DEY, Atanu; DAS, Sourav; KUNDU, Subrata; MONDAL, Abhishake; ROUZIÈRES, Mathieu; MATHONIÈRE, Corine; CLÉRAC, Rodolphe; SURIYA NARAYANAN, Ramakirushnan; CHANDRASEKHAR, Vadapalli

doi:10.1021/acs.inorgchem.7b02450

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DEY, Atanu
Department of Chemistry [Kanpur] [IIT Kanpur]
TIFR Centre for Interdisciplinary Sciences [Hyderabad] [TCIS]

DAS, Sourav
Department of Chemistry [Kanpur] [IIT Kanpur]
Department of Chemistry

KUNDU, Subrata
Department of Chemistry [Kanpur] [IIT Kanpur]

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Inorganic Chemistry. 2017-11-16, vol. 56, n° 23, p. 14612-14623

American Chemical Society

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The reaction of a multisite coordination ligand, LH3, with Cu(II) salts and Ln(NO3)3·nH2O in a 1:2:1 stoichiometric ratio in the presence of triethylamine was found to afford a series of one-dimensional heterometallic [{Cu5Ln2(L)2(μ3-OH)4(ClO4)(NO3)3(OH2)5}(ClO4)2(H2O)x]∞ [Ln = Tb(1), Dy(2) and Ho(3), x = 4.25, 5.5, and 5 for 1-3, respectively] coordination polymers. Complexes 1-3 have been characterized by single crystal X-ray crystallography. The detailed study of the magnetic properties has also been performed and compared with the parent [Cu5Ln2] molecular analogues. The ac susceptibility measurements for complexes 1-3 confirm their SMM behavior with the following characteristics: Δeff/kB = 23.4 K, τ0 = 1.1 × 10-6 s and Δeff/kB = 27.9 K, τ0 = 6.6 × 10-7 s under 0 and 1200 Oe dc fields, respectively for 1; Δeff/kB = 8.3 K, τ0 = 3.1 × 10-6 s for 2 under 0 dc field. For 3, the fast QTM below 4 K prevents the estimation of the SMM energy barrier. Remarkably, the magnetic and SMM properties of the previously reported molecular [Cu5Ln2] analogues are preserved after their assembly in these coordination networks.< Réduire

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Heterometallic heptanuclear [Cu5Ln2] (Ln = Tb, Dy, and Ho) single-molecule magnets organized in one-dimensional coordination polymeric network

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