Lanthanum Bis(amidinate) Amido Complex {2-[Ph2Р(O)]C6H4NC(But)N(2,6-Me2C6H3)}2LaN(SiMe3)2: Synthesis, Structure, and Catalytic Activity in Ring-Opening Polymerization of rac-Lactide and ε-Caprolactone

IF 1.1 3区化学 Q4 CHEMISTRY, INORGANIC & NUCLEAR

Russian Journal of Coordination Chemistry Pub Date : 2025-07-02 DOI:10.1134/S107032842560041X

A. O. Tolpygin, A. V. Cherkasov, G. K. Fukin, A. A. Trifonov

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引用次数: 0

Abstract

The La(III) bis(amidinate) amido complex {2-[Ph₂Р(O)]C₆H₄NC(Bu^t)N(2,6-Me₂C₆H₃)}₂LaN(SiMe₃)₂ (I) was synthesized by the reaction of 2-[Ph₂Р(O)]C₆H₄NHC(Bu^t)=N(2,6-Me₂C₆H₃) (HL) and La[N(SiMe₃)₂]₃ in 2 : 1 molar ratio and isolated in 74% yield. X-ray analysis revealed that in I both monoanionic amidinate ligands are κ³-N,N,O-coordinated to La(III) ion. Complex I demonstrates high catalytic activity in ring-opening polymerization of cyclic esters and enables 100% conversion of 100–300 equiv of rac-lactide in 30 min or 100–500 equiv of ε-caprolactone in 1 min providing highly controlled polymerization. The obtained polymeric samples feature linear dependence of molecular weight vs. the monomer loading and rather narrow polydispersity (M_w/M_n = 1.36–1.88).

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双（氨基酸）氨基配合物{2-[Ph2Р(O)]C6H4NC(But)N(2,6- me2c6h3)}2LaN(SiMe3)2: racc -丙交酯和ε-己内酯开环聚合的合成、结构和催化活性

以2-[Ph2Р(O)]C6H4NHC(But)=N(2,6- me2c6h3) （HL）和La[N(SiMe3)2]3为原料，以2:1的摩尔比合成了La（III）双（氨基）氨基配合物{2-[Ph2Р(O)]C6H4NC(But)N(2,6- me2c6h3)}2LaN(SiMe3)2 (I)，分离率为74%。x射线分析表明，在I中，两种单阴离子氨基酸配体均与La（III）离子配位为κ3-N，N, o。配合物I在环酯开环聚合中表现出很高的催化活性，可以在30分钟内100%转化100-300当量的丙交酯或在1分钟内100%转化100-500当量的ε-己内酯，提供高度可控的聚合。所得聚合物样品的分子量与单体负载呈线性关系，且多分散性较窄（Mw/Mn = 1.36-1.88）。

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来源期刊

Russian Journal of Coordination Chemistry 化学-无机化学与核化学

CiteScore

2.40

自引率

15.80%

发文量

审稿时长

7.2 months

期刊介绍： Russian Journal of Coordination Chemistry is a journal that publishes reviews, original papers, and short communications on all aspects of theoretical and experimental coordination chemistry. Modern coordination chemistry is an interdisciplinary science that makes a bridge between inorganic, organic, physical, analytical, and biological chemistry.