Two compounds of formula Mn(pfpr),(NITMe) (I) and [Mn(pfpr)2]2(NITMe)(IMHMe) (11), respectively, where pfpr = pentafluoropropionate, NlTMe = 2,4,4,5,5-pentamethyI-4,5-dihydr1o I-f -imidazolyl-I-oxy1 3-oxide, and IMHMe = 2,4,4,5,5-pentamethyl- 4,5-dihydroimidazole3 -oxide, have been synthesized. The latter crystallizes in the monoclinic E , / c s pace group with u = 13.898 (3) A, b = 19.089 (4) A, c = 7.867 (3) A, @=94 .90 (2)’, R = 0.052, and Z = 4. The structure consists of manganese carboxylate chains that have as additional bridging ligands NITMe and lMHMe molecules randomly distributed along the chains. Hydrogen bonds between neighboring pairs of NITMe and lMHMe molecules connect the chains in puckered planes perpendicular to a. The magnetic properties of [ Mn(pfpr)2]2(NlTMe)(IMHMe) are consistent with a random-exchange one-dimensional model, while those of Mn(pfpr),(NITMe) indicate a two-dimensional system with antiferromagnetic interactions between ferrimagnetic chains. The magnetic properties suggest that the crystal structure of I is similar to that of I1 with the hydrogen bonds replaced by longer contacts between noncoordinated NO groups of the radicals.

Structure and magnetic properties of manganese(II) carboxylate chains with nitronyl nitroxides and their reduced amidino-oxide derivatives. From random-exchange one-dimensional to two-dimensional magnetic materials / Caneschi, Andrea; Gatteschi, Dante; Maria Chiara Melandri, ; Paul, Rey; Sessoli, Roberta. - In: INORGANIC CHEMISTRY. - ISSN 0020-1669. - STAMPA. - 29:(1990), pp. 4228-4234. [10.1021/ic00346a014]

Structure and magnetic properties of manganese(II) carboxylate chains with nitronyl nitroxides and their reduced amidino-oxide derivatives. From random-exchange one-dimensional to two-dimensional magnetic materials

CANESCHI, ANDREA;GATTESCHI, DANTE;SESSOLI, ROBERTA
1990

Abstract

Two compounds of formula Mn(pfpr),(NITMe) (I) and [Mn(pfpr)2]2(NITMe)(IMHMe) (11), respectively, where pfpr = pentafluoropropionate, NlTMe = 2,4,4,5,5-pentamethyI-4,5-dihydr1o I-f -imidazolyl-I-oxy1 3-oxide, and IMHMe = 2,4,4,5,5-pentamethyl- 4,5-dihydroimidazole3 -oxide, have been synthesized. The latter crystallizes in the monoclinic E , / c s pace group with u = 13.898 (3) A, b = 19.089 (4) A, c = 7.867 (3) A, @=94 .90 (2)’, R = 0.052, and Z = 4. The structure consists of manganese carboxylate chains that have as additional bridging ligands NITMe and lMHMe molecules randomly distributed along the chains. Hydrogen bonds between neighboring pairs of NITMe and lMHMe molecules connect the chains in puckered planes perpendicular to a. The magnetic properties of [ Mn(pfpr)2]2(NlTMe)(IMHMe) are consistent with a random-exchange one-dimensional model, while those of Mn(pfpr),(NITMe) indicate a two-dimensional system with antiferromagnetic interactions between ferrimagnetic chains. The magnetic properties suggest that the crystal structure of I is similar to that of I1 with the hydrogen bonds replaced by longer contacts between noncoordinated NO groups of the radicals.
1990
29
4228
4234
Caneschi, Andrea; Gatteschi, Dante; Maria Chiara Melandri, ; Paul, Rey; Sessoli, Roberta
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Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/647818
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