Article

Journal of Thermal Analysis and Calorimetry

, Volume 104, Issue 3, pp 817-821

Thermal properties of solid complexes with biologically important heterocyclic ligands

Part III. Thermal decomposition and infrared spectra of thiocyanato Mg(II) complexes with 2-hydroxypyridine, quinoline, and quinoxaline
  • E. JónaAffiliated withDepartment of Chemical Technologies and Environment, Faculty of Industrial Technologies, Trencin University of A. Dubcek
  • , L’. LajdováAffiliated withDepartment of Chemical Technologies and Environment, Faculty of Industrial Technologies, Trencin University of A. Dubcek
  • , L’. KvasnicováAffiliated withDepartment of Chemical Technologies and Environment, Faculty of Industrial Technologies, Trencin University of A. Dubcek
  • , S. LendvayováAffiliated withDepartment of Chemical Technologies and Environment, Faculty of Industrial Technologies, Trencin University of A. Dubcek
  • , M. PajtášováAffiliated withDepartment of Chemical Technologies and Environment, Faculty of Industrial Technologies, Trencin University of A. Dubcek
  • , D. OndrušováAffiliated withDepartment of Chemical Technologies and Environment, Faculty of Industrial Technologies, Trencin University of A. Dubcek
  • , P. LizákAffiliated withDepartment of Industrial Design, Faculty of Industrial Technologies, Trencin University of A. Dubcek
  • , S. C. MojumdarAffiliated withDepartment of Chemical Technologies and Environment, Faculty of Industrial Technologies, Trencin University of A. DubcekUniversity of New BrunswickDeptartment of Chemical and Biochemical Engineering, The University of Western Ontario Email author 

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Abstract

The thermal decomposition of the complexes Mg(SCN)2(2-OHpy)4·H2O(I), Mg(SCN)2(quin)4·2H2O(II) and Mg(SCN)(quinox)4·5H2O(III) (2-OHpy–2-hydroxypyridine, quin–quinoline, quinox–quinoxaline) has been investigated in static air atmosphere at 20–1000 °C by means of thermogravimetry (TG), differential thermal analysis (DTA), and infrared (IR) spectroscopy. The composition of the complexes had been identified by means of elemental analysis and complexometric titration. The possible scheme of destruction of the complexes is suggested. The final product of the thermal decomposition was MgS. IR data suggest that heterocyclic ligands were coordinated to Mg(II) through the nitrogen atom of their heterocyclic ring. Thiocyanate group is also coordinated through the nitrogen atom.

Keywords

Thermal decomposition Mg(II) complexes 2-hydroxypyridine Quinoline Quinoxaline TG DTA IR