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- Author or Editor: W. Surga x
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Thermal properties of Ca(II) and Cd(II) complexes of pyridinedicarboxylates
Correlation with crystal structures
Abstract
The thermal behavior of [Ca(H2O)3(2,3-pydcH)2] n (I), [Cd(H2O)3(2,3-pydc)] n (II), and [Cd(H2O)6][Cd(2,3-pydcH)3]2 (III) complexes with pyridine-2,3-dicarboxylic acid was monitored by TG, DTG, and DSC analysis, where 2,3-pydcH—mono deprotonated pyridine-2,3-dicarboxylic acid and 2,3-pydc—doubly deprotonated dicarboxylate anion. Thermal decomposition of these compounds go through one or two dehydratation stages, followed by the loss of organic matter. The final decomposition products are found to be the corresponding metal oxides. The possible scheme of destruction of the complexes have been used to reveal the relationships between stability and molecular structure.
The dehydration process of the fibrillar potassium, rubidium and cesium isopolytrimolybdates was investigated by thermogravimetry and X-ray diffractometry. The dehydration took place in one step and the trimolybdates of general formula X2Mo3O10 (whereX=K, Rb or Cs) were obtained.
Abstract
Complexes of 2-mercapto-1-methylimidazole (TMZ) with PdII and PtII of the general formula M(TMZ)nX2 (whereM=Pd, Pt andX=Cl, Br, I or SO4 andn=2 or 4) were obtained. The thermal stabilities of the compounds were estimated by derivatographic measurements and lattice constants were estimated from their X-ray powder diffraction patterns.
Abstract
Carbonaceous films containing Pd nanocrystals can be applied as active layers in gas sensor applications. In this article we show results of studies of C-Pd films, obtained with two different methods: (1) physical and (2) physical + chemical deposition. First type of film prepared by physical vapor deposition (PVD) process was composed of fullerenes, amorphous carbon, and palladium nanograins. In the second method PVD film was modified in chemical vapor deposition (CVD) process forming a foam-like structure. Both types of films were studied by SEM, TEM, TGA, and electrical characterization (measurement of resistivity versus composition of gaseous hydrocarbons mixture).
