Binuclear Aluminum Complexes Supported by Linked Bis(<italic style="font-style: italic">β</italic>-diketiminate) Ligands for Ring-Opening Polymerization of Cyclic Esters

Shaogang Gong; Peng Du; Haiyan Ma

doi:10.1007/s10118-018-2053-7

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Binuclear Aluminum Complexes Supported by Linked Bis(β-diketiminate) Ligands for Ring-Opening Polymerization of Cyclic Esters

Articles | Updated：2021-02-18

- Binuclear Aluminum Complexes Supported by Linked Bis(β-diketiminate) Ligands for Ring-Opening Polymerization of Cyclic Esters
- Chinese Journal of Polymer Science Vol. 36, Issue 2, Pages: 190-201(2018)
- Affiliations：
  
  Shanghai Key Laboratory of Functional Materials Chemistry and Laboratory of Organometallic Chemistry, School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai 200237, China
- Author bio：
  
  Haiyan Ma, E-mail haiyanma@ecust.edu.cn
- Funds：
- DOI：10.1007/s10118-018-2053-7
  CLC：
- Received：01 September 2017，
  
  Accepted：30 September 2017，
  
  Online First：21 November 2017，
  
  Published：05 February 2018
- Accepted：
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Shaogang Gong, Peng Du, Haiyan Ma. Binuclear Aluminum Complexes Supported by Linked Bis(β-diketiminate) Ligands for Ring-Opening Polymerization of Cyclic Esters[J]. Chinese Journal of Polymer Science, 2018, 36(2): 190-201. DOI: 10.1007/s10118-018-2053-7.
DOI：

Shaogang Gong, Peng Du, Haiyan Ma. Binuclear Aluminum Complexes Supported by Linked Bis(β-diketiminate) Ligands for Ring-Opening Polymerization of Cyclic Esters[J]. Chinese Journal of Polymer Science, 2018, 36(2): 190-201. DOI: 10.1007/s10118-018-2053-7. DOI：

摘要

Abstract

Binuclear aluminum alkyl complexes

2a-4g

supported by linked bis(

-diketiminate) ligands were synthesized

via

the reaction of AlEt

or AlMe

and the corresponding proligand in a 2:1 molar ratio with moderate yields. The isolated complexes were well-characterized by

H-NMR

C-NMR and elemental analysis. The binuclear nature of aluminum complex

was further confirmed by an X-ray diffraction study. All complexes

2a-4g

could efficiently initiate the ring-opening polymerization (ROP) of ε-caprolactone in toluene. The substituents at the aromatic rings and the linker unit in the auxiliary ligands exerted significant influence on the catalytic behavior of the investigated aluminum complexes. Complex

=Cl) containing propylenyl bridging unit exhibited the highest catalytic activity among these complexes

which might be attributed to the increased electrophilicity of the metal center as well as more opened coordination sphere. The molecular weights of obtained poly(

-caprolactone)s deviating considerably from the theoretical values indicated that the ROP of

-caprolactone by complexes

2a-4g

was not well-controlled

which was also judged from the broad molecular weight distributions (MWD=1.47-2.47) of produced poly(

-caprolactone)s. These complexes proved to be inactive toward the polymerization of

rac

-lactide alone. In the presence of alcohol the polymerization occurred

which was actually initiated by the decomposition species of the aluminum complex upon the treatment with isopropanol.

关键词

Keywords

references

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Binuclear Aluminum Complexes Supported by Linked Bis(β-diketiminate) Ligands for Ring-Opening Polymerization of Cyclic Esters

DOI：10.1007/s10118-018-2053-7

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