Molecular Magnets Based on Homometallic Hexanuclear Lanthanide(III) Complexes

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• 作者：Sourav Das ; Sakiat Hossain ; Atanu Dey ; Sourav Biswas ; Jean-Pascal Sutter ; Vadapalli Chandrasekhar
• 刊名：Inorganic Chemistry
• 出版年：2014
• 出版时间：May 19, 2014
• 年：2014
• 卷：53
• 期：10
• 页码：5020-5028
• 全文大小：505K
• 年卷期：v.53,no.10(May 19, 2014)
• ISSN：1520-510X

文摘

The reaction of lanthanide(III) chloride salts (Gd(III), Dy(III), Tb(III), and Ho(III)) with the hetero donor chelating ligand N鈥?(2-hydroxy-3-methoxybenzylidene)-6-(hydroxymethyl)picolinohydrazide (LH₃) in the presence of triethylamine afforded the hexanuclear Ln(III) complexes [{Ln₆(L)₂(LH)₂}(渭₃-OH)₄][MeOH]_p[H₂O]_q[Cl]₄路xH₂O路yCH₃OH (1, Ln = Gd(III), p = 4, q = 4, x = 8, y = 2; 2, Ln = Dy(III), p = 2, q = 6, x = 8, y = 4; 3, Ln = Tb(III), p = 2, q = 6, x = 10, y = 4; 4, Ln = Ho(III), p = 2, q = 6, x = 10, y = 2). X-ray diffraction studies revealed that these compounds possess a hexanuclear [Ln₆(OH)₄]¹⁴⁺ core consisting of four fused [Ln₃(OH)]⁸⁺ subunits. Both static (dc) and dynamic (ac) magnetic properties of 1鈥?b>4 have been studied. Single-molecule magnetic behavior has been observed in compound 2 with an effective energy barrier and relaxation time pre-exponential parameters of 螖/k_B = 46.2 K and 蟿₀ = 2.85 脳 10^鈥? s, respectively.