Synthesis and properties of lanthanide(III) complexes with 4-hydroxy-3,5-dimethoxybenzoic acid
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M. Iwan
,
A. Kula
Abstract
Complexes of yttrium(III) and lanthanides(III) with 4-hydroxy-3,5-dimethoxybenzoic (syringic) acid were obtained as solids with metal to ligand mole ratio of 1: 3. The compounds were characterized by elemental analysis, IR spectroscopy, X-ray diffraction patterns, solubility, and thermal studies. The complexes are sparingly soluble in water and stable at room temperature. Compounds of light lanthanides (from La to Nd) are hydrated and they crystallize in a triclinic system. When heated, they lose water molecules in one step and in the next step they decompose to oxides. Complexes of yttrium and other lanthanides are anhydrous and crystallize in a monoclinic system. They are stable up to 300°C and then decompose to oxides. As the coordination number of lanthanide ions is usually equal to 9 or 8, one can suppose that hydroxy or methoxy groups take part in the coordination of these metal ions.
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© 2007 Institute of Chemistry, Slovak Academy of Sciences
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Artikel in diesem Heft
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- Evaluation of colon cancer elements contents in serum using statistical methods
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- Properties of fructosyltransferase from Aureobasidium pullulans immobilized on an acrylic carrier
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- Thermal decomposition kinetics of strontium oxalate
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- Influence of photoinitiator and curing conditions on polymerization kinetics and gloss of UV-cured coatings
- Interactions in iron gall inks
- Bimolecular reduction of 9-alkyl-3-nitrocarbazoles
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