Structural aspects and ring opening polymerization of ε-caprolactone using mono- and di-aluminum compounds incorporating bidentate pyrrole-morpholine ligands

Hung Chang Hsiao, Amitabha Datta, Yun Fan Chen, Weilun Chang, Ting Yu Lee, Chia Her Lin, Jui Hsien Huang

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A series of Al-compounds incorporating the bidentate pyrrole-morpholine precursor C4H3NH [2-CH2N(CH2CH2)2O] (1) and aluminum-alkyl have been conveniently synthesized and characterized by 1H and 13C NMR spectroscopy. Reacting one or two equivalents of 1 with AlMe3 in toluene afforded AlMe2{C4H3N [2-CH2N(CH2CH2)2O]} (2) and AlMe{C4H3N [2-CH2N(CH2CH2)2O]}2 (3), respectively, in moderate yield. Furthermore, compound (4), AlMe2{C4H3N [2-CH2N(CH2CH2)2O]}·AlMe3, was acquired either by the combination of 2 and one equivalent of AlMe3 or directly from the reaction between 1 and two equivalents of AlMe3. The molecular structures of 1, 2, and 4, were determined by single crystal X-ray diffractometry in solid state, showing a distorted tetrahedral arrangement around the Al atom in 2 and 4. All the aluminum compounds could effectively initiate the ring-opening polymerization (ROP) of ε-caprolactone in a well-controlled manner with molecular weight distributions (PDI = 1.03-1.49).

Original languageEnglish
Pages (from-to)35-41
Number of pages7
JournalJournal of Organometallic Chemistry
Publication statusPublished - 2016 Feb 15


All Science Journal Classification (ASJC) codes

  • Biochemistry
  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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