Heterospin complexes of bis(μ
2-1,1,2,2,8,8,9,9-octafluorononane-3,5,7-trionato)dicopper(
II) ([Cu
2L
2]) with nitronyl nitroxides 2-(1-methyl-1
H-pyrazol-4-yl)-4,4,5,5-tetramethyl-4,5-dihydro-1
H-imidazole-1-oxyl 3-oxide (
2) and 4,4,5,5-tetramethyl-2-(3-pyridinyl)-4,5-dihydro-1
H-imidazole-1-oxyl 3-oxide (
1) were synthesized and structurally characterized. Crystals of the complexes are formed by the discrete bis[1-methyl-4-(4,4,5,5-tetramethyl-3-oxide-1-oxyl-4,5-dihydro-1
H-imidazol-2-yl)-1
H-pyrazole]-bis (μ
2-1,1,2,2,8,8,9,9-octafluorononane-3,5,7-trionato)dicopper(
II) etherate (
3) and bis[3-(4,4,5,5-tetramethyl-3-oxide-1-oxyl-4,5-dihydro-1
H-imidazol-2-yl)pyridine]-bis (μ
2-1,1,2,2,8,8,9,9-octafluorononane-3,5,7-trionato)dicopper(
II) (
4) molecules. Each Cu atom of the dinuclear chelate fragment coordinates one paramagnetic ligand through the N atom of the
pyrazole or pyridine fragment, respectively. In complex
3, the paramagnetic ligands are located on one side of the plane of the chelate fragment, whereas the ligands in complex
4 are located above and below the plane of the chelate fragment. The magnetic properties of complexes
3 and
4 are determined by dominant antiferromagnetic exchange interactions between the unpaired electrons of the Cu
II atoms in the dinuclear Cu
2L
2 moiety.
Dedicated to Academician O. M. Nefedov on the occasion of his 75th birthday.
Published in Russian in
Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 11, pp. 1836–1840, November, 2006.
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