Das Sourav, Hossain Sakiat, Dey Atanu, Biswas Sourav, Sutter Jean-Pascal, Chandrasekhar Vadapalli
Department of Chemistry, Indian Institute of Technology Kanpur , Kanpur-208016, India.
Inorg Chem. 2014 May 19;53(10):5020-8. doi: 10.1021/ic500052v. Epub 2014 Apr 25.
The reaction of lanthanide(III) chloride salts (Gd(III), Dy(III), Tb(III), and Ho(III)) with the hetero donor chelating ligand N'-(2-hydroxy-3-methoxybenzylidene)-6-(hydroxymethyl)picolinohydrazide (LH3) in the presence of triethylamine afforded the hexanuclear Ln(III) complexes [{Ln6(L)2(LH)2}(μ3-OH)4][MeOH]p[H2O]q[Cl]4·xH2O·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 core consisting of four fused Ln3(OH) subunits. Both static (dc) and dynamic (ac) magnetic properties of 1-4 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 Δ/kB = 46.2 K and τ0 = 2.85 × 10(-7) s, respectively.
在三乙胺存在的情况下，镧系元素（III）氯化物盐（钆（III）、镝（III）、铽（III）和钬（III））与杂原子供体螯合配体N'-（2-羟基-3-甲氧基亚苄基）-6-（羟甲基）吡啶酰肼（LH3）反应，得到六核镧系元素（III）配合物[{Ln6（L）2（LH）2}（μ3-OH）4][MeOH]p[H2O]q[Cl]4·xH2O·yCH3OH（1，Ln = 钆（III），p = 4，q = 4，x = 8，y = 2；2，Ln = 镝（III），p = 2，q = 6，x = 8，y = 4；3，Ln = 铽（III），p = 2，q = 6，x = 10，y = 4；4，Ln = 钬（III），p = 2，q = 6，x = 10，y = 2）。X射线衍射研究表明，这些化合物具有由四个稠合的Ln3（OH）亚基组成的六核Ln6（OH）4核心。对1-4的静态（直流）和动态（交流）磁性进行了研究。在化合物2中观察到单分子磁行为，其有效能垒和弛豫时间预指数参数分别为Δ/kB = 46.2 K和τ = = 2.85 × 10(-7) s。
