کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1311086 975279 2011 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Synthesis, characterization and catalytic activity of Salen–(sodium)2 and (Salen)2–lanthanum–sodium complexes
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی معدنی
پیش نمایش صفحه اول مقاله
Synthesis, characterization and catalytic activity of Salen–(sodium)2 and (Salen)2–lanthanum–sodium complexes
چکیده انگلیسی

Salen–Na2(1) and (Salen)2–La–Na(2) complexes have been prepared and structurally characterized [Salen = N,N′-bis (3,5-di-tert-butylsalicylidene)-1,3-propanediamine]. Experimental results show that the two complexes are efficient catalysts for the ring-opening polymerization (ROP) of l-lactide. According to the data of 1H NMR and electrospray-ionization (+ESI) mass spectrum, it is suggested that the obtained polymer is mainly cyclic polylactide (PLA) for a short PLA chain, but a mixture of cyclic and linear PLA for a long PLA chain. Structure–activity analysis of the two complexes is also done. We investigated why Salen–Na2 complex is more active (Salen)2–La–Na complex as the catalyst in the ROP of l-lactide and why the PLA catalyzed by complex 2 has lower PDIs than that catalyzed by complex 1.

Salen–Na2 and (Salen)2–La–Na complexes have been prepared [Salen = N,N′-bis (3,5-di-tert-butylsalicylidene)-1,3-propanediamine]. Their catalytic activity for the ring-opening polymerization (ROP) of l-lactide has been studied.Figure optionsDownload as PowerPoint slideHighlights
► Salen–Na2 and (Salen)2–La–Na complexes have been prepared and structurally characterized.
► The two complexes are the efficient catalyst for the ring-opening polymerization of l-lactide.
► Structure–activity analysis of the two complexes is also done.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Inorganica Chimica Acta - Volume 373, Issue 1, 15 July 2011, Pages 219–225
نویسندگان
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