Complexes of Light Lanthanides with 3,4-Dimethoxybenzoic Acid

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Title:Complexes of Light Lanthanides with 3,4-Dimethoxybenzoic Acid
Creators:
Ferenc, Wiesława
Walków-Dziewulska, Agnieszka
Journal or Publication Title:
Collection of Czechoslovak Chemical Communications, 65, 2, pp. 179-191
Uncontrolled Keywords:Magnetic moments, 3,4-Dimethoxybenzoates, Thermal stability, Light lanthanides, Lanthanoids, Powder X-ray diffraction, IR spectroscopy, Rare earth elements

Abstract

The complexes of light lanthanides with 3,4-dimethoxybenzoic acid, Ln(C<sub>9</sub>H<sub>9</sub>O<sub>4</sub>)<sub>3</sub>·4&nbsp;H<sub>2</sub>O, 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<sup>-4</sup>-10<sup>-3</sup> mol dm<sup>-3</sup>. Their magnetic moments were determined in the temperature range 77-298 K and found to obey the Curie-Weiss law. The values of μ<sub>eff</sub> 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. <p>

Title:Complexes of Light Lanthanides with 3,4-Dimethoxybenzoic Acid
Creators:
Ferenc, Wiesława
Walków-Dziewulska, Agnieszka
Uncontrolled Keywords:Magnetic moments, 3,4-Dimethoxybenzoates, Thermal stability, Light lanthanides, Lanthanoids, Powder X-ray diffraction, IR spectroscopy, Rare earth elements
Divisions:Life and Chemical Sciences > Institute of Organic Chemistry and Biochemistry > Collection of Czechoslovak Chemical Communications
Journal or Publication Title:Collection of Czechoslovak Chemical Communications
Volume:65
Number:2
Page Range:pp. 179-191
ISSN:0010-0765
E-ISSN:1212-6950
Publisher:Institute of Organic Chemistry and Biochemistry
Related URLs:
URLURL Type
http://dx.doi.org/10.1135/cccc20000179UNSPECIFIED
ID Code:1634
Item Type:Article
Deposited On:06 Feb 2009 17:11
Last Modified:06 Feb 2009 16:11

Citation

Ferenc, Wiesława; Walków-Dziewulska, Agnieszka (2000) Complexes of Light Lanthanides with 3,4-Dimethoxybenzoic Acid. Collection of Czechoslovak Chemical Communications, 65 (2). pp. 179-191. ISSN 0010-0765

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