Wyniki wyszukiwania - BazTech

Ograniczanie wyników

2 Polish Journal of Chemistry

Znaleziono wyników: 2

Liczba wyników na stronie

Wyniki wyszukiwania

Sortuj według:

Ogranicz wyniki do:

Thermochemical and Spectral properties of Hydrates of Co(II), Ni(II) and Cu(II) Maleate. Crystal Structure of Co(II) Maleate Trihydrate

Pajtasova M., Jóna E., Koman M., Ondrušová D.

Polish Journal of Chemistry

2001

Vol. 75, nr 9

1209-1217

The crystal and molecular structure of Co(II) maleate trihydrate, Co(C4H2O4)_3H2O, was determined by direct method and Fourier techniques. The structure was refined by full-matrix least-squares methods to a weighted R factor of 0.0263, based on independent reflections. The compound is a three-dimensional coordination polymer with distorted octahedron geometry at each cobalt(II) centre. Each cobalt atom is six-coordinated through two oxygen atoms from water molecules and four oxygen atoms from four different maleate groups. The thermal decompositions of Co(mal)_3H2O, Ni(mal)_3H2O and Cu(mal)_H2O(mal = maleate) have been investigated by means of TG, DTG, DSC and IR spectra. The release of volatile molecules after heating is either a three-step process for Co(mal)_3H2O and Ni(mal)_3H2O or a two-step process for Cu(mal)_H2O.

Thermal decomposition and IR-spectra of Mg(II) Complexes with G-picoline

Mojumdar S., Melnik M., Jóna E.

Polish Journal of Chemistry

1999

vol. 73 nr 2

293-297

The thermal decomposition of the complexes Mg(Clac)2(pic)2×3H20 (I), Mg(Cl2ac)2(pic) × 4H20 (II) and Mg(Cl3ac)2(pic)2 × 3H2O (III), where Clac = ClCH2COO-, Cl2ac = Cl2CHCOO-, Cl3ac = Cl3CCOO- and pic = g-picoline had been investigated in air by TG and DTA. The possible scheme of destruction of the complexes is suggested. The final product was MgO for the complex I-III. The thermal stability of the complexes can be ordered in the sequence: I = III < II. IR data suggest a unidentate coordination of carboxylates to Mg (II) in complexes I-III and g-picoline coordination with Mg(II) through the nitrogen atom of its heterocyclic ring.