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3 results on '"Maria Kubiak"'

1. Crystal structure and thermoanalytical study of a cadmium(II) complex with 1-allylimidazole

Author

Stefano Materazzi, Simonetta De Angelis Curtis, Krystyna Kurdziel, Stefano Vecchio, and Maria Kubiak

Subjects
chemistry.chemical_classification, crystal structure, Evolved gas analysis, Chemistry, Kinetics, Analytical chemistry, Oxide, chemistry.chemical_element, coupled tg-ftir, Crystal structure, Manganese, cadmium(ii) complexes, decomposition kinetics, dsc, ega, imidazole derivatives, tg, Analytical Chemistry, Coordination complex, Thermogravimetry, chemistry.chemical_compound, Fuel Technology, Physical chemistry, Molecule
Abstract

The crystal structure of a manganese(II) 1-allylimidazole complex ([Mn(1-AIm)3(NO3)2], where 1-Aim=1-allylimidazole), was characterized by X-ray diffraction (XRD) using SHELX-97. The thermal behaviour of the complex was investigated by thermogravimetry (TG) coupled with an FTIR unit. The complex showed a multi-step decomposition related to the release of the ligand molecules, followed by oxidation. The final residue at 1073 K was found to be manganese(II) oxide. Evolved gas analysis allowed to prove the oxidative decomposition pattern of the examined complex, initially proposed by the percentage mass loss data. Finally, a kinetic analysis of the oxidative decomposition steps was made using the Kissinger equation, while the complex nature of the decomposition kinetics was revealed by the isoconversional Ozawa-Flynn-Wall method.

Published
2010

2. Synthesis and characterization of a novel tetranuclear bimetallic complex containing rhodium(II) and zinc(II) as metal centres

Author

Fioretta Asaro, Maria Kubiak, Giacomo Costa, Giorgio Pellizer, Jésef J. Ziółkowski, Claudio Tavagnacco, Tadeusz Głowiak, Monika Moszner, Maria, Kubiak, Tadeusz, Głowiak, Monika, Moszner, Jésef J., Ziółkowski, Asaro, Fioretta, Giacomo, Costa, Giorgio, Pellizer, Tavagnacco, Claudio, Kubiak, M., Glowiak, T., Moszner, M., Ziolkowski, J., Costa, G., and Pellizer, G.

Subjects
rhodium, zinc, complexes, chemistry.chemical_element, Nuclear magnetic resonance spectroscopy, Zinc, Triclinic crystal system, Rhodium, Inorganic Chemistry, Metal, chemistry.chemical_compound, Crystallography, Dimethylglyoxime, chemistry, visual_art, Materials Chemistry, visual_art.visual_art_medium, Molecule, Physical and Theoretical Chemistry, Bimetallic strip
Abstract

Rh(Hdmg)2(PPh3)Cl (Hdmg=monoanion of dimethylglyoxime) undergoes reduction with zinc amalgam to give the tetranuclear bimetallic compound [Rh(Hdmg)(ClZndmg)(PPh3)]2, characterized by elemental analysis, electronic, IR and NMR spectroscopy and X-ray crystallography. It crystallizes in the triclinic space group P1 with: a=14.262(4), b=14.675(4), c=14.698(4) A, α=82.15(4), β=87.57(4), γ=65.89(3)°, Z=2. The structure was refined up to R=0.13 for 4704 reflections. The molecule consists of two [Rh(dmg)(Hdmg)(PPh3)] subunits linked by an [Rh(II)(II)] bond of length equal to 2.852(3) A and by two Zn ions bridging the oxygens of the equatorial ligands. The binding with zinc relieves the equivalence among the atoms of each subunit.

Published
1995

3. The influence of the intramolecular hydrogen bond on the 1,3-N,S- and 1,5-O,S-coordination of N-phosphoryl-N′-(R)-thioureas with Ni(ii) and Pd(ii).

Author

Felix D. Sokolov, Sergey V. Baranov, Damir A. Safin, F. Ekkehardt Hahn, Maria Kubiak, Tania Pape, Maria G. Babashkina, Nail G. Zabirov, Joanna Galezowska, Henryk Kozlowski, and Rafael A. Cherkasov

Subjects
ATOMS, PHYSICAL & theoretical chemistry, NONMETALS, MOLECULAR structure
Abstract

Reaction of the potassium salts of N-phosphorylated thioureas of common formula R1–N(H)–C(S)–N(H)–P(O)(OiPr)2 (HA) with NiII and PdII cations leads to [MA2] chelate complexes (M = NiII, R1 = p-MeOC6H4, p-BrC6H4, t-Bu, c-Hex; M = PdII, R = iPr). In both the NiII and PdII complexes, the metal center is found in a square-planar N2S2 environment formed by the C=S sulfur atoms and the P–N nitrogen atoms of two deprotonated ligands A−. The PdII atoms in [PdB2] complexes with deprotonated thioureas of common formula R2–C(S)–N(H)–P(O)(OiPr)2 (HB) (R2 = Et2N, morpholine-N-yl) are coordinated in a square-planar fashion by the C=S sulfur atoms and the P=O oxygen atoms of two anionic ligands. Molecular structures of four complexes [M(A-N,S)2] (M = NiII, R1 = p-MeOC6H4, p-BrC6H4, t-Bu; M = PdII, R1 = iPr) and the palladium(ii) 1,5-O,S-chelate of formula [Pd(B-O,S)2] (R2 = morpholine-N-yl) were elucidated by X-ray diffraction. [ABSTRACT FROM AUTHOR]

Published
2007
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