4,4'-bipyridine) were prepared and characterized by chemical and elemental analysis, IR spectroscopy and conductivity measurements (in methanol, dimethylformamide and dimethylsulfoxide). Analysis of the powder diffraction patterns showed that the obtained complexes are crystalline and isostructural compounds. The thermal properties of complexes in the solid state were studied under non-isothermal conditions in air atmosphere. During heating the complexes decompose via intermediate products to the oxides: Ln2O3 (Y, Nd, Eu), Pr6O11 and CeO2. A coupled TG-MS system was used to analyse principal volatile thermal decomposition (or fragmentation) products evolved during pyrolysis of Pr(III) and Nd(III) complexes. In air major profiles for ion currents are observed with m/z = 12, 18, 29, 30, 35, 36, 44, 47 amongst others.