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Updated: Mar 3, 2026

Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
Published on: February 7, 2017
An amidato divalent ytterbium cluster: synthesis and molecular structure, its reactivity to carbodiimides and
Chao Gong1, Hao Ding, Chengrong Lu
1College of Chemistry, Chemical Engineering and Materials Science, Dushu Lake Campus, Soochow University, Key Laboratory of Organic Synthesis of Jiangsu Province, Suzhou 215123, People's Republic of China. zhaobei@suda.edu.cn yaoym@suda.edu.cn.
Abstract:
A divalent ytterbium amidate 1 ([Yb3L6]·2C7H8 for short) was synthesized via amine-elimination of Yb[N(SiMe3)2]2(TMEDA) with an amide proligand N-2,6-diisopropylphenylbenzamide HL (L = 2,6-iPr2C6H3NC(O)Ph) and structurally characterized to be a trinuclear symmetric cluster. Further studies on the reduction of iPrN[double bond, length as m-dash]C[double bond, length as m-dash]NiPr by complex 1 provide Yb(iii) complex 2 in hexane-THF ([(YbL2)2(μ-NiPrCNiPr)][YbL3(THF)]·C7H8), which is composed of two subunits in a unit cell, one is a bridged Yb(iii) carbene, just the same as complex 4 ([(YbL2)2(μ-NiPrCNiPr)]·3C7H8) obtained in the same reaction in toluene, and the other is a homoleptic monomeric Yb(iii) amidate (YbL3). It is also found that complex 2 decomposed to complex 3 ([YbL3]2·2C7H8) and 4 at 90 °C in toluene. Complexes 1-4 were confirmed by X-ray structure determination. Furthermore, complex 4 was proved to be a more active species than its precursor 1 in the catalytic addition of amines to carbodiimides. Finally, complex 1 was found to be an excellent pre-catalyst for the guanylation reaction with a wide scope of substrates.
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