Wyniki wyszukiwania - BazTech

Ograniczanie wyników

2 Polish Journal of Chemistry

Znaleziono wyników: 2

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: heteronuclear complexes

Sortuj według:

Ogranicz wyniki do:

Synthesis and Properties of New Bimetallic Complexes of General Formula: [Cu(diamine)2][Cr(NCS)4(NH3)2]2

Wrzeszcz G., Grzebielucha T.

Polish Journal of Chemistry

2009

Vol. 83, nr 9

1575-1582

Four new thiocyanato bridged heteronuclear com plexes of general formula [Cu(diamine)2][Cr(NCS)4(NH3)2]2, where diamine = ethylenediamine (en) (1), 1,2-di -amino propane (pn) (2), 1,3-diaminopropane (tn) (3) and N-methylethylenediamine (men) (4) have been prepared in solid state by treatment of [Cr(NCS)4(NH3)2]– with corresponding cationic [Cu(diamine)2]2+ complex in anaqueous solutions. They have been characterized by elemental and thermal analysis, spectroscopic methods (IR, UV-Vis, EPR), and variable-temperature magnetic susceptibility measurements. The formation of end-to-end thiocyanato bridges between tetragonal (elongated octahedral) Cu(II) and octahedral Cr(III) is evident from IR and electronic spectra. The EPR spectra measured at room temperature on solid samples (1 and 3) show very broad and symmetric signal at g = 2.02 and 2.07, respectively. Magnetic data reveal the absence of significant exchange inter actions between the Cr(III) and Cu(II) ions in all studied complexes (1–4). Thermal decomposition after ammonia release is multistage and yields CuO, and Cr2O3 as final products.

Synthesis and Characterization of Thiocyanato-Bridged Heteropolynuclear Chromium(III)-Copper(II) Complexes

Dobrzańska L., Wrzeszcz G., Grodzicki A., Rozpłoch F.

Polish Journal of Chemistry

2000

Vol. 74, nr 2

199-206

Heteropolynuclear thiocyanate-bridged complexes were prepared in the reactions of aqueous solutions of K3[Cr(NCS)6] with copper(II) complexes of the type [CuX4]2+, where X=imidazole (imH), 4-methylimidazole (4-MeimH) and 2X= ethylenediamine (en). Solid products were formulated as (Cu(imH)4)3(Cr(NCS)6)2 *2H2O, (Cu(4-MeimH)4)3(Cr(NCS)6)2 *3H2O and (Cu(en)2)3(Cr(NCS)6)2 *2H2O on the basis of elemental analysis and spectral data (IR,UV-VIS). EPR spectra, variable temperature magnetic susceptibility and thermal properties in air were investigated, indicating that all complexes are polynuclear with thiocyanate bridges, exhibiting Curie-Weiss behavior between 80-300 K. Thermal decomposition is multistage and yields CuO and CuCrO2 as final products.