NDLI: Manganese(II), cobalt(II), nickel(II), copper(II) and zinc(II) complexes with 4-oxo-4H-1-benzopyran-3-carboxaldehyde : Thermal, spectroscopic and magnetic characterization

Content Provider	Springer Nature Link
Author	Dziewulska Kułaczkowska, Agnieszka
Copyright Year	2009
Abstract	The complexes Mn(II), Co(II), Ni(II) and Zn(II) with 4-oxo-4H-1-benzopyran-3-carboxaldehyde were synthesized and characterized by elemental analysis, infrared and UV spectroscopy, X-ray diffraction patterns, magnetic susceptibility, thermal gravimetric analysis, conductivity and also solubility measurements in water, methanol and DMF solution at 298 K. They are polycrystalline compounds with various formula and different ratio of metal ion:ligand. Their formula are following: [MnL$_{2}$(H$_{2}$O)](NO$_{3}$)$_{2}$·2H$_{2}$O, [CoL$_{2}$](NO$_{3}$)$_{2}$·3H$_{2}$O, [NiL$_{2}$](NO$_{3}$)$_{2}$·3H$_{2}$O, [CuL$_{2}$](NO$_{3}$)$_{2}$·H$_{2}$O and [ZnL$_{3}$](NO$_{3}$)$_{2}$, where L = C$_{10}$H$_{6}$O$_{3}$. The coordination of metal ions is through oxygen atoms present in 4-position of γ-pyrone ring and of aldehyde group of ligand. Chelates of Mn(II), Co(II), Ni(II) and Cu(II) obey Curie–Weiss law and they are high-spin complexes with the weak ligand fields. The thermal stability of analyzed complexes was studied in air at 293–1,173 K. On the basis of the thermoanalytical curves, it appears that thermal stability of anhydrous analysed chelates changed following: Cu (423 K) < Zn (438 K) ~ Co (440 K) < Ni (468 K). The gaseous products of thermal decomposition of those compounds in air atmosphere are following: CO$_{2}$, CO, NO$_{2}$, N$_{2}$O, hydrocarbons and in case of hydrates also water. The molar conductance data confirm that the all studied complexes are 1:2 electrolytes in DMF solution.
Starting Page	1019
Ending Page	1026
Page Count	8
File Format	PDF
ISSN	13886150
Journal	Journal of thermal analysis
Volume Number	101
Issue Number	3
e-ISSN	15728943
Language	English
Publisher	Springer Netherlands
Publisher Date	2009-12-02
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Complexes of Mn(II), Co(II), Ni(II), Cu(II), Zn(II) Chromone Thermal stability FTIR spectra Magnetic susceptibility Measurement Science and Instrumentation Inorganic Chemistry Polymer Sciences Analytical Chemistry Physical Chemistry
Content Type	Text
Resource Type	Article
Subject	Physical and Theoretical Chemistry Condensed Matter Physics

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