Citation: Min ZHANG, Jiang-Hua SUN, Wei-Lin SUN, Xu-Feng NI. Synthesis and Characterization of Dinuclear Rare Earth Complexes Bearing N-heterocyclic Olefin Moieties[J]. Chinese Journal of Structural Chemistry, ;2020, 39(1): 79-85. doi: 10.14102/j.cnki.0254-5861.2011-2367 shu

Synthesis and Characterization of Dinuclear Rare Earth Complexes Bearing N-heterocyclic Olefin Moieties

Min ZHANG ^{a, b} ,
Jiang-Hua SUN ^b ,
Wei-Lin SUN ^a ,
Xu-Feng NI ^a,,

a.
MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, China
b.
Hangzhou Huasu Industry Co., Ltd., Hangzhou 310012, China

Corresponding author: Xu-Feng NI, xufengni@zju.edu.cn
Received Date: 13 March 2019
Accepted Date: 10 May 2019

Figures(3)

The oxygen-bridged dinuclear rare earth complexes (Ln = Nd (1), Y (2)) bearing N-heterocyclic olefin moieties were synthesized by treating the imidazolidinium salt [SIMes-H]Br with potassium amide and rare earth bis(trimethylsilyl)amides. Complex 1 was characterized by X-ray diffraction analysis and complex 2 was characterized by ¹H NMR spectroscopy. Both complexes were characterized by elemental analysis. Crystal data of complex 1: C₇₄H₁₃₈O₂N₈Si₈Nd₂, M_r = 1685.12, orthorhombic, space group Pbca, a = 25.1105(7), b = 11.9188(2), c = 29.6151(7) Å, V = 8863.4(4) Å³, Z = 4, D_c = 1.263 g·cm^-3, μ = 1.311 mm^-1, F(000) = 3544, the final R = 0.0418 and wR = 0.0770 for all data. The ring-opening of tetrahydrofuran molecule was proven, the possible mechanism for the formation of N-heterocyclic olefin (NHO)-rare earth complexes was speculated and the electronic and steric properties of SIMes and rare earth amides were discussed. This work provides a better understanding of N-heterocyclic carbene rare earth chemistry.
- rare earth complex,
- N-heterocyclic olefin,
- N-heterocyclic carbene,
- SIMes,
- steric effect,
- DOI: 10.14102/j.cnki.0254-5861.2011-2367
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