A compound of formula CuCI2(NITpPy),, where NITpPy = 2-(4-pyridyl)-4,4,5,5-tetramethylimidazolinyIl--o xy1 3-oxide, was synthesized. It crystallizes in the triclinic Pi space group with a = 7.301 ( I ) A, b = 12.693 (2) A, c = 14.984 (2) A, a! = 79.79 (I)', 0 = 86.67 (I)', y = 83.92 (I)', and Z = 2. The structure consists of dinuclear [ C U C I ~ ( N I T ~ cPe~nt)ro~s]ym~m etric units. The copper atoms are square-pyramidally coordinated by two nitrogen atoms of the pyridine rings and three chlorine atoms, two of them bridging the copper ions. The N-0 groups of the radicals belonging to different mononuclear units are at a relatively short separation distance. The analysis of the magnetic susceptibility measurements and of the single-crystal EPR spectra at room and liquid-helium temperatures suggests that the six S = spins are antiferromagnetically coupled and that the interaction between copper and radical through the nitrogen of the pyridine ring dominates. The interaction between radicals is also significantly different from zero, and structural-magnetic correlations, based on the overlap of the magnetic orbitals, were attempted.
Crystal structure and magnetic properties of a copper(II) chloride nitronyl nitroxide complex containing six exchange-coupled S = 1/2 spins / Andrea Caneschi;Fabrizio Ferraro;Dante Gatteschi;Paul Rey;Roberta Sessoli. - In: INORGANIC CHEMISTRY. - ISSN 0020-1669. - STAMPA. - 29:(1990), pp. 1756-1760. [10.1021/ic00334a032]
Crystal structure and magnetic properties of a copper(II) chloride nitronyl nitroxide complex containing six exchange-coupled S = 1/2 spins
CANESCHI, ANDREA;GATTESCHI, DANTE;SESSOLI, ROBERTA
1990
Abstract
A compound of formula CuCI2(NITpPy),, where NITpPy = 2-(4-pyridyl)-4,4,5,5-tetramethylimidazolinyIl--o xy1 3-oxide, was synthesized. It crystallizes in the triclinic Pi space group with a = 7.301 ( I ) A, b = 12.693 (2) A, c = 14.984 (2) A, a! = 79.79 (I)', 0 = 86.67 (I)', y = 83.92 (I)', and Z = 2. The structure consists of dinuclear [ C U C I ~ ( N I T ~ cPe~nt)ro~s]ym~m etric units. The copper atoms are square-pyramidally coordinated by two nitrogen atoms of the pyridine rings and three chlorine atoms, two of them bridging the copper ions. The N-0 groups of the radicals belonging to different mononuclear units are at a relatively short separation distance. The analysis of the magnetic susceptibility measurements and of the single-crystal EPR spectra at room and liquid-helium temperatures suggests that the six S = spins are antiferromagnetically coupled and that the interaction between copper and radical through the nitrogen of the pyridine ring dominates. The interaction between radicals is also significantly different from zero, and structural-magnetic correlations, based on the overlap of the magnetic orbitals, were attempted.File | Dimensione | Formato | |
---|---|---|---|
ic00334a032.pdf
Accesso chiuso
Tipologia:
Versione finale referata (Postprint, Accepted manuscript)
Licenza:
Tutti i diritti riservati
Dimensione
611.73 kB
Formato
Adobe PDF
|
611.73 kB | Adobe PDF | Richiedi una copia |
I documenti in FLORE sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.