Synthesis, characterization and thermal behavior of some addition compounds between rare earth picrates (pic) and 2,2′-dithiobis(pyridine-N-oxide)

Synthesis, characterization and thermal behavior of some addition compounds between rare earth picrates (pic) and 2,2′-dithiobis(pyridine-N-oxide)

Rare earth picrates addition compounds with 2,2′-dithiobis(pyridine-N-oxide) (dithio) were synthesized and characterized. CHN analysis suggest a general formula Ln(pic) 3·1.5dithio·4H 2O (Ln = La, Nd, Eu, Dy, Ho). IR spectra indicate: (a) the presence of water molecules; (b) the presence of picrate...

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Bibliographic Details
Published in:Thermochimica acta Vol. 344; no. 1; pp. 67 - 72
Main Authors: Marinho, E.P, de Sousa, W.S.C, Melo, D.M.A, Zinner, L.B, Zinner, K, Mercuri, L.P, Vicentini, G
Format: Journal Article Conference Proceeding
Language:English
Published: Amsterdam Elsevier B.V 28-01-2000
Elsevier Science
Subjects:
2,2′-Dithiobis(pyridine-N-oxide)
Chemistry
Coordination compounds
Exact sciences and technology
Inorganic chemistry and origins of life
Picrates
Preparations and properties
Rare earth
Synthesis and characterization
Thermogravimetry
Picrates
Rare earth
Synthesis and characterization
Thermogravimetry
2,2′-Dithiobis(pyridine-N-oxide)
Pyrolysis
Thermal decomposition
Rare earth metal complex
Nitrone
Preparation
Organic ligand
Picric acid
Experimental study
Degradation product
Adduct
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Summary:Rare earth picrates addition compounds with 2,2′-dithiobis(pyridine-N-oxide) (dithio) were synthesized and characterized. CHN analysis suggest a general formula Ln(pic) 3·1.5dithio·4H 2O (Ln = La, Nd, Eu, Dy, Ho). IR spectra indicate: (a) the presence of water molecules; (b) the presence of picrate in bidentade form; and (c) a bond of dithio to the RE through NO groups. Parameters, calculated from Nd absorption spectra at room temperature are in agreement with a small covalent character of the Ln:L interaction. Thermogravimetric data under N 2 and air atmospheres, show that: (a) the water molecules loss is the first decomposition step (up to 453 K); (b) the residue, at ca. 1173 K, is essentially Ln 2O 3.
ISSN:0040-6031
1872-762X
DOI:10.1016/S0040-6031(99)00328-7