Factors affecting the magnetic properties of dimeric copper(II) complexes

Magnetic exchange in polynuclear metal complexes

N,N'-ethylenebis(salicylideneiminato) transition metal ion chelates

Transition metal complexes with binucleating ligands

Antitumour copper(II) salicylaldehyde benzoylhydrazone (H2sb) complexes: physicochemical properties and the single-crystal X-ray structures of [{Cu(H2sb)(CCl3CO2)2}2] and [{Cu(Hsb) (ClO4) (C2H5OH)}2] and the related salicylaldehyde acetylhydrazone (H2sa) complex, [Cu(Hsa)Cl(H2O)]·h2O

The reaction of cupric acetate with the reaction mixture of γ-aminopropyl alcohol and substituted salicylaldehydes in ethanol gave dimeric copper(II) complexes. The postulated structure of these complexes makes it possible to test the substituent effect transmitted to the coordinating atoms which are not in the superexchange pathway between copper-(II) ions in a pair. The magnetic moments observed at room temperature were corrected for the temperature variations to those at 25°C by graphic method based on Bleaney and Bowers’ equation. The observed substituent effect on the relation between μeff25°C and λmax is different from that observed for dimeric cupric halides complexes of substituted pyridine N-oxides. In these complexes the substituent effect transmits to the bridging oxygen atom in the superexchange pathway. As compared with the parent complex (H), methyl, chloro and benzo groups weakened the magnetic interaction but nitro group strengthened it. An interpretation of the substituent effect is given...

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Magnetic Moments and d–d Bands of N-n-Propanolsalicylaldiminato-copper(II)

Magnetic and spectral studies on copper(II) complexes with N-hydroxyalkylsalicylideneimines

Magnetic and spectral studies on copper(II) halide complexes with N-ethanolsalicylideneimines

Complexes with the formula, Cu(\overset1O·C6H4·\overset2CH=N–Ph–X)Cl, where Ph-X is a mono- or disubstituted phenyl group, were prepared. A dimeric structure was postulated for these complexes based on the observed subnormal magnetic moments and the chemical formula. For these complexes, a linear relation was observed to exist between the magnetic moments, μeff25°C, and the d–d band positions, \ ildenumax. The d–d bands of the dimeric complexes with o-substituents appeared at shorter wavelengths than those with m- or p-substituents irrespective of the polar nature of the substituents. A similar ortho-effect was also observed for the magnetic moments; complexes with o-substituents were observed to have smaller moment values than those with m- or p-substituents. The oryho-effect was also observed in the d–d bands of the monomeric bis-complexes Cu(\overset1O·C6H4·\overset2CH=N–Ph–X)2 and their d–d bands when X=o-substituents appeared at shorter wavelengths than those with m- or p-substituents. These ortho-ef...

Shielding Effect of Ortho-Substituents on Magnetic Moments and d-d Bands in Chloro-N-phenylsalicylideneiminatocopper(II)

We have prepared a variety of binuclear and trinuclear complexes of the composition Cu-(TDSB)·MX2 and 2Cu(TDSB)·M(ClO4)2, where Cu(TDSB)=N,N′-ethylenebis(salicylideneiminato)copper(II) or N,N′-1,2-propylenebis(salicylideneiminato)copper(II), and M=Co, Ni, Cu and Zn. A few higher polynuclear species were also prepared. The previously reported empirical rule found in binuclear copper(II) complexes, where the two copper ions are in the same environment, that the “higher energies of d-d bands - lower magnetic moments,” was proved to hold in the binuclear copper complexes of the present study, even though the two copper ions are in different environments. For a series of complexes with M = Cu or other metals, and with X = NO3 or ClO4, it was observed that “d-d bands of Cu(TDSB) apperas at the shortest wavelengths when M = Cu.” For perchlorate complexes, the energy of the d-d band is in the order, Co Zn, the same as the Irving and Williams’ order of complex stability. It can then be generalized that in a ...

Spectral and Magnetic Studies on Bi- and Tri-Nuclear Complexes Derived from Copper(II) Complexes with Tetradentate Schiff Base and One of the Chlorides, Nitrates and Perchlorates of Copper(II), Nickel(II), Cobalt(II) and Zinc(II)

Kyoko Imai

Papers

Magnetic Moments and d–d Bands of N-n-Propanolsalicylaldiminato-copper(II)

Magnetic and spectral studies on copper(II) complexes with N-hydroxyalkylsalicylideneimines

Magnetic and spectral studies on copper(II) halide complexes with N-ethanolsalicylideneimines

Shielding Effect of Ortho-Substituents on Magnetic Moments and d-d Bands in Chloro-N-phenylsalicylideneiminatocopper(II)

Spectral and Magnetic Studies on Bi- and Tri-Nuclear Complexes Derived from Copper(II) Complexes with Tetradentate Schiff Base and One of the Chlorides, Nitrates and Perchlorates of Copper(II), Nickel(II), Cobalt(II) and Zinc(II)