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Title of article :
(Ferrocenylmethyl)trialkyl ammoniums as template cations in optically active two-dimensional oxalate bridged [Cr–Mn] and [Cr–Ni] molecule-based magnets: synthesis and magnetic properties
Author/Authors :
Bernard Malézieux، نويسنده , , Rom?n Andrés، نويسنده , , Muriel Brissard، نويسنده , , Michel Gruselle، نويسنده , , Cyrille Train، نويسنده , , Patrick Herson، نويسنده , , Ludmila L Troitskaya، نويسنده , , Viatcheslav I. Sokolov، نويسنده , , Svetlana T Ovseenko، نويسنده , , Tatiana V Demeschik، نويسنده , , Nikolay S Ovanesyan، نويسنده , , Irina A Mamedʹyarova، نويسنده ,
Issue Information :
دوفصلنامه با شماره پیاپی سال 2001
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Abstract :
A series of (ferrocenylmethyl)trialkyl ammoniums: FcCH2NR3+ with R=CH3 (1), C2H5 (2), n-C3H7 (3), n-C4H9 (4) (X-ray structure provided), n-C5H11 (5) and the planar chiral 1,2-disubstituted Fc(CH3)CH2NBu3+ (6) have been tentatively used as template cation in order to synthesise bidimensional (2D) oxalate bridged molecule-based magnets of general formula {[CrIIIMII(ox)3][FcCH2NR3]}n and{[CrIIIMII(ox)3][Fc(CH3)CH2NBu3]}n (M=Mn2+, Ni2+, ox=C2O42−). These polymeric compounds were obtained only for reactions performed with 2, 3, 4 and 6. Starting from resolved Cr(ox)32−, the networks were prepared in their two enantiomeric forms in the case of {[CrIIINiII(ox)3][FcCH2NBu3]}n ([CrΔ–NiΛ]-4 and [CrΛ–NiΔ]-4) or {[CrIIIMnII(ox)3][FcCH2NBu3]}n ([CrΔ–MnΛ]-4 and [CrΛ–MnΔ]-4)) and characterised by circular dichroism measurements. All these compounds are ferromagnets with a Curie temperature close to 6 K when M=Mn and to 17 K for Ni. While the manganese [Cr–Mn] containing compounds are soft magnets, the [Cr–Ni] networks show coercive force up to 2200 Oe far above those previously reported for these networks.
Keywords :
Ferrocenyl , Chirality , Chromium , circular dichroism , Molecule-based magnet , Oxalate bridge
Journal title :
Journal of Organometallic Chemistry
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