ISSN:
1434-1948
Keywords:
Bridging ligands
;
Nitrito bridge
;
Copper
;
Nickel
;
Magnetic properties
;
Supramolecular chemistry
;
Chemistry
;
General Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
The reaction of NiX2 · 6 H2O (X = NO3-, ClO4-), bidentate amine, [Cu(oxpn)] [oxpn = N,N′-bis(3-aminopropyl)oxamide] and sodium nitrite in ethanolic solution, leads to the formation of new Cu2+-Ni2+ complexes of general formula [Cu(oxpn)Ni(NO2)(aa)]n(X)n [1, X = ClO4-, aa = N,N,N′-trimethylethylenediamine (trimen); 2, X = ClO4-, aa = N,N,N′N′- tetramethylethylenediamine (tmen); 3, X = ClO4-, aa = N,N-dimethyl-N′-ethylethylenediamine (dmeten); 4, X = PF6-, aa = trimen; 5, X = PF6-, aa = dmeten]. The structure of complex 1 consists of [Cu(oxpn)Ni(trimen)]2+ units linked by a nitrite group acting as a tridentate ligand, giving a one-dimensional system separated by ClO4- anions. In contrast, the structure of complex 2 consists of isolated [Cu(oxpn)Ni(NO2)(tmen)]+ dinuclear units and uncoordinated ClO4- anions. The nitrite group acts as a bidentate ligand. Variable-temperature magnetic susceptibility studies were performed on 1-5. The J value through the oxamidato bridge is close to -110 cm-1 in all five cases. For complex 1, considered as a chain, a simulation of the χMT vs T was performed with the CLUMAG program. These calculations revealed the influence of the magnetic interactions between the dinuclear entities through the nitrito bridging ligand, on the susceptibility curves at low temperatures.
Additional Material:
8 Ill.
Type of Medium:
Electronic Resource
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