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Goura, Joydeb; Brambleby, Jamie; Topping, Craig V.; Goddard, Paul; Narayanan, Ramakirushnan Suriya; Bar, Arun Kumar; Chandrasekhar, Vadapalli
Publisher: Department of Physics, University of Warwick
Languages: English
Types: Other
Subjects: QC, QD
Sequential reaction of a multi-site compartmental ligand,2-methoxy-6-[{2-(2-hydroxyethylamino)ethylimino}methyl] phenol (LH3) with lanthanide(III) salts followed by the addition of Co(OAc)2·4H2O, in a 1:1:2 ratio, in the presence of tetramethylammonium hydroxide as the base, afforded heterobimetallic, trinuclear complexes [CoIII2Ln(L)2(μ-O2CCH3)2(H2O)3].NO3.2MeOH.4H2O [Ln = GdIII (1), TbIII (2), HoIII (3) and ErIII (4)]. All the complexes are mono cationic and contain nitrate counter anions. The metallic core of these complexes possess a (CoIII-LnIII-CoIII) motif which possesses a bent geometry; the central LnIII ion is connected to the two terminal CoIII ions through two phenoxide groups, two [N-CH2CH2O]- ligands and twobridging acetate ligands. This bridging coordination of the various ligands generates two contiguous CoLnO2 4-membered rings that are connected at the LnIII center. The terminal CoIII ions are six-coordinated (2N, 4O) in a distorted octahedral geometry, while the central lanthanide ion is nine coordinated (9O) in a distorted mono capped square-antiprismatic geometry. The magnetic properties of the complexes reveal that erbium and terbium analogues shows field-induced single-ion magnetic behaviour. The energy barrier for the reversal of the magnetization of CoIII2TbIII analogue is Ueff≥15.6(4) K while the CoIII2ErIII analogue Ueff≥9.9(8) K.
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