Gd(hfac),NITiPr (hfac = hexafluoroacetylacetonate;N ITiPr = 2-isopropyl-4,4,5,5-tetramethyl-4,5-dihy1rH o--i midazolyl-l- oxy1 3-oxide) crystallizes in the monoclinic space group P 2 , / n with cell parameters a = 11.916 (1) A, b = 17.625 ( 9 ) A, c = 18.055 ( I ) A, j3 = 96.98 (I)’, V = 3763.82 A’, and Z = 4. The structure refinement converged to R = 0.086. The molecular structure of the complex consists of linear chains made up by gadolinium(II1) ions bridged by nitronyl nitroxide radicals. The magnetic properties of this compound and of other structurally strictly related lanthanide nitronyl nitroxide complexes are discussed according to a model in which the next-nearest-neighbor interactions are explicitly taken into account. For appropriate values of the exchange parameters the ground state corresponds to a two-spins-up, two-spins-down configuration, which justifies the low effective magnetic moment observed at low temperature
Linear-chain gadolinium(III) nitronyl nitroxide complexes with dominant next-nearest-neighbor magnetic interactions / Benelli, Cristiano; Caneschi, Andrea; Gatteschi, Dante; Luca, Pardi; Paul, Rey. - In: INORGANIC CHEMISTRY. - ISSN 0020-1669. - STAMPA. - 29:(1990), pp. 4223-4228. [10.1021/ic00346a013]
Linear-chain gadolinium(III) nitronyl nitroxide complexes with dominant next-nearest-neighbor magnetic interactions
BENELLI, CRISTIANO;CANESCHI, ANDREA;GATTESCHI, DANTE;
1990
Abstract
Gd(hfac),NITiPr (hfac = hexafluoroacetylacetonate;N ITiPr = 2-isopropyl-4,4,5,5-tetramethyl-4,5-dihy1rH o--i midazolyl-l- oxy1 3-oxide) crystallizes in the monoclinic space group P 2 , / n with cell parameters a = 11.916 (1) A, b = 17.625 ( 9 ) A, c = 18.055 ( I ) A, j3 = 96.98 (I)’, V = 3763.82 A’, and Z = 4. The structure refinement converged to R = 0.086. The molecular structure of the complex consists of linear chains made up by gadolinium(II1) ions bridged by nitronyl nitroxide radicals. The magnetic properties of this compound and of other structurally strictly related lanthanide nitronyl nitroxide complexes are discussed according to a model in which the next-nearest-neighbor interactions are explicitly taken into account. For appropriate values of the exchange parameters the ground state corresponds to a two-spins-up, two-spins-down configuration, which justifies the low effective magnetic moment observed at low temperatureFile | Dimensione | Formato | |
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