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1
Sythesis and characterization of novel copper (II) complexes of dehydroacetic acid thiosemicarrbazone
El-Tabl A., Kashar T., El-Bahnasawy R., El-Monsef Ibrahim A.
Polish Journal of Chemistry
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1999
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vol. 73 nr 2
245-254
EN
Dehydroacetic acid thiosemicarbazone and its copper(II) complexes have been synthesized and characterized by elemental analyses, IR, VIS-UV, magnetic susceptibility, conductivity, DTA and ESR spectra. Molar conductance indicates that the complexes are non-electrolytes except for [Cu(H2L)]SO4×2H20. The ESR spectra of the complexes show axial type symmetry with gII>g1>2.00, indicating dx2-y2 ground state with significant covalent bond character.
2
Preparation and Thermophysical Properties of New Cobalt(II), Nickel(II) and Copper(II) Complexes
El-Tabl A., Abou-Sekkina M.
Polish Journal of Chemistry
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1999
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Vol. 73, nr 12
1937-1945
EN
The nickel(II) complex reacted with excess of ethylenediamine to yield a new type of macrocyclic complex. These compounds have been characterized by elemental analysis, IR, UV-Vis spectra, molar conductances, magnetic moment, mass fragmentation spectra, thermal analyses and ESR measurements.
3
Mononuclear and Binuclear Copper(II) Complexes of Phenylhydrazoacetylacetone Isonicotinoylhydrazone
El-Bahnasawy R., El-Tabl A., El-Shereafy E., Kashar T., Issa Y.
Polish Journal of Chemistry
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1999
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Vol. 73, nr 12
1925-1935
EN
Copper(II) complexes of phenylhydrazoacetylacetone isonicotinoylhydrazone (PHAH) have been prepared and characterized by elemental and thermal analyses, conductance, magnetic moment, IR and UV-VIS spectra. The conductances indicate that the complexes are nonelectrolytes. In neutral solutions, mononuclear complexes have been obtained, however, in the presence of ammonia, the mononuclear comlex and binuclear complexes have been isolated.
4
ESR studies on copper(II) complexes of 1,3-diaminopropane and 1,2-diaminopropane
Ayad M., El-Tabl A.
Polish Journal of Chemistry
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1999
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vol. 73 nr 2
263-269
EN
The synthesis and characterization of (NH2RNH2)3CuCl2×H20 complexes, where R=(-CH2-)3 or (-CH(CH3)-CH2-) are reported. The complexes are octahedral. The ESR spectra of polycrystalline samples showed broad lines, which indicate spin-exchange interactions between copper(II) ions. In solution at 77K, the spectra show axial type symmetry with dx2-y2 ground state of a tetragonal distortion around copper(II) ion. The bonding parameters a22 and b21 indicate a covalent character of in-plane s and p bondings, while b2 indicates ionic out-of-plane p bondings. d-Orbital populations of the complexes indicate, that the unpaired electron site is mainly in dx2-y2 orbital.
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