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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 and Characterization of New d11 Metal Complexes with 4,4'-Bipyridine and Formates

Czakis-Sulikowska D., Radwańska-Doczekalska J., Markiewicz M.

Polish Journal of Chemistry

2003

Vol. 77 / nr 10

1255-1261

New mixed-ligand complexes of the stoichiometric formulae: Mn(4-bpy)2(HCOO)2_2H2O, Co(4-bpy)(HCOO)2_H2O, Ni(4-bpy)(HCOO)2_4H2O, Cu(4-bpy)(HCOO)2_H2O, Zn2(4-bpy)3(HCOO)4 and Cd(4-bpy)(HCOO)2 (where 4-bpy = 4,4_-bipyridine) have been isolated in pure state. The IR and VIS spectra (for compounds of Co(II), Ni(II), Cu(II)), molar conductivity measurements and other physical properties of these compounds are discussed. Thermal behaviour of all compounds was studied by means of DTA, DTG, TG techniques under static conditions in air. The resultant final products were the metal oxide in all cases. A coupled TG-MS system was used to analysis of princpal volatile thermal decomposition (or fragmentation) products of Co(II) and Ni(II) complexes. The principal volatile mass fragments correspond to: C+, OH+, H2O+, NO+,CO2 + and other.