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Copper(II) Pyridine-2,6-dicarboxylates. Coordination and Distortion Isomers of [Cu(pydca)(H2O)2]

Koman M., Moncol J., Hudecová D., Dudová B., Melnik M., Korabik M., Mroziński J.

Polish Journal of Chemistry

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2001

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Vol. 75, nr 7

957-964

EN

Copper(II) pyridine-2,6-dicarboxylate dihydrate and its ronicol (ron), nicotinamide (nia) and caffeine (caf) complexes were prepared and their spectral, magnetic as well as their bio-activites were studied. X-ray analysis of [Cu(pydca)(H2O)2] (pydca = pyridine- 2,6-dicarboxylate) shows, that the complex exists in two isomeric forms: monoclinic and triclinic and it is an example of the coordination isomerism. Triclinic forms also exists in two isomeric forms, differing mostly by degree of distortion and being an example of the distortion isomerism. On the basis of spectral and magnetic properties for Cu(pydca)L (L = ron, nia or caf) a square-pyramidal coordination of the copper(II) ion can be proposed. Highest bio-activity shows [Cu(pydca)(H2O)2].

2

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

Mojumdar S., Melnik M., Jóna E.

Polish Journal of Chemistry

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1999

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vol. 73 nr 2

293-297

EN

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.

3

Spectral and thermal properties of copper(II) complexes with methyl-3-pyridyl carbamate

Mojumdar S., Melnik M., Valko M.

Polish Journal of Chemistry

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1999

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vol. 73 nr 3

457-463

EN

Thermogravimetry (TG), differential thermal analysis (DTA), infrared (IR), electronic, EPR spectra and other analytical methods have been applied to the investigation of the thermal behaviour and structure of the compounds [Cu(ac)2(mpc)]2×2CH3OH (I), Cu(Clac02(mpc) (II), Cu(Cl2ac)2(mpc)2 (III) and Cu(Cl3ac)2(mpc)2 (IV) (where ac = CHCOO-, Clac = ClCH2COO-, Cl2ac = Cl2CHCOO-, Cl3ac = Cl3CCOO- and mpc = methyl-3-pyridyl carbamate). The solid phase intermediate and resultant products of thermolysis had been identified. The possible scheme of decomposition of the complexes is suggested with as a final product, CuO. IR data suggest a unidentate coordination of carboxylate to copper(II). Methyl-3-pyridyl carbamate was coordinated through nitrogen atom of its heterocyclic ring in complexes I-IV. EPR spectra suggest a diametric structure of complex I and manometric structure of complexes II-IV.

4

Preparation, spectral properties and antimicrobial effects of new Cu(II) compounds with some bio-active ligands

Mojumdar S., Hudecova D., Melnik M.

Polish Journal of Chemistry

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1999

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vol. 73 nr 5

759-764

EN

The compounds [Cu(ac)2(Et2na)]2 × Et2na × 2H20 (I), Cu(Clac)2(Et2na)3 (II), Cu(Cl2ac)2(Et2na)2 × 2H20 (III), [Cu(ac)2mpc]2 × 2CH3OH (IV), Cu(Clac)2(mpc) (V), Cu(Cl2ac)2(mpc)2 (VI), Cu(Cl3ac)2(mpc)2 (VII), Cu(pc) × 5h2O (VIII), where ac=CH3Coo-, Clac=ClCH2COO-, Cl2ac=Cl2CHCOO-, Cl3ac=Cl3CCOO-, Et2na=N,N-diethylnicotinamide, mpc= methyl-3-pyridyl carbamate and pc=2,6-pyridinedicarboxylate have been prepared and characterized by elemental analysis, IR, EPR and electronic spectra. Their antimicrobial effects have been tested on various fungal strains. Significant morphological changes of Botrytic cinerea were observed by the compounds V and VII. The highest antimicrobial effects were manifested by compound IV. IC50 and MIC of that compound are 220 and 1000 mg/ml against Rhizopus oryzae, 250 and 500 mg/ml against Microsporum gypseum, respectively. IR data suggest a unidentate coordination of carboxylate to Cu(II). Et2na and mpc were coordinated through the N atom of the heterocyclic rings. EPR spectra suggest a diametric structure of complexes I and IV and monomeric structure of complexes II, III, V-VIII.

5

Crystal Structure, Spectral and Thermal properties of tetrakis(acetato) Bis(methyl-3-pyridyl carbamate) Dicopper(II) Di(methanol)

Melnik M., Mojumdar S., Koman M.

Polish Journal of Chemistry

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1999

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Vol. 73, nr 8

1293-1299

EN

The ctrystal and molecular structure of the tetrakis(acetato) bis(methyl-3-pyridyl carbamate) dicopper(II) di(methanol) was determined by direct method and Fourier techniques. The compound crystallizes in the triclinic system. The structure was refined by full-matrix least-squares methods to a weighted R factor of 0.0590, based on independent reflections.