Cobalt(II) complexes of 2,2'-dipyridylamine (dpamH) and substituted salicylaldehyde ligands (X-saloH, where X = 5-NO2, CH3, Br and Cl) with the general formula [Co(X-salo)(2)(dpamH)] (1-4), were synthesized and characterized by physicochemical methods and by spectroscopy (IR and UV-Vis). The octahedral geometry around Co2+ ion and the bidentate chelating mode of the anion X-salo(-) were proved by single-crystal X-ray diffraction analysis for the complexes [Co(5-CH3-salo)(2)(dpamH)] (2) and [Co(5-Cl-salo)(2)(dpamH)] (4). The variable-temperature (76-303 K) magnetic susceptibility measurements showed a paramagnetic nature of the complexes, in accordance with their molecular structure. The simultaneous TG/DTG-DTA technique was used to analyze their thermal behavior under inert atmosphere, with particular attention to determine their thermal degradation pathways, which was found to have a multi-step nature, accompanied by the release of the ligand molecules, as it is partially confirmed by analyzing the amount of gases evolved during heating under experimental conditions comparable with those of TG by using a TG-MS device. Finally, the decomposition kinetics, analyzed by applying the Vyazovkin's advanced isoconversional method and referred to the elimination of the ligand molecules in the range 200-400 A degrees C (process that was found to be common in all four complexes), confirmed the stability order assessed on the basis of the decomposition temperatures only.

Thermoanalytical, magnetic and structural investigation of neutral Co(II) complexes with 2,2′-dipyridylamine and salicylaldehydes / Papadopoulos, Christos; Cristóvão, Beata; Ferenc, Wieslawa; Hatzidimitriou, Antonios; VECCHIO CIPRIOTI, Stefano; Risoluti, Roberta; Lalia Kantouri, Maria. - In: JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY. - ISSN 1388-6150. - STAMPA. - 123:1(2016), pp. 717-729. [10.1007/s10973-015-4976-3]

Thermoanalytical, magnetic and structural investigation of neutral Co(II) complexes with 2,2′-dipyridylamine and salicylaldehydes

VECCHIO CIPRIOTI, Stefano;RISOLUTI, ROBERTA;
2016

Abstract

Cobalt(II) complexes of 2,2'-dipyridylamine (dpamH) and substituted salicylaldehyde ligands (X-saloH, where X = 5-NO2, CH3, Br and Cl) with the general formula [Co(X-salo)(2)(dpamH)] (1-4), were synthesized and characterized by physicochemical methods and by spectroscopy (IR and UV-Vis). The octahedral geometry around Co2+ ion and the bidentate chelating mode of the anion X-salo(-) were proved by single-crystal X-ray diffraction analysis for the complexes [Co(5-CH3-salo)(2)(dpamH)] (2) and [Co(5-Cl-salo)(2)(dpamH)] (4). The variable-temperature (76-303 K) magnetic susceptibility measurements showed a paramagnetic nature of the complexes, in accordance with their molecular structure. The simultaneous TG/DTG-DTA technique was used to analyze their thermal behavior under inert atmosphere, with particular attention to determine their thermal degradation pathways, which was found to have a multi-step nature, accompanied by the release of the ligand molecules, as it is partially confirmed by analyzing the amount of gases evolved during heating under experimental conditions comparable with those of TG by using a TG-MS device. Finally, the decomposition kinetics, analyzed by applying the Vyazovkin's advanced isoconversional method and referred to the elimination of the ligand molecules in the range 200-400 A degrees C (process that was found to be common in all four complexes), confirmed the stability order assessed on the basis of the decomposition temperatures only.
2016
Cobalt(II) complexes; Crystal structure; Dipyridylamine; Magnetics; Salicylaldehydes; TG-MS; TG/DTG-DTA; Vyazovkin's advanced isoconversional method; Physical and Theoretical Chemistry; Condensed Matter Physics
01 Pubblicazione su rivista::01a Articolo in rivista
Thermoanalytical, magnetic and structural investigation of neutral Co(II) complexes with 2,2′-dipyridylamine and salicylaldehydes / Papadopoulos, Christos; Cristóvão, Beata; Ferenc, Wieslawa; Hatzidimitriou, Antonios; VECCHIO CIPRIOTI, Stefano; Risoluti, Roberta; Lalia Kantouri, Maria. - In: JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY. - ISSN 1388-6150. - STAMPA. - 123:1(2016), pp. 717-729. [10.1007/s10973-015-4976-3]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/856241
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