Abstract
Thermogravimetry (TG), differential thermal analysis (DTA) and other analytical methods have been applied to the investigation of the thermal behaviour and structure of the complexes Mg(pc)(na)3⋅3H2O (I), Mg(pc)(py)2⋅2H2O (II),Mg(pc)(pic)2⋅2H2O (III) and Mg(pc)(caf)2⋅4H2O (IV), where pc=2,6- pyridinedicarboxylate, na=nicotinamide,py=pyridine, pic=γ-picoline and caf=caffeine. The thermal decomposition of these compounds is multi-stage processes. The chemical composition of the complexes, the solid intermediates and the resultant products of thermolysis have been identified by means of elemental analysis and complexometric titration. Schemes of destruction of these complexes are suggested. Heating of these compounds first resulted in a release of water molecules. In complexes I, II and IV the loss of the molecular ligands (na, py and caf) occur (on the TG curves) in one step (-2na, -2py and -2caf) and in complex III in two steps (-pic, -pic). The final product of the thermal decomposition was MgO. The thermalstability of the complexes can be ordered in the sequence: IV<I<III<II. Nicotinamide, pyridine, γ-picoline and caffeine were co-ordinated to Mg(II) through the N atom of the respective heterocyclic ring. IR data suggested a unidentate co-ordination of carboxylates to Mg(II) in complexes I–IV.
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D. Hudecová, I. Ondrejkovicová, V. Vancov· and M. MelnÌ k, Chem. Papers, 52 (1998) 123.
E. Jó na, A. Sirota, P. Šimon and M. Kubranová, Thermochim. Acta, 258 (1995) 161.
R. N. Patel and K. B. Pandeya, Synth. React. Inorg. Met.-Org. Chem., 28 (1998) 23.
E. Jó na and M. Jamnický , J. Thermal Anal., 27 (1983)359.
J. S. Skoršepa, K. Györyová and M. Melník, J. Thermal Anal., 44 (1995) 169.
L. Bapat, G. N. Natu, M. Bhide and J. Kher, J. Thermal Anal., 48 (1997) 819.
J. Radwanska-Doczekalska, D. Czakis-Sulikowska and M. Markiewicz, J. Thermal Anal., 48 (1997) 865.
M. Enamullah and W. Linert, J. Coord. Chem., 35 (1995) 325.
G. D'Ascenzo, U. B. Ceipidor, E. Cardarelli and A. D. Magri, Thermochim. Acta, 13 (1975) 449.
R. N. Patel and K. B. Pandeya, J. Inorg. Biochem., 72 (1998) 109.
M. Melník, L. Macášková and J. Mroziński, Polyhedron, 7 (1988) 1745.
M. Melník, I. Potočnak, L. Macášková and D. Mikloš, Polyhedron, 15 (1996) 2159.
M. Melník, M. Koman and T. Glowiak, Polyhedron, 17 (1998) 1767.
E. Jó na, M. Kubranová, P. Šimon and J. Mroziński, J. Thermal Anal., 46 (1996) 1325.
K. Györyová, V. Balek and V. Zeleňak, Thermochim. Acta,234 (1994) 221.
V. Balek, K. Györyová and J. Simon, J. Thermal Anal., 46 (1996) 573.
T. Šramko, G. Liptay and E. Jó na, J. Thermal Anal., 12 (1977) 217.
Y. Masuda, Thermochim. Acta, 39 (1980) 235.
S. C. Mojumdar, M. Melník and E. Jó na, J. Anal. Appl. Pyrolysis,46 (1998) 147.
S. C. Mojumdar, M. Valko and M. Melník, Chem. Papers, 52 (1998)650.
S. C. Mojumdar, M. Melník and E. Jó na, J. Therm. Anal. Cal., 56 (1999) 533.
S. C. Mojumdar, M. Melník and M. Valko, Polish J. Chem., 73 (1999) 457.
S. C. Mojumdar, M. Melník and E. Jó na, J. Anal. Appl. Pyrolysis,48 (1999) 111.
S. C. Mojumdar, M. Melník and E. Jó na, Polish J. Chem., 73 (1999) 293.
S. C. Mojumdar, M. Melník and E. Jó na, J. Therm. Anal. Cal., 56 (1999) 541.
S. C. Mojumdar, M. Melník, E. Jó na and D. Hudecová, Chem. Papers, 53(1999)265.
S. C. Mojumdar, M. Melník and E. Jó na, J. Anal. Appl. Pyrolysis, 53 (2000) 149.
S. C. Mojumdar, E. Jó na and M. Melník,J. Therm. Anal. Cal., 60 (2000) 571.
S. C. Mojumdar, M. Melník and E. Jó na, Thermochim. Acta,352 (2000) 129.
S. C. Mojumdar, M. Melník and E. Jó na, J. Therm. Anal. Cal.,61 (2000) 915.
G. Deveto, G. Ponticelli and C. Preti, J. Inorg. Nucl. Chem.,37 (1975)1635.
M. Melník, Coord. Chem. Rev.,36 (1981)1.
M. Melník, Coord. Chem. Rev.,42 (1982) 259.
K. Nakamoto, Infrared and Raman Spectra of Inorganic and Co-ordination Compounds, (4th ed.), J. Wiley, New York 1986, p.232.
D. Aslanian, A. Lautic, Ch. Mantai and M. Baltanski,J. Chim. Phys., 72 (1957) 1052.
Y. Kidani, M. Noji and H. Koike, Bull. Chem. Soc. Jpn.,48 (1975) 239.
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Mojumdar, S.C. Thermoanalytical and IR-spectral Investigation of Mg(II) Complexes with Heterocyclic Ligands. Journal of Thermal Analysis and Calorimetry 64, 629–636 (2001). https://doi.org/10.1023/A:1011571723133
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DOI: https://doi.org/10.1023/A:1011571723133