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

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• 作者：Christos Papadopoulos ; Beata Cristóvão…
• 关键词：TG/DTG–DTA ; Cobalt(II) complexes ; Salicylaldehydes ; Dipyridylamine ; Crystal structure ; Magnetics ; TG–MS ; Vyazovkin’s advanced isoconversional method
• 刊名：Journal of Thermal Analysis and Calorimetry
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：123
• 期：1
• 页码：717-729
• 全文大小：1,162 KB
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• 作者单位：Christos Papadopoulos (1)
  Beata Cristóvão (2)
  Wieslawa Ferenc (2)
  Antonios Hatzidimitriou (1)
  Stefano Vecchio Ciprioti (3)
  Roberta Risoluti (4)
  Maria Lalia-Kantouri (1)
  
  1. Laboratory of Inorganic Chemistry, Department of Chemistry, Aristotle University of Thessaloniki, 54 124, Thessaloniki, Greece
  2. Department of General and Coordination Chemistry, Faculty of Chemistry, Maria Curie-Skłodowska University, Sq. Maria Curie- Skłodowska 2, 20-031, Lublin, Poland
  3. Department of Basic and Applied Science for Engineering, Sapienza University of Rome, Via del Castro Laurenziano 7, 00161, Rome, Italy
  4. Department of Chemistry, Sapienza University of Rome, P.le A. Moro 5, 00185, Rome, Italy
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Sciences
  Polymer Sciences
  Physical Chemistry
  Inorganic Chemistry
  Measurement Science and Instrumentation
  
• 出版者：Akad茅miai Kiad贸, co-published with Springer Science+Business Media B.V., Formerly Kluwer Academic
• ISSN：1572-8943

文摘

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 °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.